Mechanical design optimization of a single-axis MOEMS accelerometer based on a grating interferometry cavity for ultrahigh sensitivity

Qianbo Lu; Jian Bai; Kaiwei Wang; Shuqi Lou; Xufen Jiao; Dandan Han; Guoguang Yang

doi:10.1117/12.2235409

28 August 2016 Mechanical design optimization of a single-axis MOEMS accelerometer based on a grating interferometry cavity for ultrahigh sensitivity

Qianbo Lu, Jian Bai, Kaiwei Wang, Shuqi Lou, Xufen Jiao, Dandan Han, Guoguang Yang

Author Affiliations +

Proceedings Volume 9960, Interferometry XVIII; 99600W (2016) https://doi.org/10.1117/12.2235409
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

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.

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Qianbo Lu, Jian Bai, Kaiwei Wang, Shuqi Lou, Xufen Jiao, Dandan Han, and Guoguang Yang "Mechanical design optimization of a single-axis MOEMS accelerometer based on a grating interferometry cavity for ultrahigh sensitivity", Proc. SPIE 9960, Interferometry XVIII, 99600W (28 August 2016); https://doi.org/10.1117/12.2235409

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