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Two Novel Measurements for the Drive-Mode Resonant Frequency of a Micromachined Vibratory Gyroscope
College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China
* Author to whom correspondence should be addressed.
Received: 5 September 2013; in revised form: 1 November 2013 / Accepted: 1 November 2013 / Published: 19 November 2013
Abstract: 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.
Keywords: micromachined vibratory gyroscope; drive mode; resonant frequency; one-dimensional search; golden section
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Wang, A.; Hu, X.; Luo, B.; Jiang, M.; He, X.; Tang, K. Two Novel Measurements for the Drive-Mode Resonant Frequency of a Micromachined Vibratory Gyroscope. Sensors 2013, 13, 15770-15784.
Wang A, Hu X, Luo B, Jiang M, He X, Tang K. Two Novel Measurements for the Drive-Mode Resonant Frequency of a Micromachined Vibratory Gyroscope. Sensors. 2013; 13(11):15770-15784.
Wang, Ancheng; Hu, Xiaoping; Luo, Bing; Jiang, Mingming; He, Xiaofeng; Tang, Kanghua. 2013. "Two Novel Measurements for the Drive-Mode Resonant Frequency of a Micromachined Vibratory Gyroscope." Sensors 13, no. 11: 15770-15784.