Novel photoacoustic spectrum gas sensor

Abstract

The invention discloses a novel photoacoustic spectrum gas sensor, which comprises a main control board, wherein a plurality of connecting supports are symmetrically installed on the main control board, a light source driving board is installed at the upper ends of the connecting supports together, an electrically-modulatable light source is installed in the middle of the lower surface of the light source driving board, the electrically-modulatable light source is located on the central axis of the connecting supports, and the main control board and the light source driving board are connected through flat cables fixed to the connecting supports. According to the novel photoacoustic spectrum gas sensor, the size of the device is reduced by adopting the electrically-modulatable light source, a gas chamber cover in which the high-concentration gas to be detected is sealed replaces an optical filter, the cost is saved, the detection accuracy is increased, the diversity and selectivity of the device are realized through the matching of the gas chamber cover, the photoelectric detector and the sound pickup, the use cost is reduced, and the large-area popularization is facilitated.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a novel photoacoustic spectrum gas sensor. Background technique [0002] When a beam of modulated light irradiates the gas in the transparent container, the gas will undergo local thermal expansion after absorbing the light energy, produce periodic thermal expansion, and emit sound waves, which are received by the acoustic sensor, which is the photoacoustic effect of the gas , Different wavelengths of incident light will cause different gases in the container to be heated and expanded to form a photoacoustic spectrum. Using the principle of photoacoustic spectroscopy, the gas can be distinguished and the gas concentration can be detected. [0003] Photoacoustic gas sensors usually use a laser light source, which is derived from the high monochromaticity of the laser and can be modulated to generate sound waves that can be easily detected. Limited by the manufacturing process of the las...

AI Technical Summary

Problems solved by technology

[0003] Photoacoustic gas sensors usually use a laser light source, which is derived from the high monochromaticity of the laser and can be modulated to generate sound waves that can be easily detected. Limited by the manufacturing process of the laser, the photoacoustic gas sensor using the laser light source The wavelength of the sensor is limited, and the gas detected is limited, and the use of non-laser light sources is cheap, but usually requires a narrow-band filter with a gas-specific absorption band, which is expensive

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