Development of CO2 gas analyzer based on continuous wave
cavity ring-down spectroscopy

doi:10.3969/j.issn.1007-5461.2021.05.007

Abstract

Abstract: Continuous wave cavity ring-down spectroscopy (CW-CRDS) can be utilized in high sensitive trace gas detection. Based on CW-CRDS, using near-infrared distributed feedback diode laser (DFB-DL), semiconductor optical amplifier (SOA), and self-designed high-finesse Fabry-Perot cavity, laser driver and threshold detection circuit, the compact design of trace gas analyzer have been realized. In the system, SOA not only amplifies the laser power and improves the signal-to-noise ratio of ring-down signal, but also acts as an optical switch to trigger the ring-down time. The whole system is integrated in a 700 mm × 300 mm × 185 mm customized cabinet. Based on this device, CO2 gas is measured at 6359.97 cm−1, and the time series analysis results of the empty cavity ring-down time shows that the detection limit of the system is 3.85×10−8 cm−1.

Key words: spectroscopy, gas analyzer, cavity ring-down spectroscopy, CO2 gas detection, distributed feedback diode laser

CLC Number:

O433.4

MA Weiguang, ZHOU Xiaobin, CAO Zhensong, XU Fei, TIAN Jianfei, ZHOU Yueting, LIU Jianxin, ZHAO Gang, ∗. Development of CO₂ gas analyzer based on continuous wave cavity ring-down spectroscopy[J]. Chinese Journal of Quantum Electronics, 2021, 38(5): 633-640.

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Development of CO₂ gas analyzer based on continuous wave cavity ring-down spectroscopy

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