A pressure measurement and compensation technique was studied by employing a 3.291 μm Continuous Wave (CW) Interband Cascade Laser (ICL) and a dense-patterned Multipass Gas Cell (MPGC) with an effective optical path ...A pressure measurement and compensation technique was studied by employing a 3.291 μm Continuous Wave (CW) Interband Cascade Laser (ICL) and a dense-patterned Multipass Gas Cell (MPGC) with an effective optical path length of 54.6 m. The pressure inside the MPGC was measured based on direct Lorentzian absorption line fitting on the measured absorption spectral signal of CH4, and then pressure compensation was made on the masured CH4 concentration. Pressure calibration was performed from 1.33 ×10^(4) Pa to 10.64 ×10^(4) Pa using a 2.1×10^(6)CH4 sample. An Allan deviation analysis of the measured pressure of a 2.1×10^0 6 CH4 at 9.31×10^(4) Pa pressure indicates a measurement precision of -219.5 Pa with a 2. 2 s averaging time. Fiveteen groups of pressure/concentration measurements of 1.0 ×10^(-6), 1.2×10^(-6), 1.4×10^(-6), 1.6×10^(-6)and 2.1×10^(-6)CH4 samples at different pressures of 1.33×10^(4), 3.99×10^(4) and 6.65 ×10^(4) Pa were performed, and the results proved the feasibility of the proposed pressure measurement and compensation technique.展开更多
基金The National Key R&D Program of China(Nos.2016YFD0700101,2016YFC0303902,2017YFB0402800)National Natural Science Foundation of China(Nos.61775079,61627823,61307124)+1 种基金Science and Technology Department of Jilin Province of China(Nos.20140307014SF20140307014SF,2017C027)Changchun Municipal Science and Technology Bureau(No.14KG022)
文摘A pressure measurement and compensation technique was studied by employing a 3.291 μm Continuous Wave (CW) Interband Cascade Laser (ICL) and a dense-patterned Multipass Gas Cell (MPGC) with an effective optical path length of 54.6 m. The pressure inside the MPGC was measured based on direct Lorentzian absorption line fitting on the measured absorption spectral signal of CH4, and then pressure compensation was made on the masured CH4 concentration. Pressure calibration was performed from 1.33 ×10^(4) Pa to 10.64 ×10^(4) Pa using a 2.1×10^(6)CH4 sample. An Allan deviation analysis of the measured pressure of a 2.1×10^0 6 CH4 at 9.31×10^(4) Pa pressure indicates a measurement precision of -219.5 Pa with a 2. 2 s averaging time. Fiveteen groups of pressure/concentration measurements of 1.0 ×10^(-6), 1.2×10^(-6), 1.4×10^(-6), 1.6×10^(-6)and 2.1×10^(-6)CH4 samples at different pressures of 1.33×10^(4), 3.99×10^(4) and 6.65 ×10^(4) Pa were performed, and the results proved the feasibility of the proposed pressure measurement and compensation technique.
