压电式六维加速度传感器测量系统研究

Research on Measurement System of Six-axis Piezoelectric Accelerometer

针对9-SPS并联压电式六维加速度传感器的结构特点与工作原理,设计一种集多通道电荷放大器、信号采集与处理为一体的测量系统。其中电荷放大器部分根据传感器的特点对传统电荷放大器进行了改进与优化,不仅实现了电荷放大器的小型化,且其测量范围、滤波器参数及增益均可通过程序控制,实现自动测量;信号采集与处理单元采用现场可编程门阵列(FPGA)和数字信号处理器(DSP)联合架构,兼顾了速度与灵活性,为系统实现实时处理提供了保障。与传统测量系统相比,该系统具有测量精度高,体积小,成本低,使用方便及具有良好的人机交互等特点。

According to the structure characteristics and working principles of 9-SPS parallel six-axis piezoelec- tric accelerometer, a measurement system consisting of multi-channel charge amplifier, signal acquisition and pro- cessing units has been designed. By optimizing the conventional charge amplifier, the designed charge amplifier not only has smaller size, but also its measurement range, filter parameters and the gain can be controlled by program, thus the measurement can be carried out automatically. Taking account of speed and flexibility, the signal acquisi- tion and processing unit is designed on a structure based on FPGA and DSP, so as to make sure the ability of real- time process. Compared with traditional measuring system, this system has the features of high precision, small volume, low cost, easy to use and good human-machine interaction and so on.