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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  • Abstract
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  • Claims
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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

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

Examples

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Example Embodiment

[0023] Example one

[0024] See figure 1 , The automatic zero point electromagnetic flowmeter signal processing method, the processing system adopted includes a sensor 1, an excitation drive unit 2, a signal amplification unit 3, a signal processing unit 4 and a timing control unit 5; make the excitation drive unit 2 According to the time sequence S of the time sequence control unit 5, the excitation current I is output to generate the excitation magnetic field B in the sensor 1; the measured fluid with the flow velocity V flows through the sensor 1 to make the sensor 1 output the induced potential signal E, and the signal amplifying unit 3 The induced electric potential signal E is amplified and the output signal U=X is output. The signal processing unit 4 collects the signal U=X value to estimate the fluid flow velocity V value flowing through the sensor 1; it is characterized by the timing S of the timing control unit 5 In this working period T, the excitation current I of t...

Example Embodiment

[0028] Example two

[0029] See figure 1 , The automatic zero point electromagnetic flowmeter signal processing system, used in 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 timing sequence Control unit 5. The output of the sensor 1 is output to the signal processing unit 4 through 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 The excitation current I is output to generate an excitation magnetic field B 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 Respectively use I=I 1 Constant current and use I = I 2 =- I 1 The constant current of the sensor 1 is used for forward and reverse constant current excitati...

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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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