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Research on Fiber-Optic Gas Sensor Based on the Fabry-Perot Cavity

Author: CaoYanPeng
Tutor: ZhangJingChao
School: Yanshan University
Course: Optics
Keywords: Spectral absorption Frequency Modulation Optical fiber gas sensor Fabry-Perot cavity Piezoelectric ceramic (PZT) Methane
CLC: TP212.14
Type: Master's thesis
Year: 2010
Downloads: 133
Quote: 1
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Abstract


Optical gas detection technology is a kind of optical signal as a carrier, optical fiber signal transmission channel high sensitivity gas detection technology. Papers for the purpose of methane gas detection , spectral absorption principle -based fiber-optic methane gas sensing technology. Because of different molecular structure , each gas molecule has its inherent absorption spectrum , emission spectrum of the light source cover if the gas absorption peak of the light through the gas will occur at a specific wavelength is strongly absorbed , and the absorption intensity gas concentration for , by measuring the output light intensity can be measured gas concentration. Paper introduces the gas detection commonly used method, through a comparative analysis of the advantages and disadvantages of various methods of optical gas sensor research status and development trends , we chose as a gas absorption method detection method . Through the analysis of the theory of molecular spectroscopy , gas absorption measurement gives the theoretical basis and identified near-infrared methane absorption lines , its absorption characteristics were analyzed to establish the mathematical model for the sensor to lay the theoretical foundation. Secondly , elaborated methane detection system optical path section , the photoelectric conversion part and signal processing module characteristics and the impact on measurement accuracy . Proposed the use of Fabry-Perot cavity combined piezoelectric ceramic (PZT) on a broadband light source (SLD) filtering, extraction of the second harmonic measurement of gas concentrations approach. Finally, the light source for methane detection system Fabry-Perot cavity filter devices to study and use their spectrum MATLAB simulation, analysis FP cavity length and the output light wavelength, peak transmittance and cavity loss parameters such relationship for a reasonable choice of Fabry -Perot cavity design parameters to provide guidance. Followed by analysis and simulation of FBG optical properties for the rational selection of FBG calibration Fabry-Perot cavity output light frequency reference. In the present experimental conditions, the light source spectral characteristics of near-infrared absorption characteristics of methane , methane concentration detection and system repeatability and stability was investigated experimentally .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Physical sensors > Light sensor
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