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Electrostatic Excitation for the Force Amplification of Microcantilever Sensors
Advanced Materials and Nanotechnology Research Lab, Faculty of Mechanical Engineering, K.N.Toosi University of Technology, Tehran 19991-43344, Iran
* Author to whom correspondence should be addressed.
Received: 21 September 2011; in revised form: 17 October 2011 / Accepted: 17 October 2011 / Published: 25 October 2011
Abstract: This paper describes an electrostatic excited microcantilever sensor operating in static mode that is more sensitive than traditional microcantilevers. The proposed sensor comprises a simple microcantilever with electrostatic excitation ability and an optical or piezoresistive detector. Initially the microcantilever is excited by electrostatic force to near pull-in voltage. The nonlinear behavior of the microcantilever in near pull-in voltage i.e., the inverse-square relation between displacement and electrostatic force provides a novel method for force amplification. In this situation, any external load applied to the sensor will be amplified by electrostatic force leading to more displacement. We prove that the proposed microcantilever sensor can be 2 to 100 orders more sensitive compared with traditional microcantilevers sensors of the same dimensions. The results for surface stress and the free-end point force load are discussed.
Keywords: microcantilever; force amplification; pull-in voltage
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Shokuhfar, A.; Heydari, P.; Ebrahimi-Nejad, S. Electrostatic Excitation for the Force Amplification of Microcantilever Sensors. Sensors 2011, 11, 10129-10142.
Shokuhfar A, Heydari P, Ebrahimi-Nejad S. Electrostatic Excitation for the Force Amplification of Microcantilever Sensors. Sensors. 2011; 11(11):10129-10142.
Shokuhfar, Ali; Heydari, Payam; Ebrahimi-Nejad, Salman. 2011. "Electrostatic Excitation for the Force Amplification of Microcantilever Sensors." Sensors 11, no. 11: 10129-10142.