Research on Trace Gas Spectral Measurement on Intra-Cavity Fiber Optic Laser
ZHANG Hong-xia1,2, LIU Kun1,2*, JIA Da-gong1,2, LIU Tie-gen1,2, PENG Gang-ding1,3, WANG Yan1，ZHANG Yi-mo1,2
1. College of Precision Instrument & Opto-electronics Engineering, Tianjin University, Tianjin 300072, China 2. Key Laboratory of Opto-electronics Information and Technology (Tianjin University), Ministry of Education, Tianjin 300072, China 3. School of Electrical Engineering and Telecommunications, UNSW, Sydney NSW 2052, Australia
Abstract：Due to the advantages of immunity of electrical/electronic, high performance cost ratio, remote detection and multiplexing capability, intra-cavity fiber optic gas measurement has aroused wide concern. The trace gas measurement system has been developed based on the elaborated gas cell and reflector. The wavelength sweeping technique (WST) is realized when the Fabry-Perot type tunable optical filter is applied by the sawtooth driver voltage. Multi absorption lines can be obtained and one scanning measurement with WST is equal to multiple independent detections, so the gas measurement sensitivity is improved remarkably. The experimental results show that the acetylene detection sensitivity is reduced to less than 100 ppm and the relative measurement error is less than 3％ of practical gas concentration.
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