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Ultrasonic flight time measuring method and system suitable for gas and liquid

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, different scales, and restrict the measurement accuracy of ultrasonic time-of-flight. Simple, improve measurement accuracy, and avoid interference errors

Active Publication Date: 2021-04-23
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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  • Ultrasonic flight time measuring method and system suitable for gas and liquid
  • Ultrasonic flight time measuring method and system suitable for gas and liquid
  • Ultrasonic flight time measuring method and system suitable for gas and liquid

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Experimental program
Comparison scheme
Effect test

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 of the received signal in the envelope diagram Enter the judgment value calculated in the judgment model ;

[0055] C. Based on adjudicated value Determine the first local extremum point of the received signal from the output waveform and envelope diagram of the received signal , the second local extreme point and the third local extreme point ;

[0056] D. Put the first local extremum point , the second local extreme point and the third local extreme point The coordinates are input into the Lagrangian interpolation...

Embodiment 2

[0085] 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;

[0086] 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;

[0087] The first calculating means extracts the output waveform of the received signal and the maximum value of the received signal in the envelope diagram and input it into the ruling model to calculate the ruling value , the first calculat...

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Abstract

The present invention discloses an ultrasonic flight time measuring method and system suitable for the gas and the liquid, the ADC is used for sampling the received signal to receive the envelope of the signal, the cutting value is determined according to the maximum value of the signal or the intersection point of the envelope, and the rough measuring time when the ultrasonic wave passes through the medium to be measured is obtained; and the method is further accurate on the basis of rough measurement time of ultrasonic waves passing through a to-be-measured medium, the ultrasonic flight time is calculated according to the position with obvious waveform change, interference is considered in the accurate calculation process of the flight time, interference errors during ultrasonic flight can be avoided, the measurement accuracy is high, and the method is simple. The calculated estimated flight time t is calibrated to obtain the absolute flight time T of the ultrasonic wave passing through the to-be-measured medium, so that the defect that a threshold method needs to set a fixed threshold can be overcome, the sampling interval and the capture delay time are also considered, and the measurement precision is effectively improved.

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 method: The receiving circuit use...

Claims

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Application Information

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