Intelligent electromagnetic micrometer

Abstract

The invention discloses an intelligent electromagnetic micrometer. The intelligent electromagnetic micrometer comprises a housing, a display, a circuit board and a sensor, wherein the circuit board and the sensor are arranged inside housing. The housing is a shielding housing; the circuit board is provided with a circuit processing circuit, an exciting driving circuit, a demodulating control circuit, a microprocessor and an A / D (analog / digital) converter, wherein the signal processing circuit is connected with the A / D converter and the sensor, the A / D converter is connected with the microprocessor, and the signal processing circuit comprises a signal amplifying circuit, a filtering circuit and a feedback circuit. By filtering the output of the signal amplifying circuit through the filtering circuit, the influence of interference noise can be reduced, the signal to noise ratio can be improved, and further the performance index of the electromagnetic micrometer can be improved, and flow measurement lower limit can be effectively expanded. Therefore, the intelligent electromagnetic micrometer is high in reliability, stability, corrosion resistance and measurement precision.

Description

technical field [0001] The invention relates to an intelligent electromagnetic flowmeter with micro-flow. Background technique [0002] With the continuous improvement of the level of industrial automation, in the process of industrial production, it is necessary to accurately measure and control the flow and velocity of fluids in various pipelines. , the importance of flow measurement, especially micro-flow measurement, is becoming increasingly prominent; in the electromagnetic flowmeters currently used, the peak sample-and-hold signal processing circuit is generally used to amplify the flow signal, and its broadband signal amplifier makes a variety of interference noises When the flow signal is amplified together, the noise spectrum will inevitably be shifted or aliased into the frequency band of the flow signal, resulting in low signal-to-noise ratio, poor resolution, and difficulty in expanding the lower limit of flow measurement. The existing peak sample-and-hold signa...

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Problems solved by technology

[0002] With the continuous improvement of the level of industrial automation, in the process of industrial production, it is necessary to accurately measure and control the flow and velocity of fluids in various pipelines. , the importance of flow measurement, especially micro-flow measurement, is becoming increasingly prominent; in the electromagnetic flowmeters currently used, the peak sample-and-hold signal processing circuit is generally used to amplify the flow signal, and its broadband signal amplifier makes a variety of interference noises When the flow signal is amplified together, the noise spectrum will inevitably be shifted or aliased into the frequency band of the flow signal, resulting in low signal-to-noise ratio, poor resolution, and difficulty in expanding the lower limit of flow measurement

The existing peak sample and hold signal processing circuit restricts the improvement of the performance index of the micro-flow electromagnetic flowmeter

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