1 October 2006 Design and analysis of an intensity modulated micro-opto-electro-mechanical accelerometer based on nonuniform cantilever beam proof mass
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J. of Micro/Nanolithography, MEMS, and MOEMS, 5(4), 043012 (2006). doi:10.1117/1.2397045
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%.
Jagannath Nayak, Srinivas Talabattula, Ananth Selvarajan, D. V. K. Sastry, "Design and analysis of an intensity modulated micro-opto-electro-mechanical accelerometer based on nonuniform cantilever beam proof mass," Journal of Micro/Nanolithography, MEMS, and MOEMS 5(4), 043012 (1 October 2006). http://dx.doi.org/10.1117/1.2397045
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KEYWORDS
Waveguides

Modulation

Microopto electromechanical systems

Sensors

Electronics

Polarization

Sun

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