Gas concentration detection device based on direct laser absorption detection method

The invention discloses a gas concentration detection device based on a direct laser absorption detection method and belongs to the field of gas concentration detection. The detection device comprisesa laser emission module, an air chamber detection module, a photoelectric detection module, a digital oscilloscope and a computer, wherein the laser emission module and the photoelectric detection module are located at two ends of the air chamber detection module respectively, laser beams emitted by the laser emission module can penetrate through the air chamber detection module to irradiate thephotoelectric detection module, the photoelectric detection module is in signal connection with an input end of the digital oscilloscope, and the digital oscilloscope is in signal connection with thecomputer. The detection device is advantaged in that effectiveness of a noise reduction method on ammonia gas concentration inversion is analyzed, an original absorption spectral line signal is preprocessed by adopting a three-