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High-precision flow measurement method based on pulse type flow sensor

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

Active Publication Date: 2021-04-30
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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  • High-precision flow measurement method based on pulse type flow sensor
  • High-precision flow measurement method based on pulse type 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 type flow sensor, and belongs to the technical field of flow measurement by utilizing the pulse type flow sensor. According to the technical scheme, accurate pulse counting is achieved through the phase difference of periodic stable monotonous changes between a detected pulse signal f1 output by a pulse type flow sensor and a synthesized reference pulse signal f2, and the flow measurement precision is improved. In the period time, a synchronous integer relationship exists between the detected pulse signal f1 and the synthesized reference pulse signal f2, and the number of pulses is calculated to be m and n respectively. The detection time t formed by the reference pulse signal f2 is n / f2, and the flow value is obtained according to the detection time t and the pulse number m of the detected pulse signal f1. By utilizing the characteristic of phase difference change between the pulse signals f1 and f2, the measurement resolution is improved, the counting error of + / -1 pulse is overcome, and the flow measurement precision is further improved.

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 Applications(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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