Spectroscopy and Spectral Analysis, Volume. 38, Issue 4, 1031(2018)
Calibration Method of Pressure Gauges Based on Cavity Ring-Down Spectroscopy Technique
The accurate measurement of pressure is of great importance to industry process control. In absorption spectroscopy, the spectral line profile and line-width of gas depend on the molecular interactions, temperature, pressure and other factors. The pressure induced line- broadening effect of narrow-band absorption lines of gases can be used for pressure measurement and calibration. A novel pressure gauge calibration method based on cavity ring-down spectroscopy (CRDS) and pressure induced line-broadening effect is presented and experimentally demonstrated at room temperature with a CRDS setup employing a 5.2 μm tunable quantum cascade laser and an absorption line of trace moisture in air near 1 877 cm-1 wavenumber. The measured line-width is 0.084 21 cm-1, and the corresponding pressure is 98.12 kPa, which is in good agreement with a high-precision pressure gauge reading 98.14 kPa. A pressure measurement limit of 0.18 kPa is achieved, estimated from the line-width measurement uncertainty. In addition, the measured pressure broadening coefficient is (0.087 12±0.000 965) cm-1·atm-1, which is in good agreement with the reference value 0.087 1 cm-1·atm-1 given by HITARN database at the same temperature. The proposed method is applied to calibrate a small-scale pressure gauge with sufficient accuracy. The results indicate that high-resolution measurement of absorption line based on CRDS has the potential for high-accuracy pressure measurement and calibration.
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ZHOU Sheng, HAN Yan-ling, LI Bin-cheng. Calibration Method of Pressure Gauges Based on Cavity Ring-Down Spectroscopy Technique[J]. Spectroscopy and Spectral Analysis, 2018, 38(4): 1031
Received: Dec. 30, 2016
Accepted: --
Published Online: Jun. 12, 2018
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