基于GP-IB总线的加速度计测试系统设计

摘要

Through analyzing the situation of accelerometer testing system,there are several bottleneck factors such as various testing procedure,complicated operation,and easy to cause mishandling which have restricted the accelerometer＇s automatic testing capability.To calibrate the performance parameters better,the testing system for accelerometer based on GPIB is designed,and the composition of the system is introduced.According to the characters of high accuracy and faint feedback signals of accelerometer,the digital multimeter technique is applied to realize the accurate test of the accelerometer＇s faint output signals through its favorable signal processing and noise limiting capacity.At the same time,for the small sample of test data,double modified interpolation is used to process the obtained data,enlarge the sample size and solve the problem that it＇s difficult to build times-series model with a small sample.Comparing with operational testing system,advanced technology,comprehensive function and powerful data processing analyzing capacity are main advantages of this testing system.The application indicates that this precise and steady testing system can meet the requirement of accelerometer calibrating testing completely.%通过对当前加速度计测试工序多、操作复杂、易引起误操作的现状分析,为能更好地标定石英挠性加速度计性能参数,设计了基于GPIB总线技术的加速度计测试系统,确定了系统的硬件组成。同时针对石英挠性加速度计反馈信号较弱、精度要求高的特点,设计采用了数字多用表技术,利用其内部抑制噪声和信号处理等技术,实现了加速度计输出微小信号的精确测量。同时,由于加速度计测试样本数据较少,采用两次插值对获得的数据进行处理,扩大了样本容量,解决了小样本难以建模的问题。与现用的测试系统相比较,该测试系统有着技术先进、数据处理与分析能力强等优点,测试结果表明,该测试系统精确稳定,能够满足加速度计标定测试的使用要求。