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Journal of Micro/Nanolithography, MEMS, and MOEMS

Design and analysis of an intensity modulated micro-opto-electro-mechanical accelerometer based on nonuniform cantilever beam proof mass
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Paper Abstract

Micro-opto-electro-mechanical (MOEM) accelerometers using principle of optical coupling between two waveguide structures is proposed. It consists of an antiresonant reflecting optical waveguide structure combined with a cantilever beam. Under acceleration, the output waveguide optical power changes, which is a function of acceleration. The mathematical model of the mechanical sensing element in terms of proof mass, damping, and spring constant is formulated. Here, different aspects such as beam deflection, bending stress, and breakdown acceleration are incorporated into the formulation. Based on the analysis, the optimum mechanical structure for intensity modulated MOEM accelerometers are designed. We report for a typical uniform cantiliver beam of type I (3 mm×3 mm×0.38 μm) accelerometer, mechanical sensitivity of 0.15 μm/g, minimum detectable acceleration of 4.7 μg/√Hz at an optimum power of 500 μW, range of ±25 g, a bandwidth of 1.59 kHz, breakdown acceleration of 5.1×104 g and cross-axis sensitivity of 0.001%. The results in the case of nonuinform beam cantiliver accelerations are sensitivity of 2.15 μm/g, minimum detectable acceleration of 0.27 μg/√Hz range of ±1.8 g, bandwidth of 0.411 kHz, breakdown acceleration of 2987 g and cross-axis sensitivity of 0.001%.

Paper Details

Date Published: 1 October 2006
PDF: 10 pages
J. Micro/Nanolith. 5(4) 043012 doi: 10.1117/1.2397045
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 5, Issue 4
Show Author Affiliations
Jagannath Nayak, Research Ctr. Imarat (India)
Srinivas Talabattula, Indian Institute of Science (India)
Ananth Selvarajan, Indian Institute of Science (India)
D. V. K. Sastry, Research Ctr. Imarat (India)

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