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Laser infrared spectrum trace substance detection device and method based on fiber grating

A fiber grating and infrared spectroscopy technology, which is applied in the field of laser infrared spectroscopy trace substance detection devices, can solve problems such as difficulties in long-distance detection, and achieve the effects of improving detection sensitivity, reducing costs, and improving thermal-mechanical conversion efficiency

Active Publication Date: 2019-06-21
NEIJIANG NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the above deficiencies in the prior art, the present invention provides a fiber grating-based laser infrared spectrum trace substance detection device and method to solve the problem of difficult long-distance detection

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  • Laser infrared spectrum trace substance detection device and method based on fiber grating
  • Laser infrared spectrum trace substance detection device and method based on fiber grating
  • Laser infrared spectrum trace substance detection device and method based on fiber grating

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Embodiment Construction

[0037] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0038] Such as figure 1As shown, a fiber grating-based laser infrared spectrum trace substance detection device includes an excitation laser 1, a reflector 2, a concave mirror 3, a fiber grating sensor 4, a continuous broadband laser 5, an optical fiber, a coupler 6, and a tunable optical fiber Fapo filter 7, photodetector 8, data processing system 9 and driving circuit 10, the optical fiber includes first optical fiber 11,...

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Abstract

The invention discloses a laser infrared spectrum trace substance detection device and method based on a fiber grating. The detection device is characterized in that the type and the concentration ofa to-be-detected substance are acquired through by measuring variation of Bragg wavelength, extremely high anti-noise ability and high resolution and measurement precision are achieved, and the detection device is very suitable for long-distance detection in the high temperature, high humidity and flammable and explosive environments; the fiber grating has strong multiplexing capability, differentmonitoring points are arranged, multi-point network monitoring and different-object monitoring can be realized, and system cost is effectively reduced; the tunable fiber Fabry filter interference demodulation method is utilized to measure Bragg wavelength variation of the fiber grating, and the system is made to have extremely high resolution and extremely high multiplexing capability.

Description

technical field [0001] The invention relates to the technical field of laser infrared absorption spectrum detection of trace substances, in particular to a fiber grating-based laser infrared spectrum trace substance detection device and method. Background technique [0002] Trace substance detection technology is not only of great significance to the fields of air pollution monitoring, industrial production process monitoring and explosive detection, but also can be widely used in food safety monitoring, fire early warning and environmental monitoring and other fields. Laser infrared absorption spectroscopy technology can detect various substances in gaseous, solid and liquid forms. It has high detection accuracy, high sensitivity, high spectral resolution, and does not depend on the quantity and quality of the measured substance. It has become the most important and It is one of the most important development directions and research hotspots of trace substance detection tec...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 林成陈洪英黄永超霍峰许立志
Owner NEIJIANG NORMAL UNIV
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