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A high-precision flow measurement method based on pulse flow sensor

A flow sensor and flow measurement technology, applied in the direction of liquid/fluid solid measurement, measuring device, volume measurement, etc., can solve the problems of counting error and low accuracy of pulse flow measurement, and achieve simple instrument structure, eliminate counting error, and easy Achieved effect

Active Publication Date: 2022-03-22
TANGSHAN COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention has high measurement precision, simple circuit structure and easy implementation, and solves the problems in the background technology that the measurement precision of pulse flow is not high due to ±1 pulse count error and the detection time is not synchronized with the detected pulse signal.

Method used

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  • A high-precision flow measurement method based on pulse flow sensor
  • A high-precision flow measurement method based on pulse flow sensor

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Embodiment Construction

[0031] Below by embodiment the present invention will be further described

[0032] Such as figure 2 Shown:

[0033] In this flow measurement system, the DDS is controlled by the computer control center to synthesize the reference pulse signal f 2 , the detected pulse signal is output by the pulse flow sensor f 1 . reference pulse signal f 2 and the detected pulse signal f 1 The phase difference signal is generated by the staggered phase detector controlled by CPLD, and the computer control center detects the change of the phase difference, and controls the DDS to synthesize the reference pulse signal according to the change of the phase difference f 2 frequency value. When the computer control center controls the DDS to synthesize the reference pulse signal f 2 and the detected pulse signal f 1 When there is the same nominal value and there is only a small frequency difference, the phase difference between the two pulse signals shows a periodic monotonous chan...

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Abstract

The invention relates to a high-precision flow measurement method based on a pulse flow sensor, and belongs to the technical field of flow measurement using a pulse flow sensor. Technical solution: use the detected pulse signal output by the pulse type flow sensor f 1 and the synthesized reference pulse signal f 2 Periodically stable and monotonously changing phase difference to achieve accurate pulse counting and improve flow measurement accuracy. During the cycle time, the detected pulse signal f 1 and the synthesized reference pulse signal f 2 There is a synchronous integer relationship between them, and the counted pulse numbers are m and n . by the reference pulse signal f 2 composition detection time t for n / f 2 , according to the detection time t and the detected pulse signal f 1 the number of pulses m , get the flow value. The present invention utilizes the pulse signal f 1 and f 2 The characteristics of phase difference change between phases improve the measurement resolution, overcome the counting error of ±1 pulse, and then improve the flow measurement accuracy.

Description

technical field [0001] The invention relates to a high-precision flow measurement method based on a pulse-type flow sensor, which utilizes the phase difference relationship between a reference pulse signal and a pulse signal to be detected to conduct phase difference phase discrimination between signals and pulse sampling to achieve high The invention relates to precision flow measurement, which belongs to the technical field of flow measurement by using a pulse type flow sensor. Background technique [0002] A pulse flowmeter is a flowmeter in which the signal generated by the fluid flowing through the flowmeter sensor is a pulse frequency signal. Meter factor of pulse type flowmeter K It is the number of signal pulses sent by the flowmeter for the unit volume of fluid flowing through the flowmeter. Its calculation formula is: [0003] (1) [0004] In the above formula K is the meter factor of the flowmeter, N It is the number of pulses sent by the flowmeter. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F15/075
CPCG01F15/0755
Inventor 贾兆旻马壮柳延领向波
Owner TANGSHAN COLLEGE
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