Photoacoustic spectrometry gas detection device based on pulse infrared light source

Abstract

The invention discloses a photoacoustic spectrometry gas detection device based on a pulse infrared light source. The infrared light source is used as an emitting light source, pulse modulation is conducted on the light source, and concentration detection can be conducted on gas easy to absorb within the whole emission spectrum range of the infrared light source. The concentration of specific gas is detected through a filter wheel and light filters, wherein the six light filters can be installed on the filter wheel, the filter wheel is controlled by a serial port to rotate so that different light filters can be selected, and six types of gas can be detected at the same time at most. The photoacoustic effect generated after to-be-detected gas in an inner cavity of a photoacoustic pool absorbs an optical signal with the specific wavelength is converted into an electric signal through a microphone, a band-pass filter amplification circuit is input, analysis and calculation are conducted through a data collection and control module, and concentration of various types of gas is obtained. By means of the device, six types of gas including CO, CO2, CH4, C2H2, C2H4 and C2H6 can be quantitatively detected, and the device is suitable for on-site detection of gas in transformer oil.

Description

technical field [0001] The invention belongs to the field of spectral detection, and more specifically relates to a pulsed infrared light source for CO, CO in transformer oil 2 、CH 4 、C 2 h 2 、C 2 h 4 、C 2 h 6 A photoacoustic spectroscopy gas detection device for detecting the concentration of various gases. Background technique [0002] The transformer is an important equipment in the power system, and whether its operation is reliable directly determines the reliability of the power supply system. Dissolved gas analysis in oil is one of the most effective methods for diagnosing latent faults in transformers. By detecting the concentration of gas in the transformer oil, the operating status of the transformer can be monitored in real time, the nature, type, and severity of the faults existing in the transformer can be diagnosed, and the development trend of the fault can be predicted to realize the condition-based maintenance of the transformer. [0003] For large ...

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Problems solved by technology

[0005] In view of the defects of large post-maintenance workload and high maintenance cost in gas detection in transformer oil in the prior art, the purpose of the present invention is to solve the above technical problems

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