Abstract
This paper presents the design principles and fabrication techniques for simultaneously forming non-coplanar resonant beams and crab-leg supporting beams of dual-axis bulk micromachined resonant accelerometers by masked-maskless combined anisotropic etching. Four resonant beams are located at the surface of a silicon substrate, whereas the gravity centre of a proof mass lies within the neutral plane of four crab-leg supporting beams on the same substrate. Compared with early reported mechanical structures, the simple structure not only eliminates the bending moments caused by in-plane acceleration, and thereby avoiding the rotation of the proof mass, but also providing sufficiently small rigidity to X and Y axes accelerations, potentially leading to a large sensitivity for measuring the in-plane acceleration.
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Project (No. 61076110) supported by the National Natural Science Foundation of China
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Han, Jq., Feng, Rs., Li, Y. et al. Microfabrication technology for non-coplanar resonant beams and crab-leg supporting beams of dual-axis bulk micromachined resonant accelerometers. J. Zhejiang Univ. - Sci. C 14, 65–74 (2013). https://doi.org/10.1631/jzus.C1200251
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DOI: https://doi.org/10.1631/jzus.C1200251
Key words
- Resonant accelerometer
- Maskless etching
- Bulk micromachining technology
- Microelectromechanical system (MEMS)
- Microsensor