Electromagnetic water meter transmitter based on intermittent excitation and digital signal processing

Abstract

The invention relates to the field of flow detection, and provides an electromagnetic water meter transmitter based on intermittent excitation and digital signal processing. The transmitter comprisesa single-chip microcomputer minimum system, a power supply management module, an excitation driving module, a signal acquisition module, a man-machine interface module, an external storage module, anoutput module and software; and software is responsible for signal acquisition, signal processing, excitation driving, man-machine interaction and result display; the excitation driving module is usedfor driving a sensor of an electromagnetic water meter to generate a sensor signal; and the signal acquisition module is used for extracting the output signal of the sensor, converting the output signal into a digital quantity and transmitting the digital quantity to a single-chip microcomputer. An excitation mode adopts an intermittent excitation mode, and three-value wave excitation is carriedout once every period; and in algorithmic processing, amplitude demodulation is directly carried out on the acquired sensor output signal, the signal is reconstructed according to a demodulation result, the reconstructed signal is subjected to comb band-pass filtering, amplitude demodulation is carried out again, and instantaneous and accumulated flow is obtained through calculation.

Description

technical field [0001] The invention relates to the field of flow detection, and relates to an electromagnetic water meter, in particular to an electromagnetic water meter transmitter with intermittent excitation and digital signal processing. Background technique [0002] Conductive liquids in industrial production such as industrial water are generally measured by electromagnetic flowmeters, and urban domestic water is often measured by water meters. At present, most of the water meters used in China are traditional mechanical water meters. However, the mechanical water meters rely on the water flow to push the movement of the mechanical parts in the watch to measure the water consumption, which has the disadvantages of large initial flow, low measurement accuracy, easy wear and tear and serious leakage and leakage. . The electromagnetic flowmeter is composed of a transmitter (secondary instrument) and a sensor (primary instrument). Among them, the sensor is used to conve...

AI Technical Summary

Problems solved by technology

Although reducing the excitation current achieves the purpose of reducing power consumption, compared with ordinary electromagnetic flowmeters, the electromagnetic water meter has a small excitation current, which leads to a smaller amplitude of the original signal of the sensor, making the signal very weak when the flow rate is small.

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