手持式微机械陀螺扫频测试仪的实现

传统微机械陀螺的扫频测试一般采用价格昂贵的通用测试仪,其存在测试成本高、效率低等缺点。设计了一种基于现场可编程门阵列(FPGA)的手持扫频测试仪,能够自动进行扫频测试并求取被测微机械陀螺的谐振频率与品质因数,通过手动调节直流偏置电压大小的方式进行直流扫频测试,在自身的显示屏上绘制相关特性曲线。采用直接数字合成技术产生交流驱动信号,利用最小二乘拟合算法快速定位谐振频率点的大致位置,可以缩短测试时间、提高测试效率。应用测试表明,手持式微机械陀螺扫频测试仪能够快速、准确地完成微机械陀螺扫频测试,测试结果与传统测试方式吻合很好。

Implementation of the Handheld Frequency Sweeping Test Instrument for the Micromechanical Gyroscope

The traditional frequency sweeping test for the micro-mechanical gyroscope is based on some costly testing instruments,and has some defects,such as the high cost and low efficiency.A portable frequency sweeping test instrument was designed based on the field programmable gate array(FPGA).The test instrument can carry out the frequency sweeping test automatically and test the resonant frequency and quality factor,complete the direct current sweeping test by means of artificially changing the value of the direct current and draw characteristic curves in the display screen.The direct digital synthesize(DDS) technology was applied to generate the AC driving signal in the open-loop driving circuit.The least squares algorithm was applied to estimate the range of the resonant frequency so as to shorten the test time and improve the test efficiency.The result of the applying test shows that the portable test instrument can finish the frequency sweeping test fast and accurately,and the test data are in good accord with the traditional way.