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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

Inactive Publication Date: 2017-03-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, this fast measurement method is suitable for the case where there is only one main internal relaxation process in the mixed gas, and it is not suitable for the mixed gas with multiple main relaxation processes, which will lead to the loss of some important relaxation information

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

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Embodiment Construction

[0049] In order to explain the technical solution of the present invention more clearly, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The following examples are only used to explain the present invention and do not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0050] A method for measuring the multi-mode relaxation process of mixed gas molecules according to an embodiment of the present invention, the specific process is as follows:

[0051] When a sound wave propagates in a gas, its effective angular wavenumber can be written as sound velocity c(ω) and molecular relaxation absorption coefficient α r (ω) The form of expression:

[0052]

[0053] Where ω=2πf is the angular fr...

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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.

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...

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Application Information

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IPC IPC(8): G01N29/032G01N29/024G01N29/44
CPCG01N29/024G01N29/032G01N29/44G01N2291/011G01N2291/015G01N2291/021
Inventor 朱明张向群刘婷婷王殊汪念李彩云徐梦玲
Owner HUAZHONG UNIV OF SCI & TECH
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