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Co gas detection system and method based on quartz tuning fork enhanced photoacoustic spectroscopy technology

A gas detection system, quartz tuning fork technology, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of low detection accuracy, avoid wavelength drift, improve detection sensitivity, and enhance resistance to environmental low-frequency noise interference effect of ability

Inactive Publication Date: 2017-11-03
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to solve the problem of low detection accuracy of existing CO gas photoacoustic spectroscopy detection technology, thereby providing a CO gas detection system and method based on quartz tuning fork enhanced photoacoustic spectroscopy technology

Method used

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  • Co gas detection system and method based on quartz tuning fork enhanced photoacoustic spectroscopy technology
  • Co gas detection system and method based on quartz tuning fork enhanced photoacoustic spectroscopy technology
  • Co gas detection system and method based on quartz tuning fork enhanced photoacoustic spectroscopy technology

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specific Embodiment approach 1

[0034] DETAILED DESCRIPTION One, a CO gas detection system based on quartz tuning fork enhanced photoacoustic spectroscopy technology, including a data processing module, a laser source module, and a photoacoustic signal detection module,

[0035] The data processing module includes a preamplifier 9, a first lock-in amplifier 10, a second lock-in amplifier 13, a data acquisition card 1 and a computer 14;

[0036] The laser source module includes a function generator 2, a laser controller 3, a laser 4, a fiber collimation package 5 and a focusing lens 6;

[0037] The photoacoustic signal detection module includes a gas chamber 7, a quartz tuning fork 8, a reference gas chamber 11 and a photodetector 12; the quartz tuning fork 8 is located in the gas chamber 7, and the gas chamber 7 is filled with CO gas; the reference gas chamber 11 Filled with CO gas;

[0038] The data acquisition card 1 connects the current control signal output terminal with the current control signal input terminal...

specific Embodiment approach 2

[0057] Specific embodiment two, according to specific embodiment one, the difference of the CO gas detection system based on quartz tuning fork enhanced photoacoustic spectroscopy technology is that the fiber collimator package 5 and the focusing lens 6 are located on the same optical path.

specific Embodiment approach 3

[0058] Specific embodiment three, according to specific embodiment two, the difference of the CO gas detection system based on the quartz tuning fork enhanced photoacoustic spectroscopy technology is that the reference gas chamber 7 is a rectangular parallelepiped structure;

[0059] The left side wall and the right side wall are respectively provided with a laser entrance window 71 and a laser exit window 72. The upper end of the laser entrance window 71 and the upper end of the laser exit window 72 are both inclined to the gas chamber and are aligned with the vertical direction. The angles are all 5°~7°; the incident window 71 and the exit window 72 are on the optical path according to claim 2;

[0060] The upper surface and the lower surface of the reference air chamber 7 are respectively provided with an air inlet 73 and an air outlet 74.

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Abstract

A CO gas detection system and method based on quartz tuning fork enhanced photoacoustic spectroscopy technology relates to a CO gas detection system and method. It is to solve the problem of low detection accuracy of the existing CO gas photoacoustic spectroscopy detection technology. The data processing module sends the current control signal to the laser controller through the function generator, and at the same time sends the temperature control parameters to the laser controller, and the laser controller drives the laser to emit near-infrared laser, which is incident into the gas chamber after being collimated and focused; the gas Absorb light energy and convert it into heat energy, and then convert it into sound pressure signal. The quartz tuning fork installed in the gas chamber converts the sound signal into an electrical signal; the electrical signal of the quartz tuning fork is converted and amplified, and then input to the input port of the measurement channel of the lock-in amplifier. , the lock-in amplifier combines the reference signal of the function generator to detect the second harmonic, and then inverts the CO gas concentration to be measured. The invention is suitable for CO gas detection.

Description

Technical field [0001] The invention relates to a CO gas detection system and method. Background technique [0002] CO gas in underground coal mines is both flammable, explosive and toxic. If leakage or accumulation is not detected in time, it will not only cause explosions and fires, but also pollute the environment and even lead to vicious poisoning. CO gas can effectively reflect the overheating and aging process of solid insulating materials in operating power transformers. Through the detection of CO gas, the internal latent faults and development of oil-paper insulated transformers can be predicted, and early diagnosis can be realized. In the early stage of a fire, CO gas can be used as a characteristic gas to determine whether combustibles are burning, thereby realizing fire warning and monitoring. [0003] CO gas detection is widely used in modern production and life, especially in many occasions where trace CO gas needs to be detected. Commonly used CO detection methods c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
Inventor 张佳薇李明宝宋文龙熊峰
Owner NORTHEAST FORESTRY UNIVERSITY