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Gas concentration measuring device and method based on off-resonance photoacoustic spectrometry principle

A technology of gas concentration measurement and photoacoustic spectroscopy, applied in the field of optical detection, can solve the problems of complex design of photoacoustic cells, and achieve the effects of low manufacturing cost, small size and high measurement accuracy

Pending Publication Date: 2020-03-27
INNER MONGOLIA POWER GRP
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Problems solved by technology

This kind of scheme has the problem of complex design of photoacoustic pool

Method used

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  • Gas concentration measuring device and method based on off-resonance photoacoustic spectrometry principle
  • Gas concentration measuring device and method based on off-resonance photoacoustic spectrometry principle
  • Gas concentration measuring device and method based on off-resonance photoacoustic spectrometry principle

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Embodiment Construction

[0016] The following is a description of the implementation of "a gas concentration measurement device and method based on the principle of non-resonant photoacoustic spectroscopy" disclosed in the present invention through specific specific examples. Those skilled in the art can understand the present invention from the content disclosed in this specification Advantages and effects of the invention. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed c...

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Abstract

The invention relates to a gas concentration measuring device based on an off-resonance photoacoustic spectrometry principle. The gas concentration measuring device comprises: a photoacoustic cell; afirst microphone and a second microphone which are respectively arranged at different positions of the photoacoustic cell and respectively output a first electric signal and a second electric signal;a phase detector that detects a phase difference between the first electric signal and the second electric signal; and a signal output device which is used for outputting a measurement signal according to the phase difference, wherein the measurement signal is used for determining the concentration of a preset component of the gas in the photoacoustic cell.

Description

technical field [0001] The application belongs to the field of optical detection, and in particular relates to a gas concentration measuring device and method based on the principle of non-resonant photoacoustic spectroscopy. Background technique [0002] Photoacoustic spectroscopy can quantitatively detect the concentration of various gases, and has the advantages of no need for regular calibration, high sensitivity, large dynamic range, and the detector is not easily polluted. Non-resonant photoacoustic spectroscopy technology uses thermal radiation light source, which can detect multiple gases at the same time, and more components can be expanded only by changing the filter. The cost is relatively low, and it is widely used in the online detection of transformer insulating oil. The non-resonant photoacoustic spectroscopy instrument uses a microphone (microphone) as a sound receiver to detect the sound signal of the gas in the photoacoustic cell. The inventors of the pres...

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Application Information

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IPC IPC(8): G01N21/17G01N21/31G01N21/01
CPCG01N21/01G01N21/1702G01N21/31G01N2021/0112G01N2021/1704
Inventor 孙利强张叔禹吴集光贾新民刘永江葛利宏张文战
Owner INNER MONGOLIA POWER GRP
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