Dynamic strain measuring method by using vibrating wire-type strain gauge

一种使用振弦式应变计的动态应变测量方法

Abstract

本发明涉及一种使用振弦式应变计的动态应变测量方法,属于电学领域,应用于结构安全健康监测行业。微控制器通过微控制器I/O(控制脉冲产生器,通过激振线圈激励钢弦,钢弦起振后在感应线圈内产生感应电动势并通过信号放大器和抗混叠滤波器调理后通过模数转换器转换成数字信号,并通过时SPI接口传输给DMA控制器,最终把数据存放在队列缓冲器,微控制器内核对不断刷新数据的队列缓冲器内的数据进行FFT运算得到动态的应变数据。本发明解决了目前使用应变电阻测量动态应变的零点漂移、已损坏、寿命短等问题。
The invention relates to a dynamic strain measuring method by using a vibrating wire-type strain gauge, which belongs to the field of electricity and is applied to a structural safety and health monitoring industry. A microcontroller controls a pulse generator through a microcontroller I/O, a string wire is excited through an exciting coil, an induction electromotive force is generated in an induction coil after vibration starting of the string wire, the induction electromotive force is conditioned through a signal amplifier and an anti-aliasing filter and is converted to digital signals, the digital signals are transmitted to a DMA controller through an SPI interface, data are finally saved in a queue buffer, and a microcontroller core carries out FFT operation on data in the queue buffer with data refreshed continuously to obtain dynamic strain data. Problems of zero shift, already damages, short service life and the like when a strain resistor is used currently for measuring the dynamic strain can be solved.

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