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Method, device and equipment for detecting phase shift in flow measurement

A phase shift detection and flow measurement technology, applied in the field of signal measurement, can solve the problems of the periodic change of the echo signal, the large workload of calibration, and the aging of the transducer, so as to improve the accuracy, reduce the workload, and improve the work efficiency. The effect of efficiency

Active Publication Date: 2022-07-12
北京声链科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inconsistency of the transducers, the cycle thresholds of the echo signals are also different, so the measurement circuits need to be calibrated one by one, and the calibration workload is large
And when the airflow fluctuates greatly or the transducer ages after long-term use, the change rule of the echo signal cycle will also change, and the preset cycle threshold may lead to false detection

Method used

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  • Method, device and equipment for detecting phase shift in flow measurement
  • Method, device and equipment for detecting phase shift in flow measurement
  • Method, device and equipment for detecting phase shift in flow measurement

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Embodiment 1

[0032] figure 1 This is a flow chart of a method for detecting phase shift in flow measurement provided in Embodiment 1 of the present invention. This embodiment is applicable to the situation where phase shift occurs. The method can be executed by a device for detecting phase shift in flow measurement. Specifically, the method includes: Follow the steps below:

[0033] Step S110, obtaining an initialization value.

[0034] In this embodiment, the initialization value is determined in advance according to the pulse measurement signal, and the pulse measurement signal is the first detection signal sent by the transducer before flow measurement, wherein the initialization value includes the initial voltage threshold, the initial starting point position, and the sequence number of the initial measurement point. and the initial period threshold.

[0035] In this embodiment, the initialization value can be understood as a predetermined threshold value in the flow detection proces...

Embodiment 2

[0048] figure 2 This is a flowchart of a method for detecting phase shift in flow measurement according to Embodiment 2 of the present invention. The technical solution of this embodiment is further refined on the basis of the above-mentioned technical solution, and specifically mainly includes the following steps:

[0049] Step S201 , in a zero flow state or a stable flow state, at least one pulse measurement signal with a set number of cycles is acquired.

[0050] In this embodiment, the zero flow state can be understood as a state in which the liquid or gas does not flow. For example, when measuring a water pipe, the valve is closed so that the water in the water pipe does not flow; the stable flow state can be understood as the liquid or gas flow does not change abruptly, For example, a valve is suddenly opened or closed, so that the liquid in the pipeline flows suddenly. Setting the number of cycles can be understood as pre-selecting how many cycles of the pulse measur...

Embodiment 3

[0110] Figure 7 It is a structural diagram of a phase shift detection device in flow measurement according to Embodiment 3 of the present invention, the device includes: an acquisition module 31 , a receiving module 32 , a period value determination module 33 and a phase shift determination module 34 .

[0111] The acquisition module 31 is used to acquire an initialization value, the initialization value is determined in advance according to the pulse measurement signal, and the pulse measurement signal is the first detection signal sent by the transducer before the flow measurement, wherein the initialization value includes an initial voltage threshold, an initial starting point position, initial measurement point serial number, and initial period threshold; receiving module 32, for receiving a second detection signal with an amplitude greater than the initial voltage threshold sent by the transducer during flow measurement, and the second detection signal includes an echo si...

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Abstract

The embodiment of the present invention discloses a method, device and equipment for detecting phase shift in flow measurement. The method includes: obtaining an initialization value, the initialization value is determined in advance according to a pulse measurement signal, and the pulse measurement signal is sent by a transducer before flow measurement. The first detection signal, wherein the initialization value includes the initial voltage threshold, the initial starting point position, the sequence number of the initial measurement point and the initial period threshold; the second detection signal with the amplitude greater than the initial voltage threshold sent by the transducer when receiving the flow measurement, the second The detection signal includes an echo signal; the first measurement period value and the second measurement period value corresponding to the echo signal are determined according to the initial starting point position and the sequence number of the initial measurement point; according to the first measurement period value, the second measurement period value and the initial period threshold value A phase shift detection result of the second detection signal is determined. Solve the problem of huge workload caused by a large number of tests, reduce workload, and improve the accuracy of test results.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of signal measurement, and in particular, to a method, device, and device for detecting phase shift in flow measurement. Background technique [0002] The most critical part of ultrasonic flow measurement is to accurately measure the propagation time of ultrasonic waves between the transmitting and receiving transducers. Threshold detection is the most commonly used detection method for time difference ultrasonic flow measurement. By setting the threshold voltage, the arrival time of the signal is determined to calculate the propagation time. Because of the inertial hysteresis characteristic of piezoelectric conversion, the electrical signal converted by the transducer after receiving the ultrasonic signal always contains a certain hysteresis time and the signal amplitude gradually increases. In order to avoid interference, the threshold voltage is usually set at a relatively high value...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/667
CPCG01F1/667G01F1/66G01F1/662
Inventor 王志峰陈红军
Owner 北京声链科技有限公司
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