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Improved measurement method of time difference type ultrasonic flow meter

A measurement method, ultrasonic technology, applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring devices, etc., can solve problems such as low measurement accuracy, easy fluctuation of ultrasonic signal amplitude, and uneven fluid flow rate. To achieve the effect of improving the measurement accuracy

Active Publication Date: 2016-06-22
SHANGHAI ELECTRICAL AUTOMATION R&D INST
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Problems solved by technology

[0003] The purpose of the present invention is to provide a time-difference ultrasonic flowmeter for the existing time-difference ultrasonic flowmeter to provide a time-difference ultrasonic flowmeter for the technical defects that the fluid flow rate is not uniform and the amplitude of the ultrasonic signal is prone to fluctuations resulting in low measurement accuracy. The improved measurement method minimizes the influence of external factors on the measurement parameters and improves the measurement accuracy of the transit-time ultrasonic flowmeter

Method used

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  • Improved measurement method of time difference type ultrasonic flow meter
  • Improved measurement method of time difference type ultrasonic flow meter
  • Improved measurement method of time difference type ultrasonic flow meter

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Embodiment

[0026] as attached image 3 As shown, the improved measurement method of the transit-time ultrasonic flowmeter using the "N-type reflective structure" transducer and the time-to-digital conversion module includes the following steps:

[0027] (1) Find the first zero-crossing point

[0028] Under the pipe body and ultrasonic probe used in the ultrasonic flowmeter required by the regulations, according to the selected time-to-digital conversion module to transmit ultrasonic frequency and transducer receiving performance, determine the first ultrasonic zero-crossing point received by the transducer Time, in this example, the time-to-digital conversion module TDC-GP21 from ACAM Company of Germany is used. The amplitude of the received signal reaches its maximum around 72us. Therefore, in the program, the first zero-crossing time is limited between 70.5us and 72.5us, and the starting point is not allowed to fluctuate too much.

[0029] (2) Set the second and third starting points...

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Abstract

The invention provides an improved measurement method of a time difference type ultrasonic flow meter. The influences of external interference multiple ultrasonic signals can be effectively reduced by improving an existing time difference method and on the basis of ultrasonic receiving end over-zero point analysis and time difference correction, and an effective method for accurately obtaining forward and reserve time differences is provided. By correcting flow calculation, in actual measurement of the flow meter, the average flow speed of fluid is infinitely close to the true value, and the metering precision of the time difference type ultrasonic flow meter is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and in particular relates to an improved measurement method of a transit-time ultrasonic flowmeter, which can improve the measurement accuracy of the transit-time ultrasonic flowmeter. Background technique [0002] Most of the ultrasonic flowmeters currently on the market use the time-of-flight method to measure flow. This method is to use a pair of ultrasonic transducers to send and receive ultrasonic waves, measure the flow velocity of the fluid by measuring the time difference between the forward and reverse flow of ultrasonic waves in the fluid, and then calculate the flow rate through the flow velocity. This method has the advantages of simple operation, high measurement accuracy, and strong adaptability to pipe diameters. But as attached figure 1 As shown, when using the time-of-flight method for flow measurement, it is necessary for ultrasonic waves to propagate back and forth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
CPCG01F1/66G01F1/668
Inventor 周游游张冰缪俊
Owner SHANGHAI ELECTRICAL AUTOMATION R&D INST
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