The Study Of Based On The Relevant Measurement Of Electromagnetic Flow Meter Signal Conditioning Circuit Design

Electromagnetic flow meter, which is based on Faraday's Induction Low, is a rate flow meter. Electromagnetic flow meter is a main measure instrument for measuring liquid flux, which is growing rapidly growth in domestic and foreign markets. The development and application's history of electromagnetic flow meter is anti-jamming technology history, especially about dealing with the measure signal of the weenie flux. Because the measure signal is very puny, and the noise is big, if it can not remove the noise effectively, the measure signal will be inundated in the noise, resulting in the error of the measure signal, but the mostly methods about dealing with the measure signal are advantages and disadvantages. The paper puts the Mixed-related based on the measurement of electromagnetic flow meter signal conditioning method, in theory to solve the differential interference in the elimination of noise at the same time take into account the impact of lower other types of noise impact on the target. It is not only the micro-flow of electromagnetic flow meter with the development of theoretical significance, but is also a promising electromagnetic flow meter signal conditioning technology method.The history and status of electromagnetic flow meter are summarized, at the same time its theory and developed production are introduced in detail; and the paper analyses the main interference factors of the electromagnetic flow meter and the exciting ways, and make the decision to choose the low frequency rectangle wave finally. The principle and the characteristic of analog-digital multiplication are described in detail. And the paper analyses the error of the analog transform to digital and the theory of removing differential interference. On the base of the theory, the paper brings forward the method of digital-analog-mixed related classic filter, and this method can not only eliminate the impact of the differential interference, but also can reduce the other interferences. It designs the hardware circuit on this condition, and expounds the elements of the hardware circuit in detail. At last, the paper sets up the emulator model, by the way of emulating in theory, it testifies that the signal conditioning circuit of the method of digital-analog-mixed related classic filter is superior to the traditional signal conditioning circuit. Its precision is higher.