Transactions of Nanjing University of Aeronautics & Astronautics
Cavity Ring-Down Spectroscopy Measurements of Trace H2S in SF6 and SF6/N2 Mixture
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Abstract:
H2S is one of the most important characteristic decomposition components of SF6 insulated gas， and the detection of trace H2S is significant for early fault diagnosis of gas insulated electrical equipment. A 1 578 nm wavelength distributed feedback diode laser （DFB-DL） based cavity ring-down spectroscopy （CRDS） experimental platform is developed to monitor the concentrations of H2S in SF6 and SF6/N2 mixture carrier gas. The detection sensitivity is higher than 1×10-6. The absorption cross section parameter σ is vital for calculating the concentration. With repeated experiments using standard gas samples， parameter σ of H2S in pure SF6 and SF6/N2 mixture carrier with different mixing ratios is calibrated. Compared with the simulated σ values， the influence of carrier gas on the broadening of spectral profile is discussed. The variation of absorption cross section σ with different carrier gas mixing ratios is studied as well， so that the calculation of the concentration in the carrier gas of any mixing ratio is possible. Thus， the application of CRDS in trace component detection of gas insulated electrical equipment is promising.
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Project Supported:
This work was supported in part by the National Key R&D Program of China （No.2021YFF0603100）， and in part by the Leading Innovation and Entrepreneurship Team in Zhejiang Province （No.2019R01014）.
Clc Number:
O433
CHINA AERO-SCIENCES
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