Volatile organic compounds (VOC) gas leak detection by using infrared sensors

buir.advisorÇetin, A. Enis
dc.contributor.authorErden, Fatih
dc.date.accessioned2016-01-08T18:10:42Z
dc.date.available2016-01-08T18:10:42Z
dc.date.issued2009
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2009.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2009.en_US
dc.descriptionIncludes bibliographical references leaves 63-66.en_US
dc.description.abstractAdvances in technology and industry leads to a rise in the living standards of people. However, this has also introduced a variety of serious problems, such as the undesired release of combustible and toxic gases which have become an essential part of domestic and industrial life. Therefore, detection and monitoring of VOC gases have become a major problem in recent years. In this thesis, we propose novel methods for detection and monitoring VOC gas leaks by using a Pyro-electric (or Passive) Infrared (PIR) sensor and a thermopile sensor. A continuous time analog signal is obtained for both of the sensors and sent to a PC for signal processing. While using the PIR sensor, we have Hidden Markov Models (HMM) for each type of event to be classified. Then, by using a probabilistic approach we determine which class any test signal belongs to. In the case of a thermopile sensor, in addition to Hidden Markov Modeling method, we also use a method based on the period of the sensor signal. The frequency of the output signal of the thermopile sensor increases with the presence of VOC gas leak. By using this fact, we control whether the period of a test signal is below a predefined threshold or not. If it is, our system triggers an alarm. Moreover, we present different methods to find the periods of a given signal.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T18:10:42Z (GMT). No. of bitstreams: 1 0003850.pdf: 837863 bytes, checksum: 1d155c279e6b48734f91fadc8b54ad16 (MD5)en
dc.description.statementofresponsibilityErden, Fatihen_US
dc.format.extentxiii, 66 leaves, illustrationsen_US
dc.identifier.urihttp://hdl.handle.net/11693/14900
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectVOC gas leak detectionen_US
dc.subjectpyro-electric infrared (PIR) sensoren_US
dc.subjectthermopile sensoren_US
dc.subjectwavelet transform,en_US
dc.subjectHidden Markov Models (HMM)en_US
dc.subjectanalysis of periodic signalen_US
dc.subject.lccTD885.5.O74 E73 2009en_US
dc.subject.lcshVolatile organic compounds--Analysis.en_US
dc.subject.lcshVolatile organic compounds--Environmental aspects.en_US
dc.subject.lcshInfrared detectors.en_US
dc.subject.lcshInfrared technology.en_US
dc.subject.lcshSensors.en_US
dc.subject.lcshGas-detectors.en_US
dc.titleVolatile organic compounds (VOC) gas leak detection by using infrared sensorsen_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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