Differential absorption spectrum gas detection device based on optical fiber amplifier
A technology of differential absorption spectroscopy and optical fiber amplifier, which is applied in the field of differential absorption spectroscopy gas detection, can solve the problems of reducing the sensitivity of the detection system and hindering the combined use, so as to improve the ability to detect trace gases, enhance stability, and absorb light. Effect
Active Publication Date: 2019-07-23
江苏安控易创信息科技有限公司
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Problems solved by technology
However, the long optical path gas absorption cell is an effective module to enhance the detection sensitivity of trace gases in the system, but the above-mentioned characteristics of the broadband infrared light source hinder its combined use with the long optical path gas cell, which greatly reduces the sensitivity of the detection system
At present, there is still a lack of high-sensitivity trace gas detection devices based on the combination of broadband infrared light sources and long-path gas absorption cells
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[0047] For hydrogen sulfide (H 2 S) and carbon monoxide (CO) two-component gas detection as an example. The selective absorption characteristic wavelength for hydrogen sulfide gas is 1578nm, the selective absorption characteristic wavelength for carbon monoxide gas is 1566.6nm, and the selected reference wavelength is 1550nm. Correspondingly, three holes are opened on the wavelength modulation disc, and collimating mirrors and optical filter groups with center wavelengths of 1578nm, 1566.6nm and 1550nm are respectively installed. In this embodiment, the system device is connected to two sets of optical power amplification modules, and each amplification module has three optical fiber channels and optical fiber amplifiers of the wavelength division multiplexer, corresponding to wavelengths of 1578nm, 1566.6nm and 1550nm respectively. Correspondingly, 4 holes are opened on the right reflector of the absorption pool, and the fiber coupling mirror and fiber collimating mirror in ...
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The invention discloses a differential absorption spectrum gas detection device based on an optical fiber amplifier. The differential absorption spectrum gas detection device comprises a broadband infrared light source, a stepping motor, a wavelength modulation disk, a long-range gas absorption pool, an optical power amplification module, a photoelectric detection module and a controller. The wavelength modulation disk performs wavelength selection on broadband infrared light emitted by the broadband infrared light source, so that narrow-band detection light beams centered on different wavelengths sequentially enter the long-range gas absorption pool, the light beams are incident into the gas absorption pool again after subjected to the power amplification of the optical power amplification module composed of an optical fiber coupling mirror, a wavelength division multiplexer, an optical fiber amplifier and an optical fiber collimating mirror, and the light beams are reflected and deflected in the absorption pool for multiple times until the light beams emit from a gas chamber and arrive at the photoelectric detection module. According to the differential absorption spectrum gas detection device disclosed by the invention, the low power consumption broadband infrared light source is effectively combined with the long-range gas absorption pool to make full use the advantages ofwide band, simple structure and low price of the broadband infrared light source and to achieve a multi-component gas detection device with low cost and high sensitivity.
Description
technical field [0001] The invention belongs to the field of differential absorption spectrum gas detection, and relates to a differential absorption spectrum gas detection device based on an optical fiber amplifier, which is mainly used in the fields of industrial dangerous gas monitoring and early warning, atmospheric environment monitoring and the like. Background technique [0002] Infrared absorption spectroscopy technology has been widely used in gas detection. Compared with the use of lasers as active detection light sources, broadband infrared light sources (such as xenon lamps, heating resistors, etc.) have the advantages of wide radiation band, simple structure and low price. However, the broadband infrared light source will generate a lot of heat while radiating infrared detection light. If a high-power broadband infrared light source is used, on the one hand, the heating energy consumption of the detection system will be greatly increased, and on the other hand, a...
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Login to View More IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/01G01N21/3504
Inventor 王寅徐鹏李彬姚鸿熙
Owner 江苏安控易创信息科技有限公司