Title :
Fiber optic methane sensing system based on wavelength modulation spectroscopy by using logarithm method
Author :
Cai, Haiwen ; Yuntao Wang ; Geng, Jianxin ; Fang, Zujie
Author_Institution :
Shanghai Inst. of Opt. & Fine Mech., Chinese Acad. of Sci., Shanghai
Abstract :
A new method based on logarithm calculation for wavelength modulation spectroscopy is proposed and analyzed. It is shown that in the algorithm the second harmonic signal keeps linear relation with the gas concentration in the whole concentration scale. A fiber optic methane sensing system with much higher SNR was built.
Keywords :
fibre optic sensors; gas sensors; optical harmonic generation; optical modulation; organic compounds; fiber optic methane sensing; gas concentration; logarithm method; second harmonic signal; wavelength modulation spectroscopy; Absorption; Amplitude modulation; Gallium arsenide; Nonlinear equations; Optical fibers; Optical modulation; Optical propagation; Optical sensors; Spectroscopy; Tunable circuits and devices;
Conference_Titel :
Lasers and Electro-Optics - Pacific Rim, 2007. CLEO/Pacific Rim 2007. Conference on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-1173-3
Electronic_ISBN :
978-1-4244-1174-0
DOI :
10.1109/CLEOPR.2007.4391668
