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VOC gas detection system and method

A gas detection system and gas detection technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of long detection period, difficult on-site detection, high detectable concentration limit, and achieve low detection concentration limit, The effect of fast response, high efficiency and continuous detection

Inactive Publication Date: 2021-02-12
BEIHANG UNIV
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Problems solved by technology

At present, the detection methods of VOC mainly include gas chromatography and chemical conversion method, etc., but these methods have disadvantages such as difficulty in on-site detection, long detection cycle, and high lower limit of detectable concentration.

Method used

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  • VOC gas detection system and method

Examples

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Embodiment 1

[0068] (1) Make the optical fiber into a tapered optical fiber

[0069] Fabrication of tapered optical fiber: One end of a section of optical fiber is welded and coupled with the output jumper of the laser, and the other end is cut flat with a cutter and placed in a power probe (that is, a probe connected to a power meter). Use stripping pliers to remove the coating layer in a small area, place the area where the coating layer is removed above the head of the hydrogen-oxygen flame gun, fix the two ends of the area where the coating layer is removed on the clamp of the tapering machine, and use a stepping motor to The optical fiber is stretched at a constant speed to both sides. During the stretching process, the numerical changes displayed by the power meter are recorded. The ratio of the difference between the initial power value displayed before stretching and the power value after the tapering is over and the initial power value is the tapering. The loss of the fiber, that ...

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Abstract

The invention discloses a VOC gas detection system and method. The detection system comprises a light source, a gas detection device, a signal receiving device and a data processing device, wherein the gas detection device includes a closed container and an optical fiber, and a gas inlet and a gas outlet are formed in the closed container; the optical fiber is provided with an evanescent wave optical fiber structure so that light entering the optical fiber can be transmitted out in an evanescent field mode, an area, provided with the evanescent wave optical fiber structure, of the optical fiber is fixed in the closed container and loaded with a metal oxide semiconductor material, the two ends of the optical fiber extend out of the closed container, and one end of the optical fiber is connected with the light source; the signal receiving device is connected with one end, far away from the light source, of the optical fiber and is set to be capable of receiving an output power signal from the optical fiber; and the data processing device is connected with the signal receiving device. The VOC gas detection system and the VOC gas detection method provided by the invention can realize on-site, rapid, efficient and continuous detection of VOC, and the lower limit of a detectable concentration is low.

Description

technical field [0001] This application relates to but not limited to the field of VOC detection, especially a VOC gas detection system and detection method. Background technique [0002] VOC (volatile organic compounds) are volatile organic compounds with low boiling points such as formaldehyde, xylene, and acetone. Long-term exposure and inhalation of these volatile organic compounds by the human body will have adverse effects on health. Therefore, the realization of VOC in the working and living environment Efficient and rapid detection is particularly important. At present, the detection methods of VOC mainly include gas chromatography and chemical conversion method, but these methods have disadvantages such as difficulty in on-site detection, long detection cycle, and high lower limit of detectable concentration. Therefore, there is an urgent need for an on-site, fast, efficient and continuous detection method for VOCs. Contents of the invention [0003] The applica...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/01
CPCG01N21/17
Inventor 张梦王征
Owner BEIHANG UNIV
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