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An ultrasonic time-of-flight measurement method and system suitable for gases and liquids

A time-of-flight and measurement method technology, which is applied in radio wave measurement systems, sound wave re-radiation, measurement devices, etc., can solve problems that cannot meet real-time application requirements, have different proportions, and restrict the measurement accuracy of ultrasonic time-of-flight.

Active Publication Date: 2021-07-06
CHENGDU QIANJIA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cross-correlation method must meet several conditions: store a large number of reference waveform signals; there is only a translation on the time axis between the ultrasonic echo waveform and the reference waveform signal; the amplitude is only different in proportion; the noise form is Gaussian white noise, etc.
These conditions restrict the accuracy of ultrasonic time-of-flight measurement and cannot meet the requirements of real-time applications

Method used

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  • An ultrasonic time-of-flight measurement method and system suitable for gases and liquids
  • An ultrasonic time-of-flight measurement method and system suitable for gases and liquids
  • An ultrasonic time-of-flight measurement method and system suitable for gases and liquids

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Experimental program
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Embodiment 1

[0052] Such as figure 1 As shown, a kind of ultrasonic time-of-flight measuring method applicable to gas and liquid provided in this embodiment comprises the following steps:

[0053] A. Based on the analog-to-digital converter to capture the output waveform and envelope diagram of the received signal after the ultrasonic wave passes through the medium to be tested;

[0054] B. Take the output waveform of the received signal and the maximum value V of the received signal in the envelope diagram max Enter the ruling model to calculate the ruling value V thresh ;

[0055] C. Based on the ruling value V thresh Determine the first local extremum point P of the received signal from the output waveform and envelope diagram of the received signal 1 , the second local extremum point P 2 and the third local extreme point P 3 ;

[0056] D. Put the first local extremum point P 1 , the second local extremum point P 2 and the third local extreme point P 3 The coordinates of are i...

Embodiment 2

[0089] According to the above-mentioned ultrasonic time-of-flight measurement method suitable for gas and liquid, this embodiment provides an ultrasonic time-of-flight measurement system suitable for gas and liquid, including: an acquisition device, a first calculation device, a local extreme point determination device, and a second 2. Computing devices and measuring devices;

[0090] The acquisition device captures the output waveform and envelope diagram of the received signal after the ultrasonic wave passes through the medium to be tested based on the analog-to-digital converter, and sends the output waveform and envelope diagram of the received signal to the first computing device and the local extreme point determination device;

[0091] The first calculating means extracts the output waveform of the received signal and the maximum value V of the received signal in the envelope diagram max And input it into the ruling model to calculate the ruling value V thresh , the f...

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Abstract

An ultrasonic time-of-flight measurement method and system suitable for gases and liquids disclosed in the present invention uses the ADC to sample the received signal, receives the envelope of the signal, and determines the ruling value based on the maximum value of the signal or the intersection point of the envelope , to obtain the rough measurement time of the ultrasonic wave passing through the medium to be tested, and to make further precision on the basis of the rough measurement time of the ultrasonic wave passing through the medium to be tested, to calculate the time of flight of the ultrasonic wave at the position where the waveform changes significantly, and to take the interference into the precise calculation process of the time of flight , can avoid the interference error when the ultrasonic wave flies, the measurement accuracy is high, and the method is simple; after calibrating the calculated estimated flight time t, the absolute flight time T of the ultrasonic wave passing through the medium to be measured can be obtained, which can not only get rid of the need to set the threshold value method The defect of the fixed threshold also considers the sampling interval and capture delay time, which effectively improves the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of ultrasonic time-of-flight calculation, in particular to an ultrasonic time-of-flight measurement method and system suitable for gas and liquid. Background technique [0002] Ultrasonic gas meters have become a research hotspot in the field of gas metering due to their advantages such as non-contact measurement, no moving parts, no pressure loss, and extremely high measurement accuracy. The measurement principle of the ultrasonic gas meter is to estimate the instantaneous flow rate by using the difference in the elapsed time of ultrasonic waves in the downstream and upstream directions. Ultrasonic time-of-flight measurement is the core problem to be solved when ultrasonic is applied to temperature, distance, flow, liquid level, positioning and other applications. At present, ultrasonic time-of-flight measurement methods mainly include the following: [0003] (1) Threshold value method: the receiving circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/00G01S15/08
CPCG01S15/006G01S15/08
Inventor 朱炼刘勋李中华
Owner CHENGDU QIANJIA TECH CO LTD