Cavity attenuated phase shift spectroscopic detection method and device for gas based on software phase locking
A gas detection and software lock technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of the lock-in amplifier and the arbitrary waveform generator being bulky, inconvenient to carry, and limited.
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[0071] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0072] Such as figure 1 As shown, in the embodiment of the present invention, the cavity attenuation phase-shift spectroscopy gas detection device based on software phase-locking includes LED 11, a temperature control module 20 for LED and photodetector temperature control, and the optical components of the present invention include a plano-convex lens 12, a resonant Cavity 133, a high reflection mirror 131, another high reflection mirror 132, a plano-convex lens 14, an interference filter 15; the gas circuit components of the present invention include a mass flow meter 31, a purge air inlet 321, another blow Sweep air inlet 322, a three-way air valve 33, a gas filter 34, a mass flow meter 37, a sampling pump 38; the circuit components of the present invention include a photodetector 41, a data acquisition card 42, and an LED driver 43 , a computer 4...
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