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System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology

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

Inactive Publication Date: 2014-12-24
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
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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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  • System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology
  • System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology
  • System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology

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specific Embodiment approach 1

[0034] Specific embodiments 1. 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] Data processing module comprises preamplifier 9, the first lock-in amplifier 10, the second lock-in amplifier 13, data acquisition card 1 and computer 14;

[0036] The laser source module includes a function generator 2, a laser controller 3, a laser 4, an optical fiber collimator 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 end with the current control signal input end o...

specific Embodiment approach 2

[0057] Embodiment 2. The difference of the CO gas detection system based on quartz tuning fork enhanced photoacoustic spectroscopy according to Embodiment 1 is that the optical fiber collimation package 5 and the focusing lens 6 are located on the same optical path.

specific Embodiment approach 3

[0058] Embodiment 3. According to Embodiment 2, the difference of the CO gas detection system based on quartz tuning fork enhanced photoacoustic spectroscopy technology is that the reference gas chamber 7 is a cuboid structure;

[0059] Its left side wall and right side wall are respectively provided with laser incident window 71 and laser exit window 72, and the upper end of laser incident window 71 and the upper end of laser exit window 72 are both inclined to the air chamber, and are all in line with the vertical direction. The angles formed are all 5°~7°; the incident window 71 and the exit window 72 are on the optical path described in claim 2;

[0060] An air inlet 73 and an air outlet 74 are respectively opened on the upper surface and the lower surface of the reference air chamber 7 .

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Abstract

The invention provides a system and a method for detecting CO gas based on a quartz tuning fork enhanced photoacoustic spectrometry technology, relates to a system and a method for detecting the CO gas and aims at solving the problem of low detection accuracy of the existing CO gas photoacoustic spectrometry detection technology. A data processing module transmits a current control signal to a laser device controller via a function generator, and meanwhile, transmits a temperature control parameter to the laser device controller; the laser device controller drives a laser device to emit near infrared laser which is incident into a gas chamber after being collimated and focused; the gas absorbs optical energy so that the optical energy is converted into heat energy and further converted into an acoustic pressure signal; a quartz tuning fork mounted in the gas chamber converts an acoustic signal into an electric signal; the electric signal of the quartz tuning fork is converted and amplified and then input into the measurement channel input end of a phase-locked amplifier; the phase-locked amplifier inverts the concentration of the CO gas to be detected by performing secondary harmonic detection in combination with the reference signal of the function generator. The system and the method for detecting the CO gas based on the quartz tuning fork enhanced photoacoustic spectrometry technology are applicable to 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 easily cause explosions and fires, but also pollute the environment and even lead to malignant poisoning incidents. CO gas can effectively reflect the overheating and aging process of solid insulating materials in operating power transformers. Through the detection of CO gas, it can predict the internal latent faults and development of oil-paper insulated transformers, and realize early diagnosis. In the early stage of a fire, CO gas can be used as a characteristic gas to judge whether there is combustible material burning, and then realize 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. The commonly...

Claims

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Application Information

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IPC IPC(8): G01N21/17
Inventor 张佳薇李明宝宋文龙熊峰
Owner NORTHEAST FORESTRY UNIVERSITY
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