Dissertations / Theses on the topic 'SensorART'
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VERDE, ALESSANDRO. "Dal Progetto Europeo SensorArt all’attività di ricerca clinica: focus sui pazienti in assistenza ventricolare meccanica." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2016. http://hdl.handle.net/10281/132656.
Full textKarlsson, Daniel, and Jesper Eriksson. "Uppkopplade Sensorer." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-67720.
Full textInternet of Things is becoming more common in the home. In recent years, the availability of connected devices that help automate parts of the home has increased. Connected sensors are part of this and they offer monitoring of, for example, temperature, humidity, motion and light. By presenting measurment values from sensors via a graphical interface, you have the option to act — manually or automatically – on these values, to for example, adjust the temperature in good time. The aim of this report is to develop an IoT product as a sensor network to collect data from sensors connected to the single board computer Raspberry Pi. The purpose is to create a scalable system with a modular design. Two Raspberry Pi were used to develop an IoT system where a device collects measu- rement values from sensors and another device which exposes a REST API that enables communication through the HTTP-protocol to send and recieve data. Measurment values are stored in a database and the latest measurement values are presented in a grahpical user interface. The result is a sensor network with a modular design that can be used to collect humi- dity and temperature values in the enviroment. These values are presented in a graphical user interface.
Bohman, Johan. "Sensorer i brownout." Thesis, Försvarshögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-4024.
Full textWhen a helicopter is in brownout the crew looses references to the world outside which could decrease the spatial awareness. If the crew does not know the accurate position of the helicopter it can lead to damage on both equipment and crew when landing. This report examined, on a general level, how sensors within the electromagnetic spectrum could contribute with information to the spatial awareness. The report found that the sensors need to be adaptable due to the widely varying characteristics of the dustcloud. The sensors were able to generate an image of the landingsite prior to brownout. Radar was best suited to updating the image when brownout had occurred, whereas the electro-optical sensors are highly attenuated by the dust cloud. However, the electro-optical sensors generated an image of the environment corresponding to the eye's interpretation of the same surrounding, something that a radar has greater difficulty with accomplishing.
Degirmenci, Cecilia, and Hamed Alsakban. "Laborationer med trådlösa sensornät." Thesis, Malmö högskola, Teknik och samhälle, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20011.
Full textWireless sensor networks, WSN, is a rapidly growing field of technology with many applications. A typical WSN consists of many small, inexpensive and energy-saving devices, called sensor nodes. These nodes measure an environmental parameter and the radio sends a data packet with the measured value to a base station, which is often connected to a PC. The information can then be analyzed and presented graphically to the user. A sensor network's size can vary from a few nodes in a small area to a network with thousands of nodes that covers several square kilometers of area. A section on wireless sensor networks is part of the course in Computer and telecommunication technologies II, DA122T, at Malmö University. This thesis reports on the development of study material for the practical laboratory motes on sensor networks for the course. The equipment used in the practical experiments is a package containing six sensor nodes, a base station and the necessary software. The manufacturers are Crossbow Technology, the world's leading company of WSN products. The results of the work are two practical exercises, a description of the equipment used in practical experiments and a report – Introduction to WSN. These guides and other materials are written in Swedish. The first lab in which to build a simple WSN, gives students an understanding of the principle of wireless sensor networks and how the hardware and software interacts with each other. In the second exercise, students will learn to program the sensor nodes to study the communication between the nodes and the base station and to explore the different network topologies.
Najar, salwan. "Simulering av 1-Wire sensorer." Thesis, KTH, Skolan för teknik och hälsa (STH), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104086.
Full textHjelmberg, Eric, and Henrik Rowell. "Persondetektering i inomhusmiljö med enkla sensorer." Thesis, Linköpings universitet, Datorteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122908.
Full textLjungberg, Andreas. "Mätningssystem för inbyggda sensorer i hälsoteknik." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-32242.
Full textMedical personnel have been using a Go/No-Go test, as a tool to diagnose ADHD (Attention Deficit Hyperactivity Disorder) in patients. Such tests use a set of sequential patterns with different colored spheres where the patient is supposed to click on a button when a specific colour appears on the screen. A camera is used to track the patient’s movements during the test. The problem with such tests is that multiple, individual test and evaluations runs are required to distinguish people with ADHD from those without ADHD. This thesis is focused on finding out how and if it’s useful to add additional embedded sensors and better analysis software in order to improve, shorten and simplify the current evaluation procedures.A background study has been conducted to obtain strong grounds for the implementation of a new analysis software. A prototype of the software was tested with various sensors to enable psychologists to evaluate if this software would be beneficial for their evaluation process. This background study also contributed with theoretical results, showing that adding additional sensory devices as well as the new analysis software would be useful.Both the theoretical results and user tests indicated a strong basis that more sensors and better software will contribute to shorter diagnosis evaluations for patients with ADHD.
Alrashid, Ivan. "Ljudhändelsedetektor med distribueradeLoRa-anslutna akustiska sensorer." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174830.
Full textDetecting noise levels explains a lot in urban areas such as noise levels, number of shots, and number of collisions. In this project, a sound detector is installed that communicates via LoRa, Long Range when the sound exceeds a threshold value. The sound detector is implemented as a stand-alone module consisting of three existing modules. The modules used in the project include Lopy4 with Expansion Card 3.1, GPS module, and Sound sensor. The sound level, battery level, coordinates, date, and time are transferred via LoRa to a gateway and on to The Thing of Network, TTN website, and at the same time data is saved locally in an SD memory card when the sound exceeds a threshold. The threshold can be modified according to the user's wishes.
Nygård, Skalman Jonas. "Molnkopplade koldioxid sensorer : Prototypkonstruktion och strömmätningar." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-30979.
Full textEriksen, Oddbjørn. "High-frequency pressure measurements in the refining zone of a high-consistency refiner." Doctoral thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-916.
Full textThis thesis is based on an experimental study of the pressure conditions in the refining zone of high-consistency refiners used in paper making. The work presents the findings from two different mill-scale experiments in addition to results obtained from a pilot refiner study. The experiments have been performed using two different types of pressure sensors:
• Fibre-optic pressure sensors based on extrinsic Fabry Perot interferometer (EFPI).
• Piezoresistive temperature and pressure transducers.
This study has shown that it is possible to establish high-frequency pressure measurements in the refining zone of high-consistency refiners. Data have been collected at rates up to 20 million samples per second. The fibre-optic sensors seem to be preferable to the piezoresistive transducers as the fibre-optic sensors were working well after long exposure to the harsh environment inside the refining zone. Reliable measurements were still obtained after 1000 operating hours. On the other hand, the piezoresistive sensors suffered from problems caused by the wet environment inside the refiner as well as from the electrical dependent circuits and transmission cables. However, in the pilot refiner under less harsh environment, the piezoresistive transducer functioned well.
The main focus in this thesis has been related to the second mill-scale experiment which used fibre-optic pressure sensors. The results obtained from this experiment are considered to be more valuable than those from the first mill-scale experiment which used combined piezoresistive pressure and temperature transducers. Furthermore, pulp samples were collected during the second mill-scale experiment allowing an even more comprehensive analysis. However, the results from the first mill-scale experiment are shown as a comparison and in order to demonstrate the challenge of selecting the appropriate technology. Results from a successfully test performed in the pilot refiner, which also used a combined piezoresistive pressure and temperature transducer, are shown as well. In addition, as a supplement to the results from the mill-scale experiment with fibre-optic sensors, an experiment which employed external accelerometers for measuring the high-frequency vibrations in the mill refiner is discussed. Another supplement was made through an experiment measuring the deviation of the rotational speed of the refiner shaft.
The main objective of this study has been to find out how to make high-frequency pressure measurements in the refining zone of a mill-scale high-consistency TMP refiner. The study has particularly focused on the signal analyses and the reliability of the pressure measurements. Since the investigations have been focused on the experimental issues, assessments are primarily made regarding the recorded data and the related process observations.
One of the challenges was to find suitable technology for use in a harsh environment. Obtaining and selecting an appropriate sensor was extremely important. A fast responding sensor was prerequisite. It was of particular interest to investigate the pressure pulses generated from the squeezing of wood particles between the sensor surface and the bars on the opposite disc. In addition, the dimension of the sensor surface had to be small so that the peak pressures could be determined. The size should preferably be smaller than a width of a bar. Especially the fibre-optic sensors met this criterion as they had a surface diameter of approximately 1 mm. The piezoresistive sensors had a surface diameter of 3.8 mm.
Mill-scale experiments were conducted to test the sensors in a realistic environment. The design of the experiments was important in the assessment of the performance of the sensors during different controlled conditions. Collecting of pulp samples to assess the pulp quality of the primary refining in comparison to the process behaviour and the pressure signals were matters of additional interest.
The analyses of the experiment should give conclusions about the reliability of the sensors. A goal of the present work has also been to examine the behaviour and the properties of the pressure signals, and investigate the origin of the pressure pulses. Most of the results are from high-frequency measurements of pressure in the refining zone of a high-consistency TMP refiner. Combined temperature and pressure measurements are shown from the test in the pilot refiner. The fast development within sensor and computer technology has made it possible to achieve measurements that have not been performed earlier. The use of fibre-optic sensor technology in chip refiners has not been reported earlier. The high-frequency recordings using sample rates of up to 20 MSamples/s suffered from the lack of demodulation technology such that the accuracy of the absolute pressure readings is limited. However, this study indicates average pressures between 20 and 30 bar in the intermediate zone.
Even more interesting is the fast pressure changes obtained using frequency analysis. Common frequencies indicating vibrations in the discs appearing from the pressure pulses when the pulp is squeezed between the bars of the stator and rotor disc have been observed. This observation was supported by vibration analysis using external accelerometers. It is claimed that there is a relationship between vibrations in the refiner discs and the pressure pulses that are generated from the squeezing of pulp between bars on the rotor and stator disc. However, nobody has investigated this particular relationship although this study strongly indicates that this relationship exists. Furthermore, it is shown that the pressure sensors were not affected by vibrations operating in resonance. This strongly supports the conclusion that the fibre-optic pressure sensors were solely measuring the activities in the refining zone.
The frequency analysis of the different recordings gave firm evidence of the process related influences of the pressure readings. The reliability of the performance of the sensors was clearly visible through this analysis technique. Several analyses found that the shift in the bar crossing frequencies was directly proportional to and caused by fluctuations in the rotational speed of the refiner. However, local bar crossing frequencies were generally not as clear as expected. The measurements indicated that some specific radial positions determined by the tapered plate pattern, dominated the responses. Among the most dominating frequencies were periodicities associated with the rotational speed of the refiner, the number of bars in the breaker bar and coarse zones as well as the transition zone between the intermediate and fine bar zones. When the plates were new, a 25.2 kHz periodicity that arose from a bar-to-bar passage in the fine bar zone dominated the pressure readings. These pulses probably propagated in the disc so that the whole disc vibrated. It is not assumed that these vibrations generated large plate gap variations. However, these fluctuations were predominant compared with the local generated pressure pulses. The pressure variations probably propagated through the steam and pulp pad as pressure waves. Thus the pulp and steam flow through the whole refining zone was affected. The local bar crossing frequencies were suppressed and only visible to a minor extent. It is conceivable that the steam and pulp interacts through a two-phase flow. Thus the steam may have a repressive effect on the interaction between the pulp pad and the bar patterns on the discs.
Recordings during different controlled operating conditions were used to study the reliability of the sensors. The relationship between the pressure signals and the process variables has been investigated as well. The most reliable relationship was obtained when changing the chip flow to the refining zone after 1000 hours of operating time. The motor load and acceleration variables were strongly correlated with the pressure readings. No strong correlations were found between the data from the pressure sensors and the process variables shortly after start-up using new plates. The pulp samples that were collected and analysed did not give a good relationship between the pressure signals and the quality data. However, during this period other process disturbances affected the conditions in the refining zone more than the randomized manipulation of the control variables. This was observed as time dependent variations in the pressure recordings as well as several process variables. The most probable disturbance was the amount of chips fed to the refiner and subsequent changes of the plate gap. Further indications imply that the pressure sensors were sensitive to variations in the incoming stream of chips. Besides the successful test when changing the chip flow to the refining zone, frequency analyses have showed that the sensors also were affected by periodicities in the pulp flow that were related to the inner part of the refining zone and the breaker bar section. This was shown both as sideband effects as well as plain peak frequencies. Sideband effects are interpreted as periodic waves of pulp flow propagated through the refining zone.
This study indicates that the average pressure in the intermediate zone of the refining zone of the mill-scale TMP refiner was as high as 20-30 bar. This was somewhat higher than expected from the theoretical considerations. However, the theoretical calculations have some limiting factors, which there are some disagreement in the literature. The area where the energy is applied in the refining zone as well as the tangential friction coefficient is not clearly determined. Both are included in one of the theoretical approaches. Thus there are some uncertainties associated with the models. However, some uncertainties are related to the determination of the pressure levels for the measurements using the fibre-optic sensors as well. This is mainly due to the lack of well-established demodulation techniques for the sinusoidal relation between the sensor signal and the pressure. This is the greatest weakness in this part of the investigation. The pressure levels obtained using the piezoresistive sensors were to some extent agreeable with the fibre-optic measurements. However, there was greater uncertainty in the piezoresistive measurements due to probable disturbances related to electromagnetic noise or moisture having a detrimental influence on electric circuits in the sensors. The most interesting results obtained using the piezoresistive sensors in the mill-scale experiment have been observations of process relevant periodic signal patterns. Stable average pressures between 2 and 4.5 bar were found in the atmospheric pilot refiner during normal operating conditions. Since the local bar crossing frequency did not dominate the periodicities obtained from these recordings it is assumed that the steam affected the pressure conditions in the refining zone. This is assumed despite the fact that the refiner was atmospheric. Pressure peaks above 10 bar were observed frequently. When the plate gap decreased, the pressure pulses were considerably higher. Pressure peaks up to 60 bar were observed during operation with a small plate clearance. The local bar crossing frequency was clearly visible under such conditions, not otherwise.
Johansson, Thomas. "Utvärdering av precisionen hos sensorer för tröghetsnavigering." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2575.
Full textRotundus AB är ett världsledande företag inom området för sfäriska robotar som håller på att utveckla den markbundna farkosten GroundBot(tm). För att detektera robotens translations- och rotationsrörelser används accelerometrar och hastighetsgyron. Dessutom används sensorerna för tröghetsnavigering när GPS-täckning saknas.
Målet med projektet innebär att ta fram en metod för att utvärdera precisionen hos sensorer för robotens tröghetsnavigeringsenhet. Metoden koncentrerar sig på fyra av sensorernas felkällor: Skalfaktor, bias, slumpvandring och biasinstabilitet.
För att beräkna skalfaktorn och biasen används linjära minsta kvadratmetoden där utsignalen från sensorn anpassas mot ett teoretiskt värde. Slumpvandringen och biasinstabiliteten utvärderas med Allans varians.
Malmlöf, Erik, and Ola Scholander. "Reglering av veka strukturer med multipla sensorer." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1640.
Full textIn this master thesis, control algoritms using arm side sensors are investigated for an industrial robot. The sensors can be position encoders placed after the gearbox and accelerometers on the robot arms. Control strategies are discussed and evaluated for different models of the robot, after which chosen strategies are applied to a realistic model.
Control algoritms using arm side sensors (LQ, dual-loop and PD-PID) are compared to a PID-controller that only uses measurements of motor position for feedback control. The comparison are done with respect to disturbance rejection, oscillation damping, robustness and tracking performance of a reference trajectory.
Results from tests with the realistic robot modell shows that disturbance rejection was improved a factor 2 to 5 while tracking performance was improved a factor 4 to 5 according to maximum deviation from the reference path. At the same time good re-sults are achieved regarding oscillation damping and robustness.
Walldén, Eric, and Daniel Peltoniemi. "Förbättringsarbete av en testrigg för elektromagnetiska sensorer." Thesis, Uppsala universitet, Industriell teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-452349.
Full textErasteel Kloster in Långshyttan is a steelwork that among other things hot rolls iron. The quality of the rolled iron is inspected by an electromagnetic sensor. This sensor is calibrated using a test rig and a test material with a defect. This test material is moved back and forth through the sensor, which gives different outputs depending on the fault. These outputs are then used to calibrate the sensor settings. This study aims to examine possible improvements of the currently used test rig as well as to develop a proposal for an improved rig. The current problems are identified from interviews and observations. Different concept ideas were developed, examined, and discussed with the companies wishes and the identified problems as a foundation. Different fitting components such as drive units and linear rails which can be purchased have been identified. Various improvement concepts were created based on the old test rig, while the identified problems and the wishes of Erasteel were taken into consideration. This work resulted in a new model of a test rig, made with Solidworks. The design is created with the concepts that satisfy the companies demands in the best way, which was evaluated with the Pugh concept matrix. The final proposal solves all identified problems which are associated with the old rig, while at the same time being more user friendly. This new rig will be the basis for the new machine which will be built at Erasteel.
Nieto, Peroy Victor. "Detektion av temperaturförändringar med hjälp av trådlösa sensornät." Thesis, KTH, Reglerteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107516.
Full textOlsson, Erik. "Utvärdering av Android-sensorer för tävlingssyfte med HiGTechs prototypfordon : En empirisk undersökning av relevanta inbyggda sensorer i en mobilapplikation." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-21801.
Full textOhlsson, Kristian, and Magnus Ödkvist. "Höjdmätningssystem : Analys av sensorer för höjdmätningssystem till truckar." Thesis, Linköping University, Department of Mechanical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6769.
Full textBT Products AB ingår i Toyota-koncernen och är världsledande inom trucktillverkning. BT har flera
dotterbolag i olika delar av världen som tillverkar truckar, t ex Raymond i USA. Några av de BTtillverkade
truckarna har ett höjdmätningssystem. Detta höjdmätningssystem är till för att underlätta
för föraren att positionera gafflarna i höjdled. Föraren måste aktivt ge styrsignal för att en höjdrörelse
skall tillåtas. Dagens system på BT: s RR truckar mäter endast huvudlyftet.
Syftet med examensarbetet är att undersöka konkurrentlösningar och befintliga system, studera
maskindirektiv och standarder samt att sätta sig in i höjdmätningssystemets användningsområde. I
examensarbetet ingår även att utreda lämpliga typer av sensorer som kan användas i befintliga
systemet eller i ett alternativt system. Denna lösning skall jämföras med det befintliga systemet som
har hög tillförlitlighet och har en rimlig kostnad. Slutligen skall lösningen testas på truck och
dokumentera lösningens fördelar och nackdelar.
Examensarbetet avgränsas till undersökningar, utvärderingar och tester av sensorer och möjliga sätt
att utföra höjdmätning på truck. Den valda lösningen kommer i detta arbete inte att installeras i
trucken utan endast utföras experimentellt. Alternativa lösningar till det valda höjdmätningssystemet
kommer ändå att presenteras.
De metoder som använts i examensarbetet är BT: s nyckel för riskanalys och delar av Hubkas
utvecklingsprocedur. Testutföranden är beskrivna i provjournaler och är bifogade i rapporten.
Examensarbetet är utfört på ett systematiskt sätt enligt teorier av Vladimir Hubkas och Mogens
Myrup Andreasens utvecklingsprocedur. Först gjordes en faktainsamling om givare, konkurrentlösningar
och det befintliga systemet. Därefter sammanställdes en kravspecifikation utifrån teorier från
Hubkas samt maskindirektiv för höjdmätningssystemet. Ett antal olika sätt att mäta lyfthöjden togs
fram för de olika givartyperna. Med hjälp av datummetoden jämfördes de olika givarna mot sensorlagret
från SKF i det befintliga höjdmätningssystemet. Utifrån resultatet av datummetoden rangordnades
givarna, och tillsammans med respektive mätsätt kunde de lämpligaste höjdmätningssystemen
fås fram. Med hänsyn till att bristerna i det befintliga systemet inte behandlades med
datummetoden omvärderades framtagna mätsystemen mot bristerna för det befintliga systemet.
Resultatet blev att mäta hela lyfthöjden på gaffelvagnen och att använda en och samma givare. De
båda valda alternativa givartyperna utsattes för undersökningar samt testades på truck. En del
svårigheter som kvarstår är inbyggnaden i stativet eller på gaffelvagnen. En lösning är att placera
draw-wiren i utskjutningsvagnen och leda ut wiren mellan stativpelarna. Wiren vinklas sedan upp i
stativet med hjälp av ett styrhjul och fästs i gaffelvagnen. Även om lasern medför ett bra säljargument
är en billig laser för långsam för att ingå i ett höjdförvalssystem. Dessutom klarar lasern
inte av miljötålighetskraven. Övriga mätsystem som inte mäter hela lyfthöjden ärver de brister som
det befintliga systemet har. Det andra i arbetet framtagna systemet med en draw-wire trumma är
dyrare än det befintliga.
Slutsatsen blir dock att om BT tar fram ett alternativt system för att mäta höjd bör man konstruera en
egen wire trumma samt integrera SKF: s sensorlager.
Gustafsson, Josefin, and David Andersson. "Detektering av föremål med hjälp av beröringsfria sensorer." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1364.
Full textUppgiften är att föreslå olika metoder på ett kollisionskydd som företaget Arcoma kan använda sig av. Skyddet skall i första hand kunna detektera en människa men om möjligt även döda föremål. Skyddet skall kunna sitta på Arcomas olika röntgenstativ och bord.
Ett utvärderingskort från Freescale undersöktes först. Kortet skapar ett elektromagnetiskt fält mellan valda utgångar och frågan är om man kan detektera ifall detta fält bryts av något föremål.
Eftersom utvecklingskortet inte fungerade bra riktades blickarna mot andra tänkbara lösningar. Den lösning som verkade mest gångbar var att använda sig utav kapacitiva sensorer. Ett testkort som kan drivas av röntgenutrustningens 24V matning konstruerades. Kortet jämför två stycken spänningsnivåer där den ena kommer från en fast likspänning och den andra ursprungligen kommer från en pulsgenerator. Pulsgeneratorn ger ifrån sig en fyrkantspuls på cirka fem kHz, efter pulsgeneratorn sitter en kapacitans bestående av två stycken metalliska ytor. Beroende på avståndet mellan sensorplattorna ökar eller minskar kapacitansen, om ett föremål närmar sig förändrar kondensatorns dielektrikum och en spänningsförändring fås. Efter sensorn förstärker en operationsförstärkare den låga spänningen. Nästa steg är att jämföra den fasta likspänningen med spänningen från sensorn. När ett föremål närmar sig sensorn sjunker spänningen och nivån blir lägre än den fasta likspänningen. Då detta händer ändras komparatorkretsens utspänning från 0 – 12V eller tvärtom beroende på insignalernas koppling till komparatorn. En lysdiod fungerade som spänningsindikator.
Efter en rad tester och demonstrationer verkade företaget mycket intresserade av att fortsätta arbeta med denna metod och kanske utveckla en ny produkt baserad på denna.
Garrido, Jorge. "Påverkan på elektronik och sensorer i radiologisk miljö." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159633.
Full textNilsson, Jesper. "Elektronisk krigföring mot sensorer i varnar- och motverkanssystem." Thesis, Försvarshögskolan, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-9840.
Full textDetta självständiga arbete på grundnivå inom ämnet försvarssystem behandlar möjligheter till aktiv radarstörning av varnar- och motverkanssystem (VMS), i syfte att erhålla verkan med befintliga burna pansarvärnssystem mot stridsfordon. Givet att aktiv radarstörning kan användas mot ett varnar- och motverkanssystem med förstörande motmedel; (1)Vilka möjligheter till verkan ger ett telekrigsystem med aktiv radarstörning i kombination med ett pansarvärnssystem?(2)Vilken typ av aktiv radarstörning är lämplig och vilken effekt på det störda systemet kan förväntas? Arbetet visar på effekten VMS statistiskt har på duellen mellan stridsfordon och pansarvärnssystem. Beräkningarna utgår ifrån påståendet att det krävs fem till sex pansarvärnprojektiler för nedkämpning av ett stridsfordon, vilket ökar till 35-43st då fordonet utrustas med VMS. Ökningen på cirka 700% visar dels på hur effektiviteten hos VMS höjer antalet erfordrade pansarvärnsvapen för att nå samma effekt, men även den potentiella vinningen att sänka effektiviteten genom telekrig. Arbetet studerade nyttjandet av bakgrundsstörning, då genereringen av störsignalen sker i ett separat telekrigsystem, vilket inte kräver utveckling av nya vapensystem eller ammunition. För utformning av störningen faller en kombinerad hastighet och avstånds vilseledning (CRV) eller brus lämplig och anses sänka effektiviteten hos VMS. Vinkelavhakning har i arbetet visat sig medföra stora förtjänster för ökad överlevnad hos telekrig/pansarvärnsenheter och vidare forskning är därför intressant.
Bengtsson, Jenny, Filip Nykvist, and Alvin Ljung. "Internet of Things : Uppkopplade sensorer med Raspberry Pi." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-328563.
Full textArvidsson, Erik. "Trådlösa sensorer för fuktindikering : Mosture indication with wireless sensors." Thesis, KTH, Byggvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93797.
Full textThe using of RFID-sensors in the Building industri is relatively new. Sensible solutions AB have developed a product for moisture indication in for example light weight exterior walls. The system is built upon one pair of passive RFIDtags placed on a card with a space between them so that the tags don’t disturb one another. One of the tags is covered with a moisture absorbing paper and the other one is left open to the surrounding air. The sensors are read with an RFID-reader which sends out signals until a response is received from both of the tags. The moistened tag requires greater signal strength to be read than the dry one because of changes in its resonance frequency when the tag is covered in moisture. Since different signal strengths are required to read the two tags, the difference between them can be used as a moisture indicator. The sensors are relatively cheap and could therefore be used in great amount to early discover leakage and high moisture levels. Within this master thesis, tests have been made to evaluate how reliable the sensors are in regard to distance between the reader and the sensors, the angle between them and the distance between several different sensors. The sensors have been acclimatized in exicators with different salt solutions which are emitting relative humidity’s between 12-97 %. They have then been read to determine how the values in the difference in signal strength varies with relative humidity. The pros and cons with the method have been studied through literature and the tests made. The tests show that the method is sensitive to distances and angles. However the limitation doesn’t depend on the sensors, but of the reader that is used today. The method requires that someone is reading the sensors manually on the construction site, for instance a construction site manager. Today there is only one limit to determine if it’s dry or damp. The limit is 5 dBm differences in power up level between the damp and the dry tag. The tests made in this thesis shows that a higher moisture level leads to a greater difference in signal strength between reading the open and the covered tag. When reading the sensors it requires that the reader is aimed straight toward the sensor so that “correct” values will be received. A new, better reader will be used in February 2012. Consequently a new upgrade of the critical moisture level will be made. iii
Hannu, Linus. "Detektering från prickskyttar från helikoptrar : elektrooptiska sensorer i VMS." Thesis, Försvarshögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-3994.
Full textCurrently, Sweden has operative Black Hawk helicopters in Afghanistan. The tasks they are solving in Afghanistan are forward and tactical Medical Evacuation (MEDEVAC). This work is about how existing Electronic Warfare Systems in helicopters can be supplemented in order to face a present sniper-threat during forward MEDEVAC in a conflict area which environmentally reminds of Afghanistan. In this work, a few possible techniques will be analyzed. This analyze will be based on aspects from a constructed scenario where the task to be solved, the conflict area, and the known threat is described. The result shows that MEDEVAC-helicopters can be equipped with operator-controlled sensor-gimbals where different electro-optical sensors can be combined. Gimbals allow reconnaissance in 360°. This contributes to the military utility since the main task can be solved by the helicopter personnel more effectively. Also, the probability of survival will probably increase and the personnel and wounded soldiers might feel more secure than before.
Szacinski, Anders. "Konstruktion av en mobil robot som kan röra sig i okända rum." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-1354.
Full textAoun, Samir, and Fredrik Arvidsson. "Undersökning av lämpliga sensorer till ett övervakningssystem för farliga zoner." Thesis, Högskolan i Halmstad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40621.
Full textThis report presents surveys of various techniques to identify people in a predetermined area. RCWL-0516 radar module and camera monitoring were methods that were investigated and tested. A distance measurement test was done on RCWL-0516, once through different materials and another with sensitivity manipulation of the module. At the same time, we tested various image analysis methods in connection with camera surveillance. In the result, we concluded that video surveillance with image analysis, for example You-Only-Look-Once-algoritmen (YOLO), was a good solution to the problem presented while the radar module was not as suitable.
Edman, Agnes. "Optiska Time-of-Flight sensorer kan användas för att mäta steghöjd och stegbredd under gång : En utvärdering av sensorer i en laborativ och reell miljö." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135939.
Full textInom sjukvården kan det i vissa fall vara intressant att studera en persons gång. Detta kan göras mer eller mindre avancerat och av olika anledningar som för diagnostik eller uppföljning efter ingrepp. Det har tidigare skapats ett mätsystem för mätning av gångparametrar på avdelningen Medicinsk teknik - Forskning och Utveckling vid Norrlands Universitetssjukhus. I det arbetet testades optiska sensorer som använder en triangulerande metodik. Den existerande tekniken hade dock begränsningar i sitt mätutförande vilket ledde till ett behov av att ersätta dessa med en ny typ av sensor. Målet med det här arbetet var därför att utvärdera två andra sensorer, VL6180 och VL53L0X, och undersöka om de kan användas för mätning av stegbredd och steghöjd. Ett mätsystem skapades i för att kommunicera med och samla in data från sensorerna. Därefter utfördes tester, främst laborativa tester med även ett test med den ena sensorn i reell miljö på testperson. Båda sensorerna visar på bra precision och linjäritet på de intressanta avstånden och ger resultat med en upplösning på hela millimetrar. VL6180 opererar bättre på väldigt nära håll men har en begränsning i att det maximala mätavståndet ligger kring 18 cm och den maximala samplingsfrekvensen under 43 Hz. Den frekvensen går att programmera men är instabil. För att kunna placera sensorerna nere vid vristen vid breddmätning krävs en mycket hög samplingsfrekvens för att få in tillräckligt med mätdata. VL53L0X kan komma upp i en en samplingsfrekvens på 50 Hz men det på bekostnad av sämre precision än vid lägre frekvenser. Huruvida VL6180 och/eller VL53L0X kan placeras vid vristen har inte bekräftats. VL53L0X testades med testperson och fungerade då för höjdmätning och breddmätning vid vaden. VL6180 bedöms kunna användas som sensor för mätning av stegbredd och VL53L0X för mätning av stegbredd och steghöjd.
Ludvigsen, Åshild Ingeborg. "Analyse av kommunikasjon mellom sensorer i system for gass- og flammedeteksjon." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11318.
Full textStålberg, Ingela. "Mobilt övervakningssystem : System för internetkommunikation mellan sensorer, webbsida, server och databas." Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-18048.
Full textCarlsson, Fredrik, and Fransson Alexander. "Smarta sensorer i bilindustrin : En undersökning av två sensorlösningar för växelspakar." Thesis, Högskolan i Jönköping, Tekniska Högskolan, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-35113.
Full textSvensk, Fredrik. "Avvägning mellan synfält och räckvidd med infraröda sensorer - Nödvändighet eller utvecklingsfråga?" Thesis, Försvarshögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-2760.
Full textJenssen, Henrik, and Christoffer Olsson. "Jämförelse mellan trådlösa sensorer med fjärravläsning och konventionell mätning med totalstation." Thesis, Mittuniversitetet, Institutionen för ekoteknik- och hållbart byggande, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-42690.
Full textTo continuously develop, evaluate and implement new technology is animportant part in all trades and all products shall contribute to a moreefficient workflow. Surveying can be deemed as a foundation in construction,infrastructure and field work and is therefore vital for the marketsdevelopment and streamlining. This study treats a comparison between aconventional surveying method and a new form of surveying equipmentwhich allows remote readings. The study was implemented to develop aperception regarding if the new form of technology is a valid form ofsurveying in comparison to the traditional surveying methods. Based on thestudies result the usability is evaluated and an analysis determines if this newtechnology is suitable in this field of work.This study was made at the hydropower plant Kvarnfallet in Rörvattnet,Jämtland, where a mountain shaft, 40 meter deep is opened to allow forservice and inspection related labour. Surveying is performed both with totalstation and these new wireless sensors to determine whether the exposedmountain shaft shows any movement. With help from Mitta AB in Östersundthe study was achieved by comparing different surveying methods used onsite, thereafter the outcome is analyzed. The results show there are clearbenefits with the new surveying method, although the range of use isrestricted compared to the conventional approach. This specific project issuited for the new type of technology since the surveying only requiresmeasuring of static points and retrieves data continuously in a short timespan. In combination with remote analysis through a web monitor enableseconomic, environmental and safety benefits.The new technology is suited for projects in which continuous surveying froma static position is required. It is by contrast crucial to collect the data in closeproximity to the same time of day to minimize the margin of error due tofluctuations in temperature.
Betyg 2021-06-04
Evander, Johan. "Lägesbild : Problemområden vid skapandet." Thesis, Swedish National Defence College, Swedish National Defence College, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-101.
Full textWithin the framework of the concept of Network Based Defence (NBF) services should be available in the network, in order to increase the aggregate capacity. A common situation picture is one of these services.
The aim of this paper is to answer the problem "What are the main problem areas in the creation of a situation picture in the land arena, with the help of the technical sensors that exist today?" and to develop a basis for continued research in the field situation in the concept Networking Enabled Command, Control and Collaboration (NEC3) at JCDEC (Joint Concept Development and Experimentation Centre). To answer the problem, a descriptive method is to be used in descriptions of the land arena, the information arena and the sensors and a deductive method is used when analyzing the asensors in the land arena.
The problems that exist in the creation of a common situation picture, is that different types of obstacles makes it difficult for the sensors, the large number of people who are not combatants and that it is difficult to judge if a civilian vehicle is a threat, then it could be driven by civilians or by combatants.
Andreasson, Martin, and Johan Larsson. "Bike Around." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15325.
Full textLima, Rogerio Rodrigues. "Desenvolvimento de uma cabeça sensora para veículos aéreos não-tripulados." Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/BUBD-9GJFQS.
Full textVeículos Aéreos Não-Tripulados (VANTs) têm sido foco de muitas pesquisas nos últimos anos, devido ao grande número de aplicações potenciais para robôs aéreos, nos campos civil e militar. Entretanto, os sistemas eletrônicos comercialmente disponíveis para essa classe de veículos em geral são caros, e a importação dos mesmos de outros países para o Brasil pode estar sujeita a severas restrições. Neste trabalho, apresenta-se o desenvolvimento de um sistema de instrumentação eletrônica embarcada, doravante denominado "Cabeça Sensora", objetivando alcançar características equivalentes as dos sistemas comerciais, mas como uma plataforma nacional de baixo custo e aberta, que possa ser facilmente reproduzida em outras instituições de ensino ou pesquisa. O sistema proposto é capaz de estimar ângulos de atitude e contêm diversos sensores, tais como sensores inerciais (acelerômetros e girômetros), magnetômetros, receptor GPS, sensores de pressão estática e dinâmica, necessários para aplicações de navegação inercial, guiagem e controle de veículos aéreos. São abordados os desenvolvimentos de hardware e de firmware, que incluem a implementação de um algoritmo de fusão sensorial para estimação de atitude. Quatro algoritmos de fusão sensorial foram avaliados em ambiente de simulação, e os respectivos resultados comparados para se determinar aquele que, com base no seu desempenho, foi posteriormente implementado na Cabeça Sensora. Finalmente, resultados experimentais obtidos com um protótipo da Cabeça Sensora são apresentados e analisados.
Silveira, Felipe Zanette da. "Efeito de diferentes dopantes da polianilina nas características sensoras ao gás amônia." Florianópolis, SC, 2011. http://repositorio.ufsc.br/xmlui/handle/123456789/95906.
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A busca por melhoramentos e aplicações para os polímeros condutores vem sendo um grande foco de pesquisa na atualidade. Devido às propriedades especiais e à fácil síntese, a polianilina se mostra uma grande promessa tecnológica. Neste panorama o presente trabalho enfoca síntese, caracterização e utilização da polianilina dopada com três diferentes ácidos: ácido fluorídrico, clorídrico e sulfúrico, como elemento sensor ao gás de amônia. Para isso os três diferentes materiais foram sintetizados e submetidos a caracterizações elétricas, análise de espectroscopia de infravermelho por transformada de Fourier (FT-IR), difração de raios-X (DRX), microscopia elétrica de varredura (MEV) e energia dispersiva de raios-X (EDS), além de ciclos de resposta ao gás de amônia. Os resultados demonstraram que todos os ácidos utilizados deram origem a polímeros condutores, sendo que a maior condutividade foi obtida com o emprego do ácido H2SO4 no processo de dope da polianilina. As amostras avaliadas apresentaram-se sensitivas ao gás de amônia, sendo que tal sensibilidade se mostrou dependente do ácido utilizado. A morfologia e cristalinidade também se mostraram dependentes do tipo de ácido utilizado no processo de dope do material, sendo que a cristalinidade é maior para o polímero cujo contraíon empregado apresenta menor tamanho molecular, e maior eletronegatividade.
Melin, Peter, Markus Thulin, and Emil Axelsson. "Mätdatainsamling." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1185.
Full textRapid Granulator is one of the world's largest producers of granulators, which is a kind of grinder
who grinds discarded plastics to granules which later can be reused when pressure molding plastics.
The company wanted help in developing a new, or alternatively extending their previous,
measurement equipment. The old equipment was hard to use, required changes in the code for
different measurement scenarios and had a limited array of measuring quantities. Rapid had an idea
of a similar concept only with a greater number of input ports, better range of applicable sensors and
an advanced yet easy to use interface. The system is supposed to be placed at Rapid's test department
where it will be used as a tool for finding faults and provide data which can be used for further
development of the granulators.
The project's members accepted the task and immediately began searching for suitable components
for the system. After the search was completed a list of costs, limitations, sensors, I/O's and
development environment was presented to Rapid's staff. In consultation with their staff some
components were ordered, and the development team was asked to keep the system open for future
upgrades.
Some difficulties arose when shipment times which were promised to four weeks actually took six
weeks. In the mean time the chassis of the measurement cart were constructed. One working day was
spent at Rapid's workshop to assemble the cabinets with the rack and the wheelbase.
LabVIEW arrived first and quite a lot of time was spent on getting acquainted to the program. When
the parcel containing all the electronic material arrived, everything was mounted and the final stage
involving programming and testing of the sensors and the measurement cart could commence.
Tests with accelerometer, strain gauges and PT-100 showed that the measurement unit worked. The
sampled data acquired from the cart were compared to measurements made with calibrated
instruments.
Nordström, Mikael. "Atmosfärens påverkan på det taktiska utnyttjandet av elektromagnetisk vågutbredning för radar och optiska sensorer?" Thesis, Försvarshögskolan, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-1814.
Full textThe main purpose with this paper is to show how different atmospheric conditions have aninfluence on the tactical utilization of the electromagnetic propagation and the necessity for anoperator to understand and make an assessment of the effects.Sensors that use the electromagnetic spectra are more and more common in our militarysystems. Weather and the atmosphere effect the transmission and the propagation ofelectromagnetic waves. Different atmospheric and weather phenomena effect the choice offrequencies and wavelength of the sensors and create restraints in utilization. Utilization ofsensors and systems to detect and track targets and threats demands knowledge in how toassess how the sensors or the systems are affected when they are used in different climatic andweather conditions. The need for this is great and in the future it will increase when we willmore and more be relying on the technical expedient to detect and destroy a target in combatenvironment. In the future, a changing environment with international commitments in aclimate that is very different from the Swedish climate, will further influence the tests and theknowledge that is required. The paper describes situations where weather has an influence onutilization of electromagnetic waves for radar and optical sensors. The paper also looks intothe need for education in meteorology and weather influence.
Avdelning: ALB - Slutet Mag 3 C-upps.Hylla: Upps. ChP T 01-03
Sæle, Astrid Dimmen. "Nytteverdi og lønnsomhet ved bruk av sensorer og fjernstyring for raskere feillokalisering i distribusjonsnett." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20737.
Full textDIAS, Ana Carolina Matos da Silva. "Desenvolvimento de plataformas sensoras para detecção eletroquímica do antígeno NS1 do vírus da dengue." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17374.
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FACEPE
A infecção pelo vírus dengue (DENV) é uma das doenças tropicais mais negligenciadas e de maior importância de saúde pública no mundo. Novos métodos de diagnóstico da doença têm sido estudados através da detecção da proteína NS1 do DENV. O antígeno NS1 é um importante marcador precoce da fase aguda da dengue, secretado em altas concentrações pelo vírus no sangue de pessoas infectadas logo nos primeiros dias, porém, não é muito utilizado na rotina laboratorial para diagnóstico da doença devido ao alto custo dos ensaios. A presente tese descreve o desenvolvimento de duas plataformas sensoras eletroquímicas baseadas em eletrodos impressos (EIs) modificados com nanomateriais para detecção do antígeno NS1 do DENV. Os EIs foram confeccionados utilizando-se a impressão de tinta de carbono sobre o polietileno tereftalato (PET), suporte para impressão dos moldes. Inicialmente, foram estudados os efeitos de nanotubos de carbono e sua contribuição na transferência de elétrons, condutividade e aumento de área eletroativa da plataforma sensora. O estudo foi baseado na incorporação de nanotubos de carbono funcionalizados com grupos carboxílicos à tinta de carbono. Para detecção do NS1, um imunoensaio do tipo “sanduíche” foi realizado, no qual a captura específica do NS1 pôde ser avaliada através das reações redox da enzima peroxidase conjugada ao anticorpo. Uma faixa linear entre 0,04 g/mL e 2 g/mL de NS1 foi obtida, indicando boa performance analítica do imunossensor, com coeficiente de correlação linear de 0,996 (p<0.0001, n=8) e limite de detecção de 0,012 g/mL de NS1. Posteriormente, foi investigada a contribuição de nanopartículas metálicas no desenvolvimento de sensores eletroquímicos livres de marcação. Foram utilizadas nanopartículas de ouro (NPsAu) funcionalizadas com grupos amina para a imobilização covalente de anticorpos. Na síntese das NPsAu, foi utilizado o polietilenoimina como agente redutor e funcionalizante para promover uma ligação amida com o anticorpo anti-NS1. O imunossensor desenvolvido mostrou curva de calibração com faixa de concentração linear entre 0,1 g/mL e 2 g/mL de NS1 (r = 0,995, p<0.0001, n=7) e limite de detecção de 0,03 g/mL de NS1. A contribuição dos nanomateriais para as plataformas sensoras desenvolvidas mostrou-se efetiva na sensibilidade analítica, devido ao aumento de área eletroativa e maior quantidade de anticorpos imobilizados. A aplicação destes nanomateriais nos imunossensores proporciona novas alternativas de diagnóstico para detecção da proteína NS1 do DENV.
Infection by Dengue Virus (DENV) is one of the most neglected tropical diseases and of higher importance of public health worldwide. New methods of diagnosis of the disease have been studied through the detection of NS1 protein of DENV. NS1 antigen is an important early marker of acute dengue infection secreted in high concentrations by the virus in the blood of infected people in first days, however it is not widely used in the laboratory routine for diagnosis of the disease due to high cost of assays. The present thesis describes the development of two electrochemical sensor platforms based on screen-printed electrodes (SPEs) modified with nanomaterials for detection of NS1 antigen of DENV. SPEs were prepared using carbon ink printing on the polyethylene terephthalate (PET), support for molds printing. Initially, the effects of carbon nanotubes and their contribution to the electron transfer, conductivity and increase of electroactive area of the sensor platform were studied. The study was based on the incorporation of carbon nanotubes functionalized with carboxylic groups to the carbon ink. For NS1 detection, a sandwich-type immunoassay was carried out, wherein the specific capture of NS1 may be assessed by redox reactions of peroxidase enzyme conjugated to the antibody. A linear range between 0.04 g/mL and 2 g/mL NS1 was obtained, indicating good analytical performance of the immunosensor, with linear correlation coefficient of 0.996 (p<0.0001, n=8) and limit of detection of 0.012 g/mL NS1. Subsequently, the contribution of metal nanoparticles in the development of label-free electrochemical sensors was investigated. Gold nanoparticles (AuNPs) functionalized with amine groups were used for covalent immobilization of antibodies. In the synthesis of AuNPs, polyethyleneimine was used as a reducing and functionalizing agent to promote an amide bond with anti-NS1 antibody. The developed immunosensor showed calibration curve with linear concentration range between 0.1 g/mL and 2 g/mL NS1 (r = 0.995, p<0.0001, n = 7) and limit of detection of 0.03 g/mL NS1. The contribution of nanomaterials for the sensor platforms developed proved effective in the analytical sensitivity due to the increase of electroactive area and larger amount of immobilized biomolecules. The application of these nanomaterials in immunosensors provides new alternatives of diagnosis for detection of NS1 protein of DENV.
Wingqvist, Jenny, and Josephine Lantz. "Utvärdering av IMU-sensorers precision vid mätning av handledens vinkelhastigheter : Jämförande studie med ett optiskt spårningssystem." Thesis, KTH, Medicinteknik och hälsosystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254059.
Full textMusculoskeletal disorders (MSDs) are increasingly frequent amongst workers and there is a clear connection between work injuries and wrist angular velocities. One of the biggest issues therefore is the currently limited availability of means to measure these angular velocities. The aim of this study is to validate the usability of the IMU sensors to measure angular velocities. This is done by comparing the data from the IMU:s with the data obtained with the optical motion tracking system (OTS), which is considered gold standard within this field of studies. An experiment consisting of eight exercises was conducted: three standard movements (flexion and rotation in the pace 40, 90 and 140 repetitions per minute) and four simulated practical work tasks (painting, folding paper, computer exercise and using a hairdryer). The limits of agreement for the standard movements (10 subjects) were -31,8 degrees/s and 34,2 degrees/s, whereas for the simulated practical work tasks they were -35,1 degrees/s and 28,2 degrees/s. The lowest mean value of the root mean square deviation (RMSD) value was 15,7 degrees/s which represents the 40 BPM task whilst the highest mean value was 93,9 degrees/s which correspond to the painting task. The mean value of the correlation coefficients between the IMU:s and the OTS ranged between 0,97 and 0,42 and the correlation coefficient between the subjects 50:th percentiles of the angular velocity, was 0,95 for the standard movements whilst for the practical work tasks it was 0,96. The mean value of the absolute difference between the sensors and the OTS was given in percentiles (10th, 50th and 90th). The largest range within the 50th percentile occurred during the 140 BPM task (18,3 ± 24,6) and the smallest range during the 40 BPM task (3,5 ± 4,7). Although the measured angular velocities vary to a certain extent between the two methods, we conclude that the IMU sensors present the potential to work as measuring units for wrist angular velocities and with further development the current differences can be minimized.
Forte dnr: 2017-01209 "Enkel och tideffektiv metod att mät, analysera och presentera biomekaniskbelastning för hand-handled"
Palacio, Bonet Francisco. "Desarrollo de una tarjeta RFID flexible con capacidades sensoras para aplicaciones en logística de alimentación." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/459301.
Full textFood Logistics require new information technology tools for traceability and advanced monitoring. Industries do not only want to introduce more data concerning food products, but also require having maximum information about environment data during transport and storage, as well as any additional data, that may be essential to the product lifetime. Typical variables of interest may be temperature, humidity, light and chemicals. This doctoral thesis consists in the development of a semi-active tag with sensing capabilities. The tag features power feed from a 13.56 MHz field, plus a battery for sensing purposes. This tag allows interfacing a variety of sensors, as well as data logging for the full duration of the transport. The tag is ISO/IEC 15693 compliant. The developed tag features a credit card form factor and it has been integrated onto a flexible substrate using commercial components. Along this manuscript is described all the tag development, the application description and the specifications of the tag, all the design, from de conceptual to the detailed. It is explained all the hardware and software/firmware implemented in all the components involved in the ISO/IEC 15693 standard. It also described the design of the two readers used with the tags. After the description of the tag development it is reported all the results obtained from the functionality tests and field test where the tag was compared with another commercial data loggers. And finally it is described a gas sensor implementation. It have been used an array of ultra low power MOX sensors in order to detect specific volatile compounds related with the fresh food fruits. As the tag as a very small battery, has been used a save energy method that consist in switch on and off the heather of the MOX sensor, allowing this implementation. It is also described the MOX sensor behavior working in such conditions, how the limit of detection increases, how the sensitivity decreases, how the stabilization time increases and how the sensor base line and noise change in relation of the power consumption saves.
Bondesson, Carl, and Erik Stigenius. "Autonom bil med enkapseldator och ultraljudssensorer : tillämpning av en Arduino mikrokontrollerplattform och HC-SR04 sensorer." Thesis, Uppsala universitet, Industriell teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255762.
Full textHooshidar, Daniel, and Yobart Amino. "Implementation av portabla REM-identifierande sensorer : Undersökning kring lämpliga, icke-påträngande metoder för REM-igenkänning." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232117.
Full textTiredness in traffic is a major problem in society. It is especially dangerous to drive heavy trucks when tired because these vehicles are large and often have vital roles when involved in traffic accidents. To address the problem, this degree project has studied which sleep stage is most appropriate to wake up during, in order to wake up sharp and alert, and what types of techniques and methods are suitable for portable detection of Rapid-Eye-Movement. Previous work and studies have been done which indicates that awakening during REM sleep is optimal for feeling alert. The chosen methods are based on variants of well-established techniques that are used to identify sleep stages. Electrooculography is used to measure eye movements using four electrodes placed on the head. Body movements are detected by an accelerometer attached to the arm. Pulse measurements are made and used to calculate the pulse variation during sleep. The goal is to create a prototype which will know when the user is in REM sleep and then wake the user up. This work is divided into two embedded systems that are made between two different degree projects. The result was three sensors that worked individually. Due to lack of time and a longer troubleshooting, the prototype was not completed. Before the sensors can be used in a product, additional tests are required under the supervision of a sleep specialist.
Lindblom, Anna, and Frida Wennberg. "Automatiserad produktionscell för lasersvetsning av fläkthus i titan." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-762.
Full textFör att vara framgångsrik i dagens tillverkningsindustri gäller det att vara konkurrenskraftig och komma med nya tillverkningssätt. Därför satsar Volvo Aero på lasersvetsning och automation. På Aero-Craft i USA grovbearbetas fläkthus i titan. Fläkthusets diameter är cirka tre meter och dess bakre del sätts idag samman från tre delar med hjälp av skruvförband och plasmasvets. Volvo Aero vill lasersvetsa dessa delar istället. En studie har därför påbörjats som skall visa hur en produktionscell för lasersvetsning skulle kunna se ut och fungera. Svetsarna är alla av typen stumsvetsar och det som skall svetsas är tre axiella skarvar, två rundskarvar och fastsvetsning av ett växellådsfäste. Innan svetsning häftsvetsas delarna först ihop och 3D-skanner används för inspektion. Efter att svetsen svalnat kontrolleras rundskarvarna av en digitalröntgen. Allt skall ske i produktionscellen. Resultatet presenterar en produktionscell uppdelad i två rum. Det första rummet är laserskyddat, och där utförs svetsning av axiella skarvar och växellådsfäste. Ett hål laserskärs ut där växellådsfästet skall sitta. Det andra rummet är både röntgen- och laserskyddat och där svetsas rundskarvar. En fogföljare med laserdiod och kamera används under svetsprocessen för att rikta laserstrålen efter skarven. I rum ett finns en processrobot och en hanteringsrobot och i rum två en processrobot. Fixturerna som presenteras i rapporten är endast konceptuella. Antalet fixturer är en till rum ett och två likadana till rum två. Fixtureringen i rum två utgörs av en expanderfixtur med rotgasbackar i aluminium. På Volvo Aero används vanligen expanderfixturer vid svetsning, men de har aldrig gjorts i den storlek som krävs för fläkthuset. Krav som ställs på manipulator är att den skall klara detaljens och fixturens vikt, samt att den skall klara uppsatta svetstoleranser.
Väljamets, Erik, and Magnus Yngvesson. "Det Intelligenta Huset : - En studie i hemautomation." Thesis, KTH, Byggvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102404.
Full textVilhelmsson, Björn. "Nytänkande trygghetslarm." Thesis, Mittuniversitetet, Institutionen för naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-36622.
Full textBerg, Magnus. "Självsanerande ytbeläggning i nanostruktur : Är det möjligt att applicera på elektrooptiska sensorer och till vilken nytta?" Thesis, Swedish National Defence College, Swedish National Defence College, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-166.
Full textDå marina enheter numera deltar i internationella missioner, kommer den nya miljön som enheterna opererar i att påverka bland annat deras sensorer.
Den här studien avhandlar några av de nu framtagna självsanerande ytbeläggningarna och ger en presentation av hur de fungerar på några marina elektrooptiska sensorers yttersta linser.
Studien försöker ge svar på ytbeläggningarnas transmittans och hur effektivt de kan sanera bort oönskade saltlager tillsammans med andra nedsmutsande partiklar från sensorlinserna samt den militära nyttan av att använda självsanerande ytbeläggning.
This study deals with now developed self-cleaning coatings and gives a presentation of how they work on some electro-optical sensor lenses used in the navy. The study also examines the coatings transmittance and how efficient they can clean the sensor lenses from undesired salt layers and other soiling particles.
After the introduction the study presents basic facts of the chosen sensors, nanotechnology, surface wettability and also salts and salinity. Thereafter the study describes current nano-research on self-cleaning coatings and possible results there of, when the coatings are applied on the different sensors.
In the study I give my opinion of the military benefit of using self-cleaning coatings, which from a general point of view is that there mostly are positive effects using such a coating, in a technical perspective.
The study ends with conclusions that there are self-cleaning coatings based on TiO2-nanoparticles which can transmit within the visual spectra and also can clean undesired soiling particles. But can not confirm that these coatings have the desired effect on salt crystals, or transmit within wavelengths spectrum for IR-detectors and lasers.
ChpT 08-10
Fellinghaug, Jarl André. "SUBSEA RECEIVER STATION FOR COMMUNICATION WITH DOWN WELL SENSORS : Undervanns mottakerstasjon for kommunikasjon med brønnhull sensorer." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22409.
Full textJakobsson, Uno, and Martin Andréasson. "Wildlife Detection Network." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-17765.
Full textKhanahmadi, Amir, and Andreas Johansson. "Avståndsmätning med Hög Noggrannhet till Låg Kostnad." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25595.
Full textAktiva sensorer används väldigt mycket i samhället och industrin för att till exempel få bättre kontroll över processer eller för att få beröringsfria funktioner hos olika produkter. Inom industrin finns det ett stort intresse för att ta fram säkra automationsprodukter som kan styras med hög noggrannhet men fortfarande till en låg kostnad. Målet med det här projektet är att ta fram en prototyp av en beröringsfri avståndssensor som mäter avstånd med hjälp av IR-ljus. Sensorn ska kunna användas till olika applikationer inom industrin med relativt hög noggrannhet och vara kompakt men till en låg kostnad. Genom att implementera en avståndssensor i en produkt kan även säkrare detekteringar av ett objekts närvaro utföras. I projektet används en ny avståndssensor, EPC600 från ESPROS. EPC600 använder sig av fasskiftsmetoden för att mäta avstånd och har även integrerade sensorer för att mäta omgivningsljus och temperatur. Efter att en modell för korrigering av mätvärden gjorts, uppnåddes en noggrannhet på ±10mm vid mätningar av avstånd upp till 2500mm under påverkan av omgivningsljus på 400lux. Måtten på sensorn är 29x20x24mm och priset för protoypen 250SEK.
Haglund, Maria. "Högfrekventa mätningar av turbiditet som indirekt mätning av totalfosfor i sju vattendrag." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446227.
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