Gas concentration detection method based on ultrasonic phase difference technology
A technology of gas concentration detection and phase difference, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze fluids, process detection response signals, instruments, etc., to achieve the effect of improving detection accuracy
Pending Publication Date: 2021-07-30
HARBIN UNIV OF SCI & TECH
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[0003] The purpose of the present invention is to propose a gas concentration detection method based on ultrasonic phase difference technology. By proposing ultrasonic frequency mixing technology, the phase difference of high-frequency signal is converted into phase difference of low-frequency signal for extraction, so as to achieve the realization with a lower operating frequency system. High measurement accuracy requirements to solve the problems existing in the prior art
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[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0029] The basic principle of ultrasonic phase difference gas concentration detection technology is as follows: figure 1 shown. The ultrasonic signal is loaded on the input end of two channels close to the same distance, the reference channel of the two channels is closed air, and the measurement channel is the gas to be measured. When the ultrasonic signal passes through the two channels, the transmission speed of the sound wave is different due to the differe...
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The invention discloses a gas concentration detection method based on an ultrasonic phase difference technology, and belongs to the technical field of gas concentration detection. According to the invention, the conclusion that phase differences before and after mixing are the same is deduced and utilized, two low-frequency signals are obtained by selecting a rectangular wave signal y(t) with the frequency slightly smaller than that of original x1(t) and x2(t) and carrying out frequency mixing on rectangular wave signal y(t) with the original x1(t) and x2(t) respectively, the phase difference of the two low-frequency signals is obtained, so that original detection of the phase difference of two high-frequency ultrasonic signals can be converted into detection of the extremely-low-frequency phase difference; and original phase difference detection of two high-frequency ultrasonic signals can be converted into extremely-low-frequency phase difference detection, so that the requirement of improving the detection precision is met, and the problem that a system must have enough high working frequency when low-concentration gas is measured in a traditional method is solved.
Description
technical field [0001] The invention relates to a gas concentration detection method based on ultrasonic phase difference technology, belonging to the technical field of gas concentration detection. Background technique [0002] The use of acoustic technology for gas concentration detection has the advantages of low cost, low power consumption, and adaptability to complex environments. When the measured gas concentration is very low, the time difference ΔT between the two ultrasonic signals in the dual-channel measurement cavity and the reference cavity is very small, resulting in a corresponding phase difference If the counting frequency of the system is not high, the measured phase difference error will be too large, which will seriously affect the gas concentration measurement accuracy. In the prior art, there is no method that can well solve this problem. Contents of the invention [0003] The purpose of the present invention is to propose a gas concentration detect...
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IPC IPC(8): G01N29/02G01N29/44
CPCG01N29/02G01N29/44G01N2291/012
Inventor 孙慧丁喜波丁欣施云波
Owner HARBIN UNIV OF SCI & TECH