Enhanced multi-group photoacoustic spectrum gas sensing device based on quartz tuning fork
A technology of quartz tuning fork and photoacoustic spectroscopy, which is applied in the directions of measuring devices, color/spectral characteristic measurement, and material analysis, etc. It can solve the problems that are not conducive to obtaining the absolute concentration of gas, achieve easy capture, reduce volume, and realize online self-calibration Effect
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[0033] Such as figure 1 As shown, a multi-component photoacoustic spectroscopy gas sensing device enhanced by a quartz tuning fork includes a laser 1, a fiber amplifier 3, a fiber coupler 4, a collimator 5, a focusing lens 6, a gas cell 10, a reference cell 13, The first detector 14, the second detector 22, the preamplifier circuit module 15, the lock-in amplifier 16, and the signal acquisition and control unit 17; the gas pool 10 is filled with the gas to be measured, and the gas to be measured is CO 2 And NH 3 , The device is used to measure CO 2 And NH 3 concentration;
[0034] The gas cell 10 is equipped with a micro resonance capillary 11 and a quartz tuning fork 12, and the gas cell 10 has a first CaF 2 Window 7, the second CaF 2 Window 23, air inlet 8 and air outlet 9; the first CaF 2 Window 7 is located on the left side wall of gas pool 10, the second CaF 2 The window 23 is located on the right side wall of the gas pool 10; the gas inlet 8 and the gas outlet 9 are both loc...
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