Method and device for detecting gas concentration on basis of ultrasonic principles

A gas concentration detection and measurement device technology, applied in measurement devices, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc., can solve the problems of lack of gas concentration measurement methods and devices, and achieve simple design, variety, calculation simple effect

Active Publication Date: 2018-04-13
CHINA JILIANG UNIV
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  • Abstract
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  • Application Information

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Nowadays, the main research direction is focused on the latter, and most researchers are currently focusing on the me...

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  • Method and device for detecting gas concentration on basis of ultrasonic principles
  • Method and device for detecting gas concentration on basis of ultrasonic principles
  • Method and device for detecting gas concentration on basis of ultrasonic principles

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Embodiment Construction

[0017] The gas concentration detection method and device based on the ultrasonic principle proposed by the present invention will be further described below in conjunction with the measurement principle and the accompanying drawings.

[0018] relaxation absorption α r and classical absorption α c two kinds. According to the existing research, the relationship between the two kinds of absorption is numerical addition, that is, α=α r +α c .

[0019] The simple harmonic sound pressure follows the formula P=P 0 e αz , it can be proved by experiments that the voltage value of the transducer at the receiving end is proportional to the sound pressure, that is, P=kV. By measuring the peak value V of the echo when the transducer at the same frequency point is at two different distances z, that is The sound absorption coefficient of the current frequency point can be obtained

[0020]

[0021] According to the calculation formula of classical sound absorption, the classical so...

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Abstract

The invention discloses a device and a method for detecting gas concentration on the basis of ultrasonic principles. The device comprises a device body, a single chip microcomputer unit, a temperaturemeasuring circuit, a pressure measuring circuit, a motor control circuit, a driving circuit, a switch circuit, a signal amplification circuit, a time measuring circuit, a peak value detection circuitand ultrasonic transducers. The device and the method for detecting the gas concentration on the basis of the ultrasonic principles have the advantages that echo signals of two frequency points can be measured by two pairs of mounted ultrasonic transducers by the aid of certain designs, peak values of the echo signals further can be obtained by the aid of certain circuit designs, sound absorptioncoefficients of gas and sound velocities can be obtained by means of certain calculation, the maximum sound absorption values and relaxation frequencies can be obtained by means of further calculation, mathematical models built in early experiments are applied, the current gas concentration can be obtained by the aid of internal table lookup and interpolation processes for single chip microcomputers, accordingly, measuring processes are simple and convenient, and the device and the method are practical.

Description

technical field [0001] The invention belongs to the field of gas component detection, and relates to a gas concentration detection method and device based on an ultrasonic principle. Background technique [0002] Various gases are inevitably involved in human daily life and industrial production. In order to qualitatively understand and quantitatively grasp various properties of the measured gas, gas sensing technology came into being. And to complete this series of tasks is the gas sensor. The gas sensor can convert information such as gas composition and content into electrical signals, and based on these electrical signals, through a series of post-processing, restore the information of the measured gas, and then realize the functions of gas detection, monitoring and alarming . [0003] At present, the main gas component detection technologies include: chemical reaction, semiconductor, gas chromatographic absorption, infrared spectral absorption, heat conduction, conta...

Claims

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Application Information

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IPC IPC(8): G01N29/032
CPCG01N29/032G01N2291/0215
Inventor 赵伟国许韵恺徐晓丹
Owner CHINA JILIANG UNIV
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