College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China.
Sensors (Basel). 2013 Nov 19;13(11):15770-84. doi: 10.3390/s131115770.
To investigate the drive-mode resonance frequency of a micromachined vibratory gyroscope (MVG), one needs to measure it accurately and efficiently. The conventional approach to measure the resonant frequency is by performing a sweep frequency test and spectrum analysis. The method is time-consuming and inconvenient because of the requirements of many test points, a lot of data storage and off-line analyses. In this paper, we propose two novel measurement methods, the search method and track method, respectively. The former is based on the magnitude-frequency characteristics of the drive mode, utilizing a one-dimensional search technique. The latter is based on the phase-frequency characteristics, applying a feedback control loop. Their performances in precision, noise resistivity and efficiency are analyzed through detailed simulations. A test system is implemented based on a field programmable gate array (FPGA) and experiments are carried out. By comparing with the common approach, feasibility and superiorities of the proposed methods are validated. In particular, significant efficiency improvements are achieved whereby the conventional frequency method consumes nearly 5,000 s to finish a measurement, while only 5 s is needed for the track method and 1 s for the search method.
为了研究微机械振动陀螺仪（MVG）的驱动模态谐振频率，需要对其进行准确、高效地测量。传统的测量谐振频率的方法是进行扫频测试和频谱分析。由于需要许多测试点、大量的数据存储和离线分析，因此该方法耗时且不便。在本文中，我们分别提出了两种新的测量方法，即搜索法和跟踪法。前者基于驱动模态的幅频特性，利用一维搜索技术。后者基于相频特性，采用反馈控制回路。通过详细的仿真分析，研究了它们在精度、抗噪性和效率方面的性能。基于现场可编程门阵列（FPGA）实现了一个测试系统，并进行了实验。通过与常用方法进行比较，验证了所提出方法的可行性和优越性。特别是，所提出的方法在效率方面有了显著的提高，传统的频率法完成一次测量需要近 5000 秒，而跟踪法和搜索法仅分别需要 5 秒和 1 秒。
