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A Transient Electromagnetic Flow Transmitter Based on Voltage and Current Differentiation

A technology of voltage, current and electromagnetic flow, which is applied in the field of measurement systems, can solve problems such as unfavorable real-time implementation and complex solution process, achieve good measurement accuracy and real-time performance, reduce excitation power consumption, and reduce excitation time.

Active Publication Date: 2020-01-10
CHONGQING CHUANYI AUTOMATION +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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  • A Transient Electromagnetic Flow Transmitter Based on Voltage and Current Differentiation
  • A Transient Electromagnetic Flow Transmitter Based on Voltage and Current Differentiation
  • A Transient Electromagnetic Flow Transmitter Based on Voltage and Current Differentiation

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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 flow and time simultaneously 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 a voltage-current differential ratio The processing method eliminates the influence of time, confirms that there is a linear relationship between the differential ratio and the flow rate, and uses the collected voltage and current data for offline verification. 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 transient measurement method in real time. Among them, in order to accurately obtain the signal voltage and excitation current in the dynamic process, two 24-bit ADCs are used to collect the voltage and current signals respectively in the hardware...

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Abstract

The invention relates to the field of flow detection, in particular to a transient electromagnetic flow transmitter based on voltage and current differentiation. Aiming at a transient measurement process of an electromagnetic flowmeter, a transient measurement method based on the voltage and current differentiation is proposed, and the transient electromagnetic flow transmitter based on the voltage and current differentiation is researched to implement the measurement method in real time. A transient measurement system includes an excitation driving module, a signal conditioning acquisition module, a human-machine interface module, a storage module, an output module, a communication module and a software processing module. The excitation driving module drives an excitation coil to generatean induced magnetic field; the signal conditioning acquisition module uses two ADCs for synchronously sampling signal voltage and excitation current and transmits sampling results to a DSP; in the DSP, a processing method based on a voltage and current differential ratio is achieved in real time, and instantaneous flow and cumulative flow are obtained through calculation.

Description

technical field [0001] The invention relates to the field of flow detection, and is a transient electromagnetic flow transmitter based on voltage and current differentiation, in particular a measurement system that uses the transient process of excitation current to measure and uses the voltage and current differential ratio 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 accuracy. F...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/58
CPCG01F1/58
Inventor 王刚徐科军邹明伟吴建平石磊许伟康一波汪春畅于新龙
Owner CHONGQING CHUANYI AUTOMATION
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