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Signal amplification treatment method of electromagnetic flow meter

An electromagnetic flowmeter and signal amplification technology, which is used in the application of electromagnetic flowmeters to detect fluid flow, volume/mass flow generated by electromagnetic effects, measurement flow/mass flow, etc., to improve measurement accuracy, enhance analysis and processing capabilities, and eliminate zero points. The effect of drift interference

Inactive Publication Date: 2007-12-26
SHANGHAI UNIV
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Problems solved by technology

However, it uses feedback amplification processing on the signal during the positive modulation or negative modulation time period. For the electromagnetic flowmeter signal amplification processing, it does not use the zero excitation process of the electromagnetic flowmeter to eliminate the zero drift. It is not conducive to providing more time to amplify, acquire and process the signal during the positive and negative rectangular excitation time

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  • Signal amplification treatment method of electromagnetic flow meter
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Embodiment Construction

[0013] A preferred embodiment of the present invention is as follows: see FIG. 1 , FIG. 2 and FIG. 3 .

[0014] An electromagnetic flowmeter signal amplification processing method, the sensor 1, the excitation controller 2 and the impedance converter 3 make the magnetic field B of the sensor 1 = 0 during the T0-T3 period according to the T0-T10 beat timing T generated by the timing controller 7, Make the magnetic field B of the sensor 1 positive or negative during the T3-T6 period, make the magnetic field B of the sensor 1=0 during the T6-T7 period, make the magnetic field B of the sensor 1 negative or positive during the T7-T10 period, and the sensor 1 outputs a signal S0 to the impedance converter 3, the impedance converter 3 outputs the signal S1, which is characterized in that the feedback structure composed of the difference amplifier 4 and the baseline adjuster 6 performs the amplification process on the signal S1 under the baseline adjustment according to the time sequen...

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Abstract

The present invention relates to an electromagnetic flowmeter signal amplification processing method. Said method adopts the following steps: under a zero-excitation process of sensor it makes baseline feedback regulation, and then in the following positive and negative rectangular wave excitation time quantum makes the signal undego the processes of undistored effective amplification, acquisition and processing so as to implement accurate measurement.

Description

technical field [0001] The invention relates to a signal amplification and processing method of an electromagnetic flowmeter. technical background [0002] Modern electromagnetic flow uses positive and negative rectangular wave modulation to excite the sensor to generate a corresponding flow induction potential, so that the flow signal output by the sensor can eliminate the polarization phenomenon and provide a steady-state flow signal. In practice, the flow signal output by the sensor still has interference problems such as low signal-to-noise ratio and large zero point drift. Patent ZL99113868.6 provides an effective method for dynamically eliminating zero-point drift interference and accurately amplifying signals for signal processing under positive and negative rectangular wave modulation. However, it uses feedback amplification processing on the signal during the positive modulation or negative modulation time period. For the electromagnetic flowmeter signal amplificat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/60G01F1/58
Inventor 李斌曹金亮史骥
Owner SHANGHAI UNIV
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