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Signal processing method of automatic zero-point electromagnetic flow meter system thereof

An electromagnetic flowmeter and signal processing technology, applied in the application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effect, and measure flow/mass flow, etc. Correction, performance improvement effect

Active Publication Date: 2012-05-02
SHANGHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

At the same time, when the sensor of the electromagnetic flowmeter has electrode pollution and system grounding changes and other factors, the zero point Z value will change greatly, so that the electromagnetic flowmeter with a fixed zero point Z value will lead to the obtained flow velocity V value with intolerable error

Method used

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  • Signal processing method of automatic zero-point electromagnetic flow meter system thereof
  • Signal processing method of automatic zero-point electromagnetic flow meter system thereof
  • Signal processing method of automatic zero-point electromagnetic flow meter system thereof

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Embodiment 1

[0024] see figure 1 , the electromagnetic flowmeter signal processing method of automatic zero point, the processing system that adopts comprises a sensor 1, an excitation drive unit 2, a signal amplification unit 3, a signal processing unit 4 and a sequence control unit 5; Make described excitation drive unit 2 Output the excitation current I according to the timing S of the timing control unit 5 to generate an excitation magnetic field B in the sensor 1; the measured fluid with a flow velocity V flows through the sensor 1 so that the sensor 1 outputs an induced potential signal E, and the signal amplification unit 3 After the induced potential signal E is amplified, the signal U=X is output, and the value of the signal U=X is collected by the signal processing unit 4 to estimate the value of the fluid velocity V flowing through the sensor 1; it is characterized in that the timing S of the timing control unit 5 In this working period T, the excitation current I=0 of the excit...

Embodiment 2

[0029] see figure 1 , the automatic zero point electromagnetic flowmeter signal processing system, used for the above automatic zero point electromagnetic flowmeter signal processing method, including a sensor 1, an excitation drive unit 2, a signal amplification unit 3, a signal processing unit 4 and a sequence control unit 5. The output of the sensor 1 is output to the signal processing unit 4 after the signal amplifying unit 3, and the signal processing unit 4 is connected to the excitation driving unit 2 through the timing control unit 5, and the excitation driving unit 2 Outputting the excitation current I causes the excitation magnetic field B to be generated in the sensor 1; the timing control unit 5 outputs the timing S so that the excitation drive unit 2 is divided into working periods S 1 and S 2 Use I=I respectively 1 The constant current sum with I=I 2 =- I 1 The constant current works in the forward and reverse constant current excitation mode, so that the fo...

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Abstract

The invention relates to a signal processing method of an automatic zero-point electromagnetic flow meter and a system thereof. Working periods with excitation current I=0 are incessantly inserted during a working process of a magnetic field B generated by the excitation current I of the electromagnetic flow meter. By means of the characteristic that inductive electric potential E equals zero on the condition that I equals zero and B equals zero. Dynamic detection is carried out at this time with an output signal U of a signal amplifying unit as a signal zero-point value Z so as to utilize data deprived of a dynamic zero-point value Z to accurately estimate an actual flow velocity V. Obviously, influence on measurement of the flow velocity V caused by zero-point change is eliminated, and automatic calibration of an zero point is achieved so that an electromagnetic flow meter newly arranged on a technological pipeline can be directly put in operation without firstly adjusting the zero point and the like on the condition that the flow V equals zero, thereby greatly improving utilization performance of the electromagnetic flow meter. Meanwhile, change of symmetrical performance of the inductive electric potential of the sensor can be measured according to change of the signal zero point value Z so as to diagnose change of electrode pollution, insulation performance and the like of the sensor.

Description

technical field [0001] The invention relates to a signal processing method and system for an automatic zero point electromagnetic flowmeter. technical background [0002] Electromagnetic flowmeter is a flow measuring instrument based on Faraday's law of electromagnetic induction. The sensor of the electromagnetic flowmeter measures the magnetic field B in the pipeline P. When the fluid in the measurement pipeline P has a flow rate V, there is a theoretical induced potential e=K×B×V on the two measuring electrodes of the sensor, where K is a coefficient. In fact, the electromagnetic flowmeter and its sensor, signal amplification unit and signal processing unit, like any electronic signal processing system, have the problem of zero point of the signal. As described on page P48 of "New Flow Measuring Instrument" published by Chemical Industry Press in 2006, the signal obtained on the actual sensor is E=K×B×V+E0, where E0 is the zero point of the sensor. Due to the zero point ...

Claims

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Application Information

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IPC IPC(8): G01F1/58G01F1/60
Inventor 李斌赵连福高颂李航宇阮键俊
Owner SHANGHAI UNIV
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