Thematische Bibliographien / Optical distance measurement

Inhaltsverzeichnis

Zeitschriftenartikel
Dissertationen
Bücher
Buchteile
Konferenzberichte
Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Optical distance measurement“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 4. Februar 2022

Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an

Wählen Sie eine Art der Quelle aus:

Machen Sie sich mit den Listen der aktuellen Artikel, Bücher, Dissertationen, Berichten und anderer wissenschaftlichen Quellen zum Thema "Optical distance measurement" bekannt.

Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.

Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.

Zeitschriftenartikel zum Thema "Optical distance measurement"

Kienle, Patrick, Lorena Batarilo, Markus Akgül, Michael H. Köhler, Kun Wang, Martin Jakobi und Alexander W. Koch. „Optical Setup for Error Compensation in a Laser Triangulation System“. Sensors 20, Nr. 17 (01.09.2020): 4949. http://dx.doi.org/10.3390/s20174949.

Der volle Inhalt der Quelle

Annotation:

Absolute distance measurement is a field of research with a large variety of applications. Laser triangulation is a well-tested and developed technique using geometric relations to calculate the absolute distance to an object. The advantages of laser triangulation include its simple and cost-effective setup with yet a high achievable accuracy and resolution in short distances. A main problem of the technology is that even small changes of the optomechanical setup, e.g., due to thermal expansion, lead to significant measurement errors. Therefore, in this work, we introduce an optical setup containing only a beam splitter and a mirror, which splits the laser into a measurement beam and a reference beam. The reference beam can then be used to compensate for different error sources, such as laser beam dithering or shifts of the measurement setup due to the thermal expansion of the components. The effectiveness of this setup is proven by extensive simulations and measurements. The compensation setup improves the deviation in static measurements by up to 75%, whereas the measurement uncertainty at a distance of 1 m can be reduced to 85 μm. Consequently, this compensation setup can improve the accuracy of classical laser triangulation devices and make them more robust against changes in environmental conditions.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Pillarz, Marc, Axel von Freyberg, Dirk Stöbener und Andreas Fischer. „Gear Shape Measurement Potential of Laser Triangulation and Confocal-Chromatic Distance Sensors“. Sensors 21, Nr. 3 (30.01.2021): 937. http://dx.doi.org/10.3390/s21030937.

Der volle Inhalt der Quelle

Annotation:

The demand for extensive gear shape measurements with single-digit µm uncertainty is growing. Tactile standard gear tests are precise but limited in speed. Recently, faster optical gear shape measurement systems have been examined. Optical gear shape measurements are challenging due to potential deviation sources such as the tilt angles between the surface normal and the sensor axis, the varying surface curvature, and the surface properties. Currently, the full potential of optical gear shape measurement systems is not known. Therefore, laser triangulation and confocal-chromatic gear shape measurements using a lateral scanning position measurement approach are studied. As a result of tooth flank standard measurements, random effects due to surface properties are identified to primarily dominate the achievable gear shape measurement uncertainty. The standard measurement uncertainty with the studied triangulation sensor amounts to >10 µm, which does not meet the requirements. The standard measurement uncertainty with the confocal-chromatic sensor is <6.5 µm. Furthermore, measurements on a spur gear show that multiple reflections do not influence the measurement uncertainty when measuring with the lateral scanning position measurement approach. Although commercial optical sensors are not designed for optical gear shape measurements, standard uncertainties of <10 µm are achievable for example with the applied confocal-chromatic sensor, which indicates the further potential for optical gear shape measurements.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Wang, Wei Chen, Ding Chen, Hong Tang Gao und Zi Ben Yang. „Study on Dynamic Measurement of Plane Distance“. Key Engineering Materials 625 (August 2014): 91–97. http://dx.doi.org/10.4028/www.scientific.net/kem.625.91.

Der volle Inhalt der Quelle

Annotation:

Step gauge is the most typical multiple target standard of plane distance with a wide range of applications. The calibration of step gauge is, however, difficult because of its unique structure. In this paper, a new method for measuring plane distance is presented. The principle of light-section microscope is used in accurate positioning of the planes being measured. Then the optical interferometry techniques are used to realize continuous dynamic measurement of the plane distance. Based on this method, a novel optical probe is built and installed on a laser interferometer for length measurements. A series of experiments were carried out for determining the accuracy of positioning the optical probe and repeatability of the measuring system. Experimental results show that measurement repeatability is better than 16 nm, and measurement uncertainty (k=2) is less than 0.03 μm + 1.0×10-6L, for a total length of L being measured in micrometers.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Neitsch, Marie, Iris-Susanne Horn, Mathias Hofer, Andreas Dietz und Miloš Fischer. „Integrated Multipoint-Laser Endoscopic Airway Measurements by Transoral Approach“. BioMed Research International 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/6838697.

Der volle Inhalt der Quelle

Annotation:

Objectives. Optical and technical characteristics usually do not allow objective endoscopic distance measurements. So far no standardized method for endoscopic distance measurement is available. The aim of this study was to evaluate the feasibility and accuracy of transoral airway measurements with a multipoint-laser endoscope.Methods.The semirigid endoscope includes a multipoint laser measurement system that projects 49 laser points (wavelength 639 nm, power < 5 mW) into the optical axis of the endoscopic view. Distances, areas, and depths can be measured in real-time. Transoral endoscopic airway measurements were performed on nine human cadavers, which were correlated with CT measurements.Results.The preliminary experiment showed an optimum distance between the endoscope tip and the object of 5 to 6 cm. There was a mean measurement error of 3.26% ± 2.53%. A Spearman correlation coefficient of 0.95 (p=0.01) was calculated for the laryngeal measurements and of 0.93 (p<0.01) for the tracheal measurements compared to the CT. Using the Bland-Altman-Plot, the 95% limits of agreement for the laryngeal measurements were satisfactory: −0.76 and 0.93.Conclusions.Integrated multipoint-laser endoscopic measurement is a promising technical supplement, with potential use in diagnostic endoscopy and transoral endoscopic surgery in daily practice.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Gouaux, Flore, Noël Servagent und Thierry Bosch. „Absolute distance measurement with an optical feedback interferometer“. Applied Optics 37, Nr. 28 (01.10.1998): 6684. http://dx.doi.org/10.1364/ao.37.006684.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Xu, Xinyang, Ziqiang Zhang, Haoyun Zhang, Haihan Zhao, Wenze Xia, Mingzhao He, Jianshuang Li, Jingsheng Zhai und Hanzhong Wu. „Long distance measurement by dynamic optical frequency comb“. Optics Express 28, Nr. 4 (03.02.2020): 4398. http://dx.doi.org/10.1364/oe.381504.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Majumdar, Ayan, und Haiying Huang. „Compact optical fiber whitelight interferometric distance sensor for arbitrary small distance measurement“. Applied Optics 48, Nr. 19 (22.06.2009): 3702. http://dx.doi.org/10.1364/ao.48.003702.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

WANG Zhi-bin, 王志斌, 史国华 SHI Guo-hua, 何益 HE Yi, 丁志华 DING Zhi-hua und 张雨东 ZHANG Yu-dong. „Application of optical coherence tomography to distance measurement of optical surface“. Optics and Precision Engineering 20, Nr. 7 (2012): 1469–74. http://dx.doi.org/10.3788/ope.20122007.1469.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Junttila, Petri, Kalervo Nevala und Petter Kroneld. „Enhancing the Accuracy of MRI-Compatible Robots with an Optical Tracking System“. Solid State Phenomena 144 (September 2008): 191–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.144.191.

Der volle Inhalt der Quelle

Annotation:

Magnetic resonance imaging (MRI) is currently a widely used technology for obtaining a three-dimensional image of a patient’s internal structures. This study examines the measurement properties of an optical tracking system utilised in the MRI room. The results were used to assess the suitability of the device to be used as a part of the control system of a surgical robot. The position and orientation of the instrument, MRI scanner and the patient are measured using an optical tracking system in the MRI room. The measurement data can be used to display the instrument used as a part of the image of the patient. The optical tracking system used in the MRI room can also be considered as a part of the control system of a robot located in the room. When considering such use, the operations of the measuring device in different measurement conditions must be known. In terms of robot control, it is important to know the deviation attributed to measurement when defining the translation vector and orientation between two trackers. Five measurement series were carried out using the measurement device to examine the deviation in the translation vector and orientation data between two trackers. The distance and position between the trackers were changed between the measurement series. During the measurement series, the measurement device was moved to different distances from the trackers and the translation vector and orientation between the trackers were defined on the basis of the measurement results obtained. The measurements showed that the deviation of the translation vector did not significantly change as the measurement distance increased, but the deviation of orientation data between different trackers increased significantly. Deviation in the translation vector increased as the distance between trackers increased, but deviation in orientation did not change significantly.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Li Zhidong, 李志栋, 江月松 Jiang Yuesong, 桑峰 Sang Feng, 王林春 Wang Linchun, 邓士光 Deng Shiguang, 辛遥 Xin Yao und 郭泾平 Guo Jingping. „Interferometry for Absolute Distance Measurement“. Acta Optica Sinica 31, Nr. 3 (2011): 0314001. http://dx.doi.org/10.3788/aos201131.0314001.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Mehr Quellen

Dissertationen zum Thema "Optical distance measurement"

Veng, Mengkoung. „Self-mixing interferometry for absolute distance measurement : modelling and experimental demonstration of intrinsic limitations“. Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0077.

Der volle Inhalt der Quelle

Annotation:

La Self-Mixing Interférométrie (SMI) a été étudiée de manière approfondie au cours des cinq dernières décennies dans diverses applications. Les capteurs selon la technique SMI ont la diode laser comme la source de lumière, l'interféromètre et le détecteur. La lumière de la diode laser se propage vers une cible éloignée où elle est partiellement réfléchie ou rétrodiffusée avant d'être réinjectée dans la cavité active du laser. Lorsque la diode laser subit le retour optique externe, la lumière réfléchie imprimée avec des informations provenant de la cible éloignée ou du milieu de cavité externe induit une perturbation des paramètres de fonctionnement du laser. Pour les capteurs de mesure SMI tels que les applications de mouvement harmonique et de distance absolue, la méthode de comptage des franges est essentiellement utilisée pour déterminer respectivement le déplacement et la distance de la cible. La modélisation du phénomène SMI a été développée. L'équation unique qui décrit la condition de phase imposée par la rétro-injection optique est généralement appelée équation de phase. L'un des paramètres les plus importants cet équation est le paramètre C. Quand le C 1, le comportement du laser est stable. En revanche, quand le C > 1, des phénomènes plus complexes sont observés tels que l'effet d'hystérésis, la présence de multiples fréquences d'émission, la séparation de la ligne d'émission de fréquence causer la saut de mode et le phénomène de disparition des franges. Une approche bien acceptée dans la communauté décrit les régimes de SMI en fonction de la valeur du C de sorte que : le régime faible (0.1 < C < 1), le régime modéré (1 < C < 4.6) et le régime fort (C > 4,6). Le paramètre de rétro-injection C est directement impliqué dans le phénomène de disparition des franges. Bernal et al. a décrit que ce phénomène dépend de la régime qui décrits ci-dessus, c'està-dire que les franges commencent à disparaître uniquement dans le régime forte de la rétroinjection d’optique, tandis que Yu et al. a démontré que le nombre des franges est divisée par 2 dans la région 2 (7,8 < C < 14,0), 3 dans la région 3 (14,0 < C < 20,3) et ainsi de suite. Autres publications a proposé que deux paires de franges interférométriques pour une période complète de modulation disparaissent quand il y a une variation de C de 2. Cependant, à notre connaissance, aucune explication ou théorie précise sur le mécanisme de ce phénomène n'a été publiée jusqu'à présent. Dans cette thèse, nous rapportons l'observation de la disparition des franges dans le schéma de mesure de distance absolue. Par rapport au schéma de détection des vibrations, l'approche de la distance absolue garantit un paramètre de rétro-injection C stable permettant ainsi des conditions expérimentales plus répétables. Comme la cible est fixée à une certaine distance, l'amplitude de la lumière rétrodiffusée est facile à contrôler en utilisant des atténuateurs d’optiques variables. Les résultats expérimentaux montrent que le nombre de franges interférométriques continue de diminuer dans le signal SMI lorsque l'amplitude du coefficient de réflexion de la cible augmente
Self-mixing Interferometry has been studied extensively in the last five decades in various sensing applications. Sensors under the SMI technique have the laser diode as the light source, the interferometer, and the detector. The light from the laser diode propagates towards a distant target where it is partially reflected or back-scattered before being re-injected into the active cavity of the laser. When the laser diode experiences the external optical feedback, the reflected light imprinted with information from the distant target or from the external cavity medium induces perturbation to the operating parameters of the laser. For SMI measurement sensors such as harmonic motion and absolute distance applications, the fringe counting method is basically used to determine the target's displacement and distance respectively. Two different approaches to modelling the SMI phenomenon have been developed: the three-mirror cavity and the perturbation of the rate equation. The single equation that describes the phase condition imposed by the optical feedback is usually referred to as the excess phase equation. One of the most important and most useful parameters in the excess phase equation is the feedback parameter C as it can be used to qualitatively categorize the regime of the laser under optical feedback. When the feedback level C < 1, the laser behaviour is stable. On the other hand, when the feedback level C > 1, more complex phenomena are observed such as hysteresis effect, presence of multiple emission frequencies (including the unstable frequencies), apparent splitting of the emission line due to mode hopping and fringe disappearance phenomenon. The fringes disappearance phenomenon in the self-mixing interferometry occurs whenever the external round-trip phase at free-running state is modulated by either external modulation such as external cavity length changes or internal modulation when the laser injection current is modulated with a high back-scattered light power. This phenomenon has been observed by many authors for harmonic motion or vibration application and more recently in the case of the absolute distance measurement scheme when the laser injection current is modulated in the triangle waveform. This phenomenon is highly dependent on the feedback parameter C and it is described in detail based on the coupled cavity model. The primary cause for fringes disappearance is demonstrated to be the expansion of the excess phase equation stable solutions range with the increment of the parameter C, thus reducing the number of stable solutions for a given phase stimulus. This new approach in the modelling of the fringe disappearance phenomenon allows determination of the C values for which a pair of fringes are expected to disappear and as a consequence correlates the number of missing fringes to the value of C. This approach is validated both by a behavioural model of the laser under optical feedback and by a series of measurements in the SMI absolute distance configuration

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Widjanarko, Taufiq. „Hyperspectral interferometry for single-shot profilometry and depth-resolved displacement field measurement“. Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8349.

Der volle Inhalt der Quelle

Annotation:

A new approach to the absolute measurement of two-dimensional optical path differences is presented in this thesis. The method, which incorporates a white light interferometer and a hyperspectral imaging system, is referred to as Hyperspectral Interferometry. A prototype of the Hyperspectral Interferometry (HSI) system has been designed, constructed and tested for two types of measurement: for surface profilometry and for depth-resolved displacement measurement, both of which have been implemented so as to achieve single shot data acquisition. The prototype has been shown to be capable of performing a single-shot 3-D shape measurement of an optically-flat step-height sample, with less than 5% difference from the result obtained by a standard optical (microscope) based method. The HSI prototype has been demonstrated to be able to perform single-shot measurement with an unambiguous 352 (m depth range and a rms measurement error of around 80 nm. The prototype has also been tested to perform measurements on optically rough surfaces. The rms error of these measurements was found to increase to around 4× that of the smooth surface. For the depth-resolved displacement field measurements, an experimental setup was designed and constructed in which a weakly-scattering sample underwent simple compression with a PZT actuator. Depth-resolved displacement fields were reconstructed from pairs of hyperspectral interferograms. However, the experimental results did not show the expected result of linear phase variation with depth. Analysis of several possible causes has been carried out with the most plausible reasons being excessive scattering particle density inside the sample and the possibility of insignificant deformation of the sample due to insufficient physical contact between the transducer and the sample.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Nissinen, I. (Ilkka). „CMOS time-to-digital converter structures for the integrated receiver of a pulsed time-of-flight laser rangefinder“. Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514295478.

Der volle Inhalt der Quelle

Annotation:

Abstract The aim of this thesis was to develop time-to-digital converters (TDC) for the integrated receiver of a pulsed time-of-flight (TOF) laser rangefinder aiming at cm-level accuracy over an input range of 10 m – 15 m. A simple structure, a high integration level and low power consumption are the desired features for such a TDC. From the pulsed TOF laser rangefinder point of view an integrated receiver consisting of both the TDC and the receiver channel on the same die offers the possibility of manufacturing these laser rangefinders with a high integration level and at a low price to fulfil the needs of mass industrial markets. The heart of the TDC is a CMOS ring oscillator, the clock frequency of which is used to calculate the full clock cycles between timing signals, the positions of the timing signals inside the clock period being determined by storing the state of the phase of the ring oscillator for each timing signal. This will improve the resolution of the TDC. Also, additional delay lines are used to generate multiple timing signals, each having a time difference of a fraction of that of the ring oscillator. This will further improve the resolution of the whole TDC. To achieve stable results regardless of temperature and supply voltage variations, the TDC is locked to an on-chip reference voltage, or the resolution of the TDC is calibrated before the actual time interval measurement. The systematic walk error in the receiver channel caused by amplitude variation in the received pulse is compensated for by the TDC measuring the slew rate of the received pulse. This time domain compensation method is not affected by the low supply voltage range of modern CMOS technologies. Three TDC prototypes were tested. A single-shot precision standard deviation of 16 ps (2.4 mm) and a power consumption of 5.3 mW/channel were achieved at best over an input range of 100 ns (15 m). The temperature drifts of an on-chip voltage reference-locked TDC and a TDC based on the calibration method were 90 ppm/°C and 0.27 ps/°C, respectively. The results also showed that a pulsed TOF laser rangefinder with cm-level accuracy over a 0 – 15 m input range can be realized using the integrated receiver with the time domain walk error compensation described here
Tiivistelmä Väitöskirjatyön tavoitteena oli kehittää aika-digitaalimuunninrakenteita valopulssin kulkuajan mittaukseen perustuvan lasertutkan integroituun vastaanottimeen. Tavoitteena oli saavuttaa senttimetriluokan tarkkuus 10 m – 15 m mittausalueella koko lasertutkan osalta. Aika-digitaalimuuntimelta vaaditaan yksinkertaista rakennetta, korkeaa integroimisastetta ja matalaa tehonkulutusta. Integroitu vastaanotin sisältää sekä aika-digitaalimuuntimen että vastaanotinkanavan ja tarjoaa mahdollisuuden korkeasti integroidun lasertutkan valmistukseen halvalla teollisuuden massamarkkinoiden tarpeisiin. Aika-digitaalimuuntimen ytimenä toimii monivaiheinen CMOS-rengasoskillaattori. Aika-digitaalimuunnos perustuu rengasoskillaattorin täysien kellojaksojen laskentaan laskurilla ajoitussignaalien välillä. Lisäksi rengasoskillaatorin jokaisesta vaiheesta otetaan näyte ajoitussignaaleilla niiden paikkojen määrittämiseksi kellojakson sisällä, jolloin aika-digitaalimuuntimen erottelutarkkuutta saadaan parannettua. Erottelutarkkuutta parannetaan lisää viivästämällä ajoitussignaaleja viive-elementeillä ja muodostamalla näin useita erillisiä ajoitussignaaleja, joiden väliset viive-erot ovat murto-osa rengasoskillaattorin viive-elementin viiveestä. Aika-digitaalimuunnin stabiloidaan käyttöjännite- ja lämpötilavaihteluja vastaan lukitsemalla se integroidun piirin sisäiseen jännitereferenssiin, tai sen erottelutarkkuus määritetään ennen varsinaista aikavälinmittausta erillisellä kalibrointimittauksella. Vastaanotetun valopulssin amplitudivaihtelun aiheuttama systemaattinen ajoitusvirhe integroidussa vastaanotinkanavassa kompensoidaan mittaamalla vastaanotetun valopulssin nousunopeus aika-digitaalimuuntimella. Tällainen aikatasoon perustuva kompensointimetodi on myös suorituskykyinen nykyisissä matalakäyttöjännitteisissä CMOS-teknologioissa. Työssä valmistettiin ja testattiin kolme aika-digitaalimuunninprototyyppiä. Muuntimien kertamittaustarkkuuden keskihajonta oli parhaimmillaan 16 ps (2,4 mm) ja tehonkulutus alle 5,3 mW/kanava mittausetäisyyden olessa alle 100 ns (15 m). Sisäiseen jännitereferenssiin lukitun aika-digitaalimuuntimen lämpötilariippuvuudeksi mitattiin 90 ppm/°C ja kalibrointimenetelmällä saavutettiin 0,27 ps/°C lämpötilariipuvuus. Työssä saavutetut tulokset osoittavat lisäksi, että valopulssin kulkuajan mittaukseen perustuvalla lasertutkalla on saavutettavissa senttimetriluokan tarkkuus 0 – 15 m mittausalueella käyttämällä tässä työssä esitettyä integroitua vastaanotinta ja aikatason ajoitusvirhekompensointia

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Piracha, Mohammad Umar. „A laser radar employing linearly chirped pulses from a mode-locked laser for long range, unambiguous, sub-millimeter resolution ranging and velocimetry“. Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5372.

Der volle Inhalt der Quelle

Annotation:

Light detection and ranging (lidar) is used for various applications such as remote sensing, altimetry and imaging. In this talk, a linearly chirped pulse source is introduced that generates wavelength-swept pulses exhibiting ~6 nm optical bandwidth with > 20 km coherence length. The chirped pulses are used in an interferometric lidar setup to perform distance measurements with sub-millimeter resolution (using pulses that are a few meters long), at target distances > 10 km, with at least 25 dB signal-to-noise ratio at the receiver. A pulse repetition rate of 20 MHz provides fast update rates, while chirped pulse amplification allows easy amplification of optical signals to high power levels that are required for long range operation. A pulse tagging scheme based on phase modulation is used to demonstrate unambiguous, long range measurements. In addition to this, simultaneous measurement of target range and Doppler velocity is performed using a target moving at a speed of over 330 km/h (205 mph) inside the laboratory. In addition to this, spectral phase modulation of the chirped pulses is demonstrated to compensate for the undesirable ripple in the group delay of the chirped pulses. Moreover, spectral amplitude modulation is used to generate pulses with Gaussian temporal intensity profiles and a two-fold increase in the lidar range resolution (284 um) is observed.
ID: 031001421; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Adviser: Peter J. Delfyett.; Title from PDF title page (viewed June 18, 2013).; Thesis (Ph.D.)--University of Central Florida, 2012.; Includes bibliographical references (p. 93-104).
Ph.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Macháček, Jan. „Fokusovací techniky optického měření 3D vlastností“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442511.

Der volle Inhalt der Quelle

Annotation:

This thesis deals with optical distance measurement and 3D scene measurement using focusing techniques with focus on confocal microscopy, depth from focus and depth from defocus. Theoretical part of the thesis is about different approaches to depth map generation and also about micro image defocusing technique for measuring refractive index of transparent materials. Then the camera calibration for focused techniques is described. In the next part of the thesis is described experimentally verification of depth from focus and depth from defocus techniques. For the first technique are shown results of depth map generation and for the second technique is shown comparison between measured distance values and real distance values. Finally, the discussed techniques are compared and evaluated.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Clement, Pierre. „Solutions aux limites des interrogateurs B-OTDR pour la surveillance d'infrastructures : augmentation de la portée de mesure et décorrélation des paramètres de température et de déformation“. Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT042.

Der volle Inhalt der Quelle

Annotation:

Cette thèse porte sur l’étude des systèmes de mesure répartie de la rétrodiffusion Brillouin dans une fibre optique, que l’on nomme B-OTDR et qui sont sensibles à la température et à la déformation de la fibre. Les solutions d'interrogateurs actuelles permettent l'instrumentation de grandes infrastructures. Cependant, il existe des limites, inhérentes au phénomène physique utilisé, qui ne permettent pas d'adresser certaines applications spécifiques. Ces limites portent sur la distance de mesure maximale accessible par ces interrogateurs mais également sur la décorrélation de la mesure des paramètres de température et de déformation. Nous avons donc cherché, au cours de cette thèse, à adresser des solutions à ces problématiques. Un nouveau système de ré-amplification optique, basé sur les technologies EDFA, a été mis au point. Associé à un système B-OTDR, cette solution nous a permis de réaliser une mesure distribuée de température sur 150 km de fibre avec une répétabilité de 1,5 °C. Cette avancée propose, à notre connaissance, les meilleurs résultats obtenus avec un tel système et nous permet d’envisager son déploiement pour la surveillance d’infrastructures du transport de l’énergie sur de longues distances. Nous avons dans un second temps conçu un nouvel interrogateur, utilisant la rétrodiffusion Brillouin, et permettant la décorrélation des mesures de température et de déformation sur une seule et unique fibre optique. Ce nouvel interrogateur, caractérisé et breveté durant cette thèse, a permis de réaliser une mesure indépendante de température et de déformation sur un câble spécifique inséré dans un puits de forage. Les résultats de ces mesures ont montré à la fois des variations de température et de déformation sur le câble, donnant des informations précieuses à l’opérateur du puits. Le nouvel interrogateur mis au point, permet une séparation de ces deux paramètres avec une répétabilité inférieure à 1 °C et 20 μm/m pour une distance de l’ordre du kilomètre. Pour des distances de l’ordre de la dizaine de kilomètres, la répétabilité de mesure est de 3 °C et 75 μm/m. Ce résultat fait l'état de l'art dans la séparation température/déformation par B-OTDR. Enfin, les différents travaux réalisés pour répondre à ces deux problématiques ont abouti au développement d’un prototype d’interrogateur qui laisse envisager une mesure simultanée de la température, de la déformation, des vibrations acoustiques et de la pression hydrostatique. Ce prototype conduit à des perspectives intéressantes pour une solution complète de surveillance d’infrastructures
This thesis deals with distributed optical fiber sensors, especially Brillouin sensors called B-OTDR that are sensitive both to temperature and strain. Some actual limitations due to the scattering phenomenon avoid deployment of this technology for some specific applications. These limitations are about the maximum length measured by the sensor but also the double sensitivity to strain and temperature. From our current B-OTDR sensor, we propose solutions to address these issues.A new re-amplification module using EDFA has been developed and characterized associated to a B-OTDR system. A 150 km distributed temperature measurement with 1,5 °C repeatability has been reached. This record performance let us consider a deployment for very long infrastructure monitoring for the energy transport. In another hand, we developed a new sensing device using Brillouin scattering and able to separate temperature and strain. This patented device has been characterized and used on a specific cable inserted in a well drilling. Results have shown a combination of strain and temperature variations on the cable that give very useful information to the well operator. We have reached a temperature repeatability of 1 °C and a strain repeatability of 20 μm/m for 1 km fiber. At 10 km, temperature repeatability has been evaluated to be 3 °C and strain to 75 μm/m. These results are to the state of art for temperature/strain separation using B-OTDR.These works have led to a new distributed measurement prototype that could address simultaneously temperature, strain, acoustic vibrations, and pressure sensing. Some interesting perspectives could result from these works to address a complete infrastructure monitoring using fiber optic sensing

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Fuhrland, Matthias. „Konzeption und Umsetzung neuer Technologien zur biaxialen Winkelmessung und elektrooptischen Pseudostreckenmessung“. Doctoral thesis, München : Verl. der Bayerischen Akad. der Wiss, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1201784888043-41278.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Fuhrland, Matthias. „Konzeption und Umsetzung neuer Technologien zur biaxialen Winkelmessung und elektrooptischen Pseudostreckenmessung“. Doctoral thesis, München Beck, 2007. http://d-nb.info/988973138/04.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Stefani, Mario Antonio. „Medidores de distância por triangulação a laser“. Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-19032009-093741/.

Der volle Inhalt der Quelle

Annotation:

Os Medidores de Distância por Triangulação a Laser são sistemas optoeletrônicos destinados à medição de pequenas distâncias ou deslocamentos, sem contato físico direto. Estes equipamentos possuem um grande campo de aplicações industriais. Este trabalho descreve as diversas configurações que este equipamento pode se apresentar, discutindo suas vantagens relativas. São estudadas também as suas partes e os componentes mais indicados. O projeto detalhado de um medidor usando sensor tipo CCD, e apresentado. Algumas aplicações industriais deste modelo são relatadas e diversos métodos e sugestões de uso são apresentadas, com base nas experiências realizadas pelo autor.
Laser Triangulation Rangefinders are non-contact, optoelectronic devices for measurement of small displacements or distances. These devices offer a broad range of industrial applications. This work explains common configurations, parts and main components, comparing their advantages. A detailed project on a CCD based Laser Rangefinder is presented. Some industrial applications for that project are related, discussing practical aspects based on authors experience. Some potential applications are also suggested.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Génevé, Lionel. „Système de déploiement d'un robot mobile autonome basé sur des balises“. Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD024/document.

Der volle Inhalt der Quelle

Annotation:

Cette thèse s’inscrit dans le cadre d’un projet visant à développer un robot mobile autonome capable de réaliser des tâches spécifiques dans une zone préalablement définie par l’utilisateur. Afin de faciliter la mise en œuvre du système, des balises radiofréquences fournissant des mesures de distance par rapport au robot sont disposées au préalable autour du terrain. Le déploiement du robot s’effectue en deux phases, une première d’apprentissage du terrain, puis une seconde, où le robot effectue ses tâches de façon autonome. Ces deux étapes nécessitent de résoudre les problèmes de localisation et de localisation et cartographie simultanées pour lesquels différentes solutions sont proposées et testées en simulation et sur des jeux de données réelles. De plus, afin de faciliter l’installation et d’améliorer les performances du système, un algorithme de placement des balises est présenté puis testé en simulation afin de valider notamment l’amélioration des performances de localisation
This thesis is part of a project which aims at developing an autonomous mobile robot able to perform specific tasks in a preset area. To ease the setup of the system, radio-frequency beacons providing range measurements with respect to the robot are set up beforehand on the borders of the robot’s workspace. The system deployment consists in two steps, one for learning the environment, then a second, where the robot executes its tasks autonomously. These two steps require to solve the localization and simultaneous localization and mapping problems for which several solutions are proposed and tested in simulation and on real datasets. Moreover, to ease the setup and improve the system performances, a beacon placement algorithm is presented and tested in simulation in order to validate in particular the improvement of the localization performances

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Bücher zum Thema "Optical distance measurement"

T, Neece Robert, und Langley Research Center, Hrsg. Reflectometer distance measurement between parallel conductive plates. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

Den vollen Inhalt der Quelle finden

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Proceedings of ODIMAP 3.: 3rd topical meeting on Optoelectronic distance/ displacement measurements ... Pavia: LEOS, 2001.

Den vollen Inhalt der Quelle finden

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Buchteile zum Thema "Optical distance measurement"

Rüeger, J. M. „Electro-Optical Distance Meters“. In Electronic Distance Measurement, 123–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-97196-9_9.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Rüeger, J. M. „Electro-Optical Distance Meters“. In Electronic Distance Measurement, 123–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80233-1_9.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Rüeger, J. M. „Errors of Electro-Optical Distance Meters“. In Electronic Distance Measurement, 174–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-97196-9_12.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Rüeger, J. M. „Calibration of Electro-Optical Distance Meters“. In Electronic Distance Measurement, 186–221. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-97196-9_13.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Rüeger, J. M. „Errors of Electro-Optical Distance Meters“. In Electronic Distance Measurement, 174–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80233-1_12.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Rüeger, J. M. „Calibration of Electro-Optical Distance Meters“. In Electronic Distance Measurement, 186–221. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80233-1_13.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Dändliker, R., und Y. Salvadé. „Multiple-Wavelength Interferometry for Absolute Distance Measurement“. In Springer Series in OPTICAL SCIENCES, 294–317. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-540-48886-6_19.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Haus, Hermann A. „Solitons and Long-Distance Fiber Communications“. In Electromagnetic Noise and Quantum Optical Measurements, 345–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04190-1_11.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Flores-Moreno, J. M., Cosme Furlong und John J. Rosowski. „Adaptative reconstruction distance in a lensless Digital Holographic Otoscope“. In Optical Measurements, Modeling, and Metrology, Volume 5, 229–34. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0228-2_27.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Rhodes, Edward J., Alessandro Cacciani und Steven Tomczyk. „Applications of the Magneto-Optical Filter to Stellar Pulsation Measurements“. In Seismology of the Sun and the Distant Stars, 359–75. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4608-8_40.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Konferenzberichte zum Thema "Optical distance measurement"

Kim, Seung-Woo, Ki-Nam Joo, Jonghan Jin und Yun Seok Kim. „Absolute distance measurement using femtosecond laser“. In Optical Metrology, herausgegeben von Heidi Ottevaere, Peter DeWolf und Diederik S. Wiersma. SPIE, 2005. http://dx.doi.org/10.1117/12.612238.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Boskovic, A. „Measurement of n“. In IEE Colloquium on High Speed and Long Distance Optical Transmission. IEE, 1996. http://dx.doi.org/10.1049/ic:19960565.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Barrau, Florian, Bruno Paille, Edith Kussener und Didier Goguenheim. „Distance measurement using narrowband ZigBee devices“. In 2014 23rd Wireless and Optical Communication Conference (WOCC). IEEE, 2014. http://dx.doi.org/10.1109/wocc.2014.6839958.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Bhattacharya, N., M. Cui, M. G. Zeitouny, H. P. Urbach und S. A. van den Berg. „Long distance measurement with submicrometer accuracy“. In International Conference on Optical Instruments and Technology (OIT2011). SPIE, 2011. http://dx.doi.org/10.1117/12.916790.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Han, Seongheum, Seungman Kim, Jeong-Seok Oh, Seung-Kook Ro und Seung-Woo Kim. „Absolute distance measurement system for precise 3D positioning“. In Applied Optical Metrology III, herausgegeben von Erik Novak und James D. Trolinger. SPIE, 2019. http://dx.doi.org/10.1117/12.2528389.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Li, Mengchao, Songlin Zhuang, Gang Zheng, Ling Zhang und Xiaorong Zhao. „Distance measurement using internal cavity interferometer“. In SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, herausgegeben von H. Philip Stahl. SPIE, 1999. http://dx.doi.org/10.1117/12.369220.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Liu, H. L., W. H. Chung, H. Y. Fu und H. Y. Tam. „A Novel FBG Sensor Configuration for Long-Distance Measurement“. In Optical Fiber Sensors. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/ofs.2006.the28.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Lay, Oliver P., Serge Dubovitsky, Robert D. Peters, Johan Burger, Seh-Won Ahn, William H. Steier, Harold R. Fetterman und Yian Chang. „Absolute distance measurement with the MSTAR sensor“. In Optical Science and Technology, SPIE's 48th Annual Meeting, herausgegeben von Jennifer E. Decker und Nicholas Brown. SPIE, 2003. http://dx.doi.org/10.1117/12.503760.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Syvenkyy, Yuriy, Brian Dewan, Mike Feaver und Shu Benson Ip. „Commercial Phosphorescence Fiber-Optic Sensor for Long Distance Temperature Measurement“. In Optical Fiber Sensors. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/ofs.2018.the4.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Hafidi, Abdeslam, Pierre Pfeiffer und Patrick Meyrueis. „Tunable laser diode for absolute distance measurement“. In SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, herausgegeben von Ryszard J. Pryputniewicz, Gordon M. Brown und Werner P. O. Jueptner. SPIE, 1998. http://dx.doi.org/10.1117/12.316466.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Berichte der Organisationen zum Thema "Optical distance measurement"

Forman, P. R. Final report on Task 8: Status report on producing pre-twisted optical fibers and status report on remote optical distance measurement. Office of Scientific and Technical Information (OSTI), September 1998. http://dx.doi.org/10.2172/314119.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Wir bieten Rabatte auf alle Premium-Pläne für Autoren, deren Werke in thematische Literatursammlungen aufgenommen wurden. Kontaktieren Sie uns, um einen einzigartigen Promo-Code zu erhalten!