用声表面波滤波器为悬臂梁式SAW加速度计增添加速度方向判断功能

Adding Direction-Judging Function to the SAW Accelerometer with SAWF

加速度是矢量,所以在测量加速度大小的同时,给出加速度的方向是非常必要的。但传统SAW加速度计设计忽视了对被测加速度方向的判断问题。声表面波滤波器(SAWF)是一种性能优良的新型电子器件,本文基于SAW滤波器的带通滤波性质,设计了一种新的SAW加速度计系统,它不仅实现了判断加速度方向的客观需求,而且为加速度计基本量程的扩大创造了条件。

The measure-accuracy of surface acoustic wave （SAW） accelerometer is very high, but it can＇t judge the direction of acceleration, because the frequency meter can only measure plus frequency. This feature limits SAW accelerometer＇s application scope. In order to add the function of acceleration direction judgment for traditional SAW accelerometer, a new system of SAW accelerometer is put forward. The elementary principle is to make use of the band pass characteristic of surface acoustic wave filter （SAWF） choose SAW signal matched the direction of acceleration. This plan is also a base for enlarging measure range of SAW accelerometer.