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Proceedings Paper

Mechanical design optimization of a single-axis MOEMS accelerometer based on a grating interferometry cavity for ultrahigh sensitivity
Author(s): Qianbo Lu; Jian Bai; Kaiwei Wang; Shuqi Lou; Xufen Jiao; Dandan Han; Guoguang Yang
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Paper Abstract

The ultrahigh static displacement-acceleration sensitivity of a mechanical sensing chip is essential primarily for an ultrasensitive accelerometer. In this paper, an optimal design to implement to a single-axis MOEMS accelerometer consisting of a grating interferometry cavity and a micromachined sensing chip is presented. The micromachined sensing chip is composed of a proof mass along with its mechanical cantilever suspension and substrate. The dimensional parameters of the sensing chip, including the length, width, thickness and position of the cantilevers are evaluated and optimized both analytically and by finite-element-method (FEM) simulation to yield an unprecedented acceleration-displacement sensitivity. Compared with one of the most sensitive single-axis MOEMS accelerometers reported in the literature, the optimal mechanical design can yield a profound sensitivity improvement with an equal footprint area, specifically, 200% improvement in displacement-acceleration sensitivity with moderate resonant frequency and dynamic range. The modified design was microfabricated, packaged with the grating interferometry cavity and tested. The experimental results demonstrate that the MOEMS accelerometer with modified design can achieve the acceleration-displacement sensitivity of about 150μm/g and acceleration sensitivity of greater than 1500V/g, which validates the effectiveness of the optimal design.

Paper Details

Date Published: 28 August 2016
PDF: 9 pages
Proc. SPIE 9960, Interferometry XVIII, 99600W (28 August 2016); doi: 10.1117/12.2235409
Show Author Affiliations
Qianbo Lu, Zhejiang Univ. (China)
Jian Bai, Zhejiang Univ. (China)
Kaiwei Wang, Zhejiang Univ. (China)
Shuqi Lou, Zhejiang Univ. (China)
Xufen Jiao, Zhejiang Univ. (China)
Dandan Han, Zhejiang Univ. (China)
Guoguang Yang, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 9960:
Interferometry XVIII
Katherine Creath; Jan Burke; Armando Albertazzi Gonçalves, Editor(s)

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