Pulsed multi-channel photoacoustic spectrometry device for gas detection

A pulsed multi-channel photoacoustic spectrometry device for gas detection mainly comprises a light source module, an optoacoustic signal generating module and a controlling and signal processing module, wherein under modulation of electric pulses generated by the controlling and signal processing module, an infrared source in a light source module emits pulsed beams which are reflected by a parabolic reflector to form parallel beams, and the parallel beams are sent to the optoacoustic signal generating module. The optoacoustic signal generating module comprises a plurality of cylindrical optoacoustic cavities, and the axes of the optoacoustic cavities are in circumferential array distribution around the optical axis of the light source module, so that the light intensities of the beams sent into the optoacoustic cavities are the same. An optical filter is mounted at the light-in hole of each optoacoustic cavity, and a light deflector is mounted at each light-out hole. Optoacoustic sensors corresponding to the optoacoustic cavities are mounted in the middles of the optoacoustic cavities, generated optoacoustic signals are transmitted to the controlling and signal processing module through signal cables, and the concentration values of all gases are calculated.