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Transient electromagnetic flow transmitter based on differential interference compensation

A technology of interference compensation and electromagnetic flow, applied in the field of measurement system, can solve the problems of complex solution process and unfavorable real-time implementation, and achieve the effect of reducing excitation power consumption, good measurement accuracy and real-time performance, and reducing excitation time

Active Publication Date: 2018-09-28
HEFEI UNIV OF TECH +1
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Problems solved by technology

However, the solution process of this method is relatively complicated, which is not conducive to real-time implementation

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  • Transient electromagnetic flow transmitter based on differential interference compensation
  • Transient electromagnetic flow transmitter based on differential interference compensation
  • Transient electromagnetic flow transmitter based on differential interference compensation

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Embodiment Construction

[0015] The design idea of ​​the present invention is: Aiming at the problem that the signal voltage is affected by both flow and time in the transient process, by analyzing the signal model of the transient process, studying the dynamically changing excitation current and signal voltage in the transient state, and proposing the method of differential interference compensation The processing method is to determine that the result of dividing the voltage by the excitation current after differential interference compensation has a linear relationship with the flow rate, and use the collected voltage and current data to verify. Then, take the DSP chip of TMS320F28335 model as the core, develop the hardware system based on DSP. Write DSP software to implement the proposed measurement method in real time. Among them, in order to accurately measure the signal voltage and excitation current in the dynamic process, two 24-bit ADCs are used to collect the voltage and current signals res...

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Abstract

The invention relates to the field of flow detection, in particular to a transient electromagnetic flow transmitter based on differential interference compensation. A differential interference compensation processing method is proposed for a transient measurement process of an electromagnetic flowmeter, the transient electromagnetic flow transmitter based on differential interference compensationis developed, and the measurement method is implemented in real time. A transient measurement system comprises an excitation driving module, a signal conditioning and acquiring module, a man-machine interface module, a memory module, an output module, a communication module and a software processing module. The excitation driving module excites a field coil to produce an induced magnetic field; the signal conditioning and acquiring module synchronously samples signal voltage and field current through two ADCs and sends a sampling result to a DSP; in the DSP, the processing method based on differential interference compensation is implemented in real time, and instantaneous flow and accumulated flow are obtained by calculation. According to the system, measurement is performed through a transient excitation process of the electromagnetic flowmeter, excitation power consumption is reduced, and the provided transient measurement method has good timeliness and accuracy.

Description

technical field [0001] The invention relates to the field of flow detection, and is a transient electromagnetic flow transmitter based on differential interference compensation, in particular, a measurement system that utilizes the transient process of excitation current for measurement and uses a differential interference compensation method for real-time processing. Background technique [0002] Electromagnetic flowmeter is an instrument that measures the volume flow of conductive liquid based on the law of electromagnetic induction, and is widely used in the flow measurement of various conductive liquids. At present, most electromagnetic flowmeters use low-frequency rectangular wave or ternary wave excitation, and the steady-state excitation current is one hundred to several hundred milliamperes, and it is necessary to maintain a stable period of sufficient time so that the output signal of the sensor can obtain a stable period for a long time. Guarantee its measurement a...

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Application Information

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IPC IPC(8): G01F1/58
Inventor 徐科军王刚吴建平邹明伟许伟石磊汪春畅康一波于新龙
Owner HEFEI UNIV OF TECH
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