The invention discloses an active air-chamber structure and photoacoustic spectrometry gas
sensing system. The active air-chamber structure and photoacoustic spectrometry gas
sensing system comprises an integrated
light source, a
photoacoustic cell, a
microphone, a photoelectric detection module, a
signal processing module, a
light source control module and a data output module; the integrated
light source and one end of the
photoacoustic cell are directly packaged into a whole, and the
microphone is installed on the side wall of the
photoacoustic cell; the photosensitive surface of the photoelectric detection module is aligned to a light emitting port of the photoacoustic
cell, the output end of the photoelectric detection module and the output end of the
microphone are both connected to the input end of the
signal processing module, one output end of the
signal processing module is connected with the light source control module, the other output end of the
signal processing module is connected with the data output module, and the light source control module is connected with the control end of the integrated light source. According to the active air-chamber structure and photoacoustic spectrometry gas
sensing system, the structural design of directly packaging a specially designed DFB
semiconductor laser and one end of an
air chamber into a whole is adopted, the intermediate link of
coupling with optical fibers is omitted, and the injected light power is greatly increased; meanwhile, the
light beam adjustment structure is simplified, and
air chamber miniaturization and stability improvement are achieved.