Method for measuring multi-mode relaxation process of mixed gas molecule

A mixed gas, multi-mode technology, applied in the direction of measuring devices, processing detection response signals, analyzing materials, etc., can solve the problems of relaxation information loss, etc., and achieve the effect of saving cumbersome operations and strong adaptability
CN106501357AInactive Publication Date: 2017-03-15HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2017-03-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for measuring a multi-mode relaxation process of a mixed gas molecule. The method comprises the following steps: establishing an acoustic spectrum expression of a single relaxation; when omega tau=1, acquiring a general expression form of the single relaxation process of the acoustic spectrum, thereby acquiring an expression form of valid heat capacity of the multi-mode relaxation process; measuring a sound absorption coefficient alpha r(omega) and a sound velocity c(omega) of 2*N frequency points, thereby acquiring 2*N non-dimensional sound relaxation absorption coefficient mu m(omega); and solving N epsilon i and tau i values from 2*N equations, substituting N epsilon i and tau i values into an original equation, thereby acquiring a spectral line of the mu m(omega) about omega=2 pi f, namely, reconstructing the multi-mode relaxation process. The method for measuring the multi-mode relaxation process of the mixed gas molecule, disclosed by the invention, not only is simple in operation but also is capable of accurately reconstructing a complete spectral line of the multi-mode relaxation process. An acoustic spectrum measuring method with higher adaptability and practicability is supplied for an accurate measuring technique for a gas sensor based on acoustic spectrum decomposition.
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Description

technical field

[0001] The invention belongs to the technical field of gas sensors, and relates to a method for measuring the multi-mode relaxation process of mixed gas molecules.

[0002] technical background

[0003] At present, the sensing technologies that can detect gas components mainly include: chemical reaction, semiconductor, gas chromatography, infrared spectrum absorption, heat conduction and other technologies, but these technologies have their own advantages and disadvantages. The gas sensor technology based on the measurement of the multi-mode relaxation process of mixed gas molecules based on acoustic spectrum, the principle is to use the characteristics of the sound absorption and sound velocity dispersion lines of different frequencies to change with the change of gas composition, so that the gas molecular structure information can be directly obtained Its outstanding advantages, which can detect different types and concentrations of mixed gases, are currentl...

Claims

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