New method of gas concentration measurement based on continuous wave cavity ring-down

Qiuxia Yang; Zhiquan Li

doi:10.1117/12.863841

11 October 2010 New method of gas concentration measurement based on continuous wave cavity ring-down

Qiuxia Yang, Zhiquan Li

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 76561Q (2010) https://doi.org/10.1117/12.863841
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

The basic principles of the fiber-circled cavity ring-down spectroscopy were described. A new gas measurement system based on the fiber-circled cavity ring-down spectroscopy using continuous wave (CW) laser was designed and constructed. And the precise research about the principles and functions of the main devices was made during the designing process. Through analyzing the change of loss before and after filling H2S gas, know that the insertion loss cannot exceed 0.01dB.Because gain fluctuation of erbium doped fiber amplifier(EDFA) seriously influences measurement accuracy, a method which stabilizes the gain of EDFA was introduced, and the change of gain stability characteristics was compared. After adding the feedback loop, the gain changes within 0.01dB, and the measuring precision is 1ppm. The decay characteristics of H₂S gas with different concentrations and the empty cavity at different loss levels were obtained. From the experiment results, as the gas concentration increased, the decay time declined. Influencing factors on measurement precision were analyzed, and a new method for the high accuracy gas concentration in-situ measurement was proposed.

Citation Download Citation

Qiuxia Yang and Zhiquan Li "New method of gas concentration measurement based on continuous wave cavity ring-down", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76561Q (11 October 2010); https://doi.org/10.1117/12.863841

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