Дисертації з теми "Wireless gas sensor"
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Smith, Clinton James. "High-accuracy laser spectrometers for wireless trace-gas sensor networks." Thesis, Princeton University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3604506.
Повний текст джерелаThe subject of this dissertation is the development of a wireless sensor network composed of instruments which employ both VCSELs and QCLs for accurate, highly sensitive, and reliable long-term monitoring of environmental trace-gases. The dissertation focuses on the development of low-power instruments and calibration methods that ensure the reliability of long-term measurements.
First the field deployment of a low-power, portable, wireless laser spectroscopic sensor node for atmospheric CO2 monitoring is demonstrated. The sensor node shows 0.14 ppmv Hz-1/2 1σ measurement sensitivity of CO2 concentration changes. It was first used to measure top-soil respiration rates in the laboratory and on forest floors in the field.
Then after a long-term field deployment to further assess instrument performance, new design solutions were implemented to improve fringe-limited precision of the nodes to 4-7 ppmv against a 400 ppmv CO2 background, making their performance comparable to higher power consuming commercial trace-gas analyzers. Three optimized nodes were then deployed into mixed landscapes as part of a solar powered CO2 monitoring wireless network. The three node network monitored CO2 in a grassy/woody courtyard, on top of the roof of an engineering building, and next to a road in the Princeton area. These works show that ultra-low powered VCSEL based sensor nodes can be placed in off-the-grid environments for autonomous distributed geographic monitoring of trace-gases in a manner which is impossible with current commercial techniques.
Next, this dissertation covers two techniques that were developed for the real-time calibration of laser-based trace-gas measurements. The first technique used an in-line reference gas cell and employed wavelength modulation spectroscopy (WMS) at higher harmonics to simultaneously probe the sample and reference spectra. The second technique used a revolving in-line reference cell to suppress background and other non-spectroscopic signals. These techniques were designed for eventual inclusion as a real-time calibration source for field deployable trace-gas sensors and wireless sensor networks.
Finally, this dissertation demonstrates the use of the CW injection current into a VCSEL in an external cavity configuration to tune the cavity emission's self-oscillation frequency and show through simulation and experiment that the tuning is dependent on VCSEL birefringence change.
Kihlberg, David, and Amir Ebrahimi. "Wireless Gas Sensor Nodes : With focus on Long Range (LoRa) communication." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-168669.
Повний текст джерелаCobb, Derrick Ian. "Transimpedance-Based and Low-Power Bias Wireless PPB Hydrogen Gas Sensor." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386074227.
Повний текст джерелаAbhijith, N. "Semi Conducting Metal Oxide Gas Sensors: Development And Related Instrumentation." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/281.
Повний текст джерелаBorkar, Chirag. "Development of Wireless Sensor Network System for Indoor Air Quality Monitoring." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177181/.
Повний текст джерелаLama, Audrey. "Interactive Wireless Sensor for Remote Trace Detection and Recognition of Hazardous Gases." TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1308.
Повний текст джерелаAl-Hawashem, Kamal. "Highly reliable and delay bound wireless sensor network protocol for oil and gas plants." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28218.
Повний текст джерелаFisher, Brian. "Surface Acoustic Wave (SAW) Cryogenic Liquid and Hydrogen Gas Sensors." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5208.
Повний текст джерелаPh.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Obiora, Obinna Chukwuemeka. "Wireless condition monitoring to reduce maintenance resources in the Escravos–Gas–To–Liquids plant, Nigeria / Obiora, O.C." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7040.
Повний текст джерелаThesis (M.Ing. (Development and Management Engineering))--North-West University, Potchefstroom Campus, 2012.
Malaver, Rojas Jairo Alexander. "Development of gas sensing technology for ground and airborne applications powered by solar energy : methodology and experimental results." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/74644/1/74644.pdf.
Повний текст джерелаBhadra, Sharmistha. "Electrode-based wireless passive pH sensors with applications to bioprocess and food spoilage monitoring." IEEE, 2011. http://hdl.handle.net/1993/30366.
Повний текст джерелаSilva, Ivanovitch Medeiros Dantas da. "An?lise de desempenho de sistemas de comunica??o sem-fio para monitoramento de unidade de produ??o de po?os petrol?feros terrestres." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15199.
Повний текст джерелаCoordena??o de Aperfei?oamento de Pessoal de N?vel Superior
The greater part of monitoring onshore Oil and Gas environment currently are based on wireless solutions. However, these solutions have a technological configuration that are out-of-date, mainly because analog radios and inefficient communication topologies are used. On the other hand, solutions based in digital radios can provide more efficient solutions related to energy consumption, security and fault tolerance. Thus, this paper evaluated if the Wireless Sensor Network, communication technology based on digital radios, are adequate to monitoring Oil and Gas onshore wells. Percent of packets transmitted with successful, energy consumption, communication delay and routing techniques applied to a mesh topology will be used as metrics to validate the proposal in the different routing techniques through network simulation tool NS-2
Grande parte do monitoramento de po?os petrol?feros terrestres realizados atualmente est? baseado em solu??es sem fio (wireless). Todavia, essas solu??es apresentam uma configura??o defasada tecnologicamente na medida em que s?o utilizados r?dios anal?gicos e topologias de comunica??o ineficientes. Por outro lado, tecnologias que adotam r?dios digitais podem proporcionar solu??es mais eficientes relacionadas com o consumo de energia, seguran?a e toler?ncia a falhas. O trabalho investiga se as Redes de Sensores Sem Fio, tecnologia de comunica??o que utiliza r?dios digitais, s?o adequadas para o monitoramento de po?os petrol?feros terrestres. Porcentagem de pacotes entregues com sucesso, consumo de energia, atrasos de comunica??o e t?cnicas de roteamento para uma topologia em malha s?o as m?tricas usadas para validar a proposta atrav?s da ferramenta de simula??o NS-2
Rimer, Suvendi Chinnappen. "Energy efficient communication models in wireless sensor and actor networks." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/23253.
Повний текст джерелаThesis (PhD(Eng))--University of Pretoria, 2012.
Electrical, Electronic and Computer Engineering
unrestricted
Mohammadi, Saeed. "Phononic band gap micro/nano-mechanical structures for wireless communications and sensing applications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41069.
Повний текст джерелаLu, Bin. "Energy Usage Evaluation and Condition Monitoring for Electric Machines using Wireless Sensor Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14152.
Повний текст джерелаBabb, Jeffrey Ross. "BRIDGING THE GAP BETWEEN PUBLIC VISITORS AT LACAWAC SANCTUARY AND LAKE RESEARCHERS: DEVELOPING OUTREACH MATERIALS ON ADVANCED ENVIRONMENTAL SENSORS." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1375723733.
Повний текст джерелаKuo, Lu-Chung, and 郭儒璋. "A development on the wireless SAW gas sensor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/63784442286378713042.
Повний текст джерела國立臺灣大學
應用力學研究所
103
For the sake of human safety and industry applications, the gas detection is gradually taken seriously. CO is one of the most harmful pollutants which is colorless, odorless and tasteless. When human inhale the CO, it could cause the symptoms of headaches, dizziness and even death. Furthermore, CO is able to poison the noble metals making poor performance on the catalyst like Pt used in fuel cells. Hence, monitoring the condition of hydrogen gas is important for environmental protection and human safety. The CO SAW sensor is developed for its stability, sensitivity, convenience and low cost. In this thesis, the SAW resonator component was based on 128˚YX-LiNbO3 and the operating frequency was designed as 433MHz. The senor can operate at room temperature without a heater. It is available to combine the antenna with the SAW device to be a passive wireless SAW sensor. With mobile device, the sensor can link up with wireless system and monitor in real-time. First, the impedance load sensor and SAW resonator were designed according to the couple of mode(COM) and fabricated by MEMS technique. For higher sensitivity and better surface-area-to-volume ratio, the zinc oxide nanorod was used to be as sensing material. Furthermore, the gold particle decorated ZnO nanorod as a catalyst for strengthening the sensitivity of carbon monoxide. Second, the signal of the impedance loaded SAW sensor was analyzed in signal processing. Finally, the wireless passive sensor was completed by combining with an antenna. Besides, the sensing distance of the passive sensor could be increased by power amplify applying background reflection.
Lo, Jing-Pin, and 羅京聘. "High-Selectivity Multiple-Gas Sensing Module for Wireless Sensor Network System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/10762217967315261799.
Повний текст джерела國立臺灣大學
電子工程學研究所
97
Home Safety has always been one of the objectives pursued. With the advances in technology and sensor technology, people at any time to monitor changes in the environment around them and make up with contingency measures in a timely manner to prevent disasters from happening. For example, in the life of the gas is one of the important energy and cooking or day-to-day use of hot water. However, that neglect could cause carbon monoxide poisoning or gas explosion incident. Therefore, how we can make good use of the gas sensing system to provide real-time early warning sensor for carbon monoxide leakage detection, or too confined caused by the sharp drop in oxygen to give warning predictable and effective to reduce the accident rate that is an important issue. General commercial gas sensor alarm system is employed most of the cable transmission, through the transmission line into the future implementation of data transmission, so in the construction, design and cost-employed on a more convenient and not expensive. In order to improve the shortcomings of this paper the direction of research for the combination of carbon monoxide (CO), carbon dioxide (CO2), methane (CH4) gas combined with high-selectivity multiple-gas sensing module for wireless sensor network system. By composite gas sensors to monitor environmental changes in the gas and with wireless transmission technology, to monitor the information sent to the Center for the Analysis of the data processing, once the monitoring of environmental changes in the concentration of gas will be issued warning message to avoid disaster Took place to achieve real-time monitoring of management
Hu, Gushin, and 胡家信. "Using Wireless Sensor Network On Hydrogen Sulfide Monitoring System For The Oil And Gas Industry." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/32868155653498783140.
Повний текст джерела義守大學
資訊工程學系碩士在職專班
100
In recent years, there have been more and more petroleum industry accidents in Taiwan. Most of accidents were happened due to leakage of flammable gas piping, so the industry adopts wired monitoring systems to prevent such accidents. However, wired monitoring systems have some drawbacks such as huge consumption of wires, high maintenance costs, difficulty of installment and inflexibility, resulting in ineffective sensing of gas leakage. Recent advances in wireless technology have enabled the development of low-power, low-cost, low-rate, low-complexity wireless sensor nodes. WSN (wireless sensor network, WSN) has been well developed in recent years and widely applied to home automation, health care, remote control, natural environment monitoring, etc. WSN enables a cost-efficient means to provide additional measurement points through the elimination of cables and the possibility of sensing into areas that are too remote or hostile for wired systems. In this paper, the wireless sensor network will be used to improve existing wired sensing system. We proposed a wireless Hydrogen Sulfide Monitoring System to detect the leakage of Hydrogen Sulfide piping and provide relevant people with available information.