Journal
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
Volume 11, Issue 1, Pages 48-54Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0960-1317/11/1/308
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A monolithic capacitive triaxial accelerometer using a highly symmetric quad-beam structure with a single seismic mass is developed. The structure of the accelerometer is analysed in detail theoretically and numerically. Static and modal simulations with a finite element method simulator are done to analyse the mechanical response at accelerations of different directions. The simulated results show that the accelerometer can sense triaxial acceleration separately and synchronously. It has sensitivities of about 7.66, 6.08 and 6.08 fF g(-1) in the z-axis, x-axis and y-axis, respectively, and has nearly zero cross-axis sensitivity theoretically. Moreover, some design optimizations are made to improve its performance. Finally, the fabrication and the basic performance of the device are presented.
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