Magnetostriction high-precision time measurement system based on electro-magnetic induction

Abstract

The invention provides a magnetostriction high-precision time measurement system based on electro-magnetic induction and relates to the fields of electromagnetism, electronic technique, sensor technology and digital signal processing. According to the magnetostriction high-precision time measurement system based on electro-magnetic induction, firstly a time measurement sequence chart is designed according to an operating principle of a magnetostrictive displacement sensor, and then the magnetostriction high-precision time measurement system is built based on electro-magnetic induction on complex programmable logic device (CPLD). The magnetostriction high-precision time measurement system comprises a time interval acquisition module, an inductive pulse signal processing module, a counting module and a counted data processing module. The time interval acquisition module comprises a drive pulse generating circuit, a time-delay circuit and a remote sensing (RS) trigger circuit, and the counting module comprises a 16-digit counter and an inner crystal oscillator. The magnetostriction high-precision time measurement system based on electro-magnetic induction has the advantages that the functions are achieved by adopting the CPLD, high measurement precision can be achieved when the CPLD with a higher speed is adopted, and design flexibility of the circuits is improved. The accuracy of the magnetostrictive displacement sensor is improved due to the fact that the structure of the circuits is simplified, the cost is lowered, and equipment can be downsized easily.

Description

technical field [0001] The invention relates to the fields of electromagnetism, electronic technology, sensor technology, and digital signal processing, and in particular relates to the knowledge of magnetostrictive displacement sensor, electromagnetic induction, and high-precision time measurement technology based on electronic technology. Background technique [0002] The magnetostrictive displacement sensor uses the magnetostrictive torsional wave as the propagation medium to induce the magnetostrictive sensor. The sensor has the characteristics of non-contact measurement, high precision, good repeatability, stability and reliability, and strong environmental adaptability, and has been widely used in petroleum, chemical, pharmaceutical and other industries. [0003] Such as figure 1 As shown, the magnetostrictive displacement sensor generates a rotating magnetic field around the waveguide wire by applying a given excitation pulse to the waveguide wire. The position magn...

AI Technical Summary

Problems solved by technology

However, most of the time measurement circuits of existing magnetostrictive displacement sensors use analog technology, and traditional analog methods are difficult to implement on integrated circuits. With the continuous development of semiconductor technology, embedded technology and EDA technology, digital design technology will gradually replace analog technology

The digital method uses synchronous clock pulses to count and measure the time interval. To improve the time measurement accuracy of the digital method, it is necessary to increase the frequency of the counting clock. However, the traditional TTL and CMOS logic circuits cannot work at a high frequency, so that The accuracy of the magnetostrictive displacement sensor is not high

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