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传统的微机械陀螺采用扫频方法测试结构的品质因数,存在耗时长、测量效率低和精度差等问题。提出了一种新的品质因数测量方法,该方法的原理是通过对陀螺的驱动端施加一个激励脉冲,采集驱动检测端的相应衰减信号,并通过处理得到衰减信号的频率和斜率,从而检测陀螺的品质因数。采用自行设计的激励电路,外购NI公司的高速采集卡和基于LabVIEW的处理程序测试了陀螺的品质因数。采用该方法可以使一只微机械陀螺的品质因数测试时间从原来的3~5min减少到20s左右,极大地提高了测试效率和测试精度。通过对不同品质因数的陀螺样品的测量,充分验证了此种方法的效果和正确性。
Traditional micromechanical gyroscopes use the frequency sweep method to test the quality factor of the structure, which has the problems of long time consuming, low measurement efficiency and poor precision. A new quality factor measurement method is proposed. The principle of the method is that the excitation signal is applied to the driving end of the gyroscope to collect the corresponding attenuation signal of the driving end, and the frequency and slope of the attenuation signal are obtained by processing to detect the gyroscopic Quality factor. The gyroscope’s quality factor was tested with a self-designed excitation circuit, a purchased NI high-speed acquisition card and a LabVIEW-based processor. By using this method, the quality factor test time of a micromechanical gyroscope can be reduced from about 3 to 5 minutes to about 20 seconds, which greatly improves the testing efficiency and testing accuracy. Through the measurement of the gyroscopes with different quality factors, the effectiveness and correctness of this method are fully verified.