Active air-chamber structure and photoacoustic spectrometry gas sensing system

Abstract

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.

Description

technical field [0001] The invention relates to a sensing unit structure in the field of gas detection and light sensing, in particular to an integrated light source type active gas chamber structure and a photoacoustic spectrum gas sensing system. Background technique [0002] In recent years, with the maturity and growth of the optical communication industry, the cost of a large number of high-performance optical devices has been continuously reduced, especially the semiconductor DFB lasers in the near-infrared communication band (800-1700nm), whose output power and linewidth characteristics have been greatly improved. promote. It makes it possible to realize the high precision and online monitoring urgently needed by modern industrial applications. Photoacoustic spectroscopy is a detection technology without background signal, which has the advantages of not consuming gas samples, high sensitivity, short detection time, and convenient on-site detection. For very low con...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an integrated light source type active gas chamber structure and photoacoustic spectrum gas transmission for the problems of complex light source coupling and beam adjustment process and

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