DSP-based electromagnetic flowmeter signal processing system

Abstract

The invention discloses a DSP-based electromagnetic flowmeter signal processing system, which comprises a hardware system and a software system. The hardware system consists of an excitation driving module, a signal modulation and acquisition module, a signal processing control module, a man-machine interface module, a communication module and a power supply management module. The signal control module uses DSP as a core. In the system, a high frequency square wave excitation control scheme is adopted, and the DSP generates an excitation time sequence to control the excitation driving module to perform high frequency square wave excitation of a magnet exciting coil; the signal modulation and acquisition module amplifies and filters an output signal of an electromagnetic flowmeter, performs the analog-to-digital conversion of the output signal and outputs the output signal to the DSP; the software system processes an acquired signal to obtain a flowmeter measurement result and send the result to a liquid crystal display; and the parameters of the flowmeter are set by keyboard operation or by the interaction between a master computer and the flowmeter by the communication module. The system can realize the high-accuracy and high-speed measurement of fluid flow, particularly the measurement of flow of liquid-solid two-phase fluid such as pulp.

Description

technical field [0001] The invention relates to the field of flow detection, and is an electromagnetic flowmeter signal processing system, especially a primary instrument for a contact electromagnetic flowmeter, with a digital signal processor (DSP) as the core, high-frequency square wave excitation, comb-based The signal processing method of band-pass filtering, statistical analysis and signal reconstruction realizes the signal processing system of electromagnetic flowmeter for high-precision and high-speed measurement of single-phase fluid medium and slurry fluid. Background technique [0002] Electromagnetic flowmeter is an instrument that measures the volume flow of conductive liquid according to Faraday's law of electromagnetic induction. The magnetic field is applied to the measured fluid by the excitation coil, and the accurate flow measurement is realized by detecting the induced electromotive force of the moving fluid in the magnetic field and performing signal proc...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve some problems existing in the existing electromagnetic flowmeter technology. Aiming at the contact electromagnetic flowmeter, it provides a digital signal processor (DSP)-based technology that can be used for high-precision, high-speed measurement and complex fluids such as slurry. Signal Processing System of Electromagnetic Flowmeter for Measurement

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