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A system and method for multi-point multi-gas photoacoustic spectroscopy detection based on all-optical network

A detection system, photoacoustic spectroscopy technology, applied in the direction of color/spectral characteristic measurement, measurement device, material analysis through optical means, etc., can solve the problem that the photoacoustic gas detection system can only detect a single point, and achieve easy networking , reduce complexity and improve stability

Active Publication Date: 2020-12-08
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a multi-point multi-gas photoacoustic spectroscopy detection system and method based on an all-optical network, aiming to solve the problem that the existing photoacoustic gas detection system can only detect a single point

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  • A system and method for multi-point multi-gas photoacoustic spectroscopy detection based on all-optical network

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] One aspect of the present invention provides a multi-point multi-gas photoacoustic spectroscopy detection system based on an all-optical network, such as figure 1 shown, including:

[0036] A light source generating module 1, configured to generate a wide-spectrum light source;

[0037] The wave division multiplexing module 2 is connected with the light source generating module, and is used to divide the wide-spectrum light source into N channels of narrow-band light;

[0038] N optical splitting modules 4, the input ends are respectively connected to N output ends of the wave division mul...

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Abstract

The invention discloses a multi-point multi-gas photoacoustic spectrum detection system and method based on an all-optical network. The system comprises a light source generating module, a wave decomposition multiplexing module, N optical splitting modules, N photoacoustic pools, N optical microphones, a wave division multiplexing module, an optical signal receiving module and a plurality of optical fibers connected among the modules, wherein all the modules are connected in turn. The photoacoustic pools are used for generating the photoacoustic effect. A broad-spectrum light source comprisinga plurality of absorption peaks of the gas to be measured is demultiplexed so that a plurality of narrow-band light with different frequencies can be obtained. The narrow-band light is divided into two paths which are used as an excitation light source to generate photoacoustic signals. The photoacoustic signals are received and processed after wavelength division multiplexing, and the gas concentration information of the corresponding detection point can be obtained by analyzing the optical signals at different center frequencies and thus the multi-point multi-component detection of the gascan be realized.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and more specifically relates to a multi-point multi-gas photoacoustic spectrum detection system and method based on an all-optical network. Background technique [0002] Photoacoustic spectroscopy is a spectroscopic technique based on the photoacoustic effect. In the photoacoustic effect, gas molecules absorb infrared light of a specific wavelength and are excited to a high-energy state. The molecules in the high-energy state convert the absorbed light to After the energy is converted into heat energy, it returns to a low-energy state. When the frequency of the incident light is modulated, the heat energy will show the same periodic change as the modulation frequency to generate sound waves. The sound signal is detected by the microphone and the final concentration of the gas is calculated. . [0003] In practical applications such as gas detection in pipe corridors, it is necessary to mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/01G01N21/31
Inventor 司马朝坦汪超林高远袁康蔡一诺鲁平刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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