Modeling of Microcantilever based Nuclear Microbatteries

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Microcantilevers are extremely versatile and are used as sensors, actuators and in many other microsystems. In this work, mathematical model of a microcantilever based actuator, which can be driven by nuclear radiation, is developed. This actuator can be used as micro-battery or micro-generator. Microcantilever tip portion is exposed to nuclear radiation from lower side and becomes charged because of emission of electrons from the radioactive element. Thus an electrostatic attraction is created between base and the cantilever tip, which gradually bends the tip and discharges the electrons. Now electrostatic attraction disappears for a moment and then, the process repeats and thus the cantilever sets into oscillations. The piezoelectric plate on the microcantilever produces electric pulses, and can be used to generate electricity. The mechanical equivalent of the microcantilever is developed. In the final electrical model, the force-voltage (or mass-inductance) analogy is considered. The transfer function obtained is used to derive the system performance. The model developed is subjected to different input conditions and the output is observed. The results of the analytical model are compared with the model developed in ANSYS/Multiphysics. Such microcantilevers offer an attractive power source for MEMS based actuators, which require high power density or long life.

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Journal: TechConnect Briefs
Volume: 3, Nanotechnology 2008: Microsystems, Photonics, Sensors, Fluidics, Modeling, and Simulation – Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 3
Published: June 1, 2008
Pages: 466 - 469
Industry sector: Sensors, MEMS, Electronics
Topic: MEMS & NEMS Devices, Modeling & Applications
ISBN: 978-1-4200-8505-1