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11 October 2010 Research on fiber-optic sensors for methane detection based on Harmonic detection
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In this paper, a sylstem of fiber-optic gas sensor based methane absorption spectra is studied. The system have made great improvement and in-depth analysis in methane spectral absorption,a weak optical signal extraction and processing and gas measurement accuracy.The system consists of light source, Photonic Crystal Fiber, air chamber, photoelectric detectors and signal processing components and so on. According to the Lambert-Beer law, spectrum absorption intensity is closely relate with the concentration of the gas. In order to ensure the system at a high resolution and sensitivity,The system used distributed feedback semiconductor laser (DFBLD) as a light source .It bring useful information of the optical signal to PIN Photodetector which then convert the optical signal to electrical signals after optical interacting with the methane gas,then send the electrical signal to lock-in amplifier.the harmonic detection of gas concentration was achieved by the light modulator, And then compared the harmonic component. Finally, the signal expected was produced through the A / D converter digital in the computer.
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Shutao Wang, Liang Huang, Zhishuang Zhou, and Zhihui Zhu "Research on fiber-optic sensors for methane detection based on Harmonic detection", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76562U (11 October 2010);


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