Electrical Equivalent Analysis of Micro Cantilever Beams for Sensing Applications

Authors: B. G. Sheeparamatti, J. S. Kadadevarmath

Abstract:

Microcantilevers are the basic MEMS devices, which can be used as sensors, actuators and electronics can be easily built into them. The detection principle of microcantilever sensors is based on the measurement of change in cantilever deflection or change in its resonance frequency. The objective of this work is to explore the analogies between mechanical and electrical equivalent of microcantilever beams. Normally scientists and engineers working in MEMS use expensive software like CoventorWare, IntelliSuite, ANSYS/Multiphysics etc. This paper indicates the need of developing electrical equivalent of the MEMS structure and with that, one can have a better insight on important parameters, and their interrelation of the MEMS structure. In this work, considering the mechanical model of microcantilever, equivalent electrical circuit is drawn and using force-voltage analogy, it is analyzed with circuit simulation software. By doing so, one can gain access to powerful set of intellectual tools that have been developed for understanding electrical circuits Later the analysis is performed using ANSYS/Multiphysics - software based on finite element method (FEM). It is observed that both mechanical and electrical domain results for a rectangular microcantlevers are in agreement with each other.

Keywords: Electrical equivalent circuit analogy, FEM analysis, micro cantilevers, micro sensors.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1110479

References:

[1] M. J. Sepaniak, P. G. Datskos, N. V. Lavrik, C. A. Tripple, “Microcantilever transducers: A new approach in Sensor Technology”, Analytical Chemistry, 74, 568A (2002).
[2] Sheeparamatti B. G, Hebbal M. S, Kadadevaramath J. S, “FEM modeling of MEMS based sensor for sensing Antibody/Antigen” Proceedings of International Conference on materials, structures and systems organized by Institute of Smart Structures and Systems(ISSS), IISc Bangalore July 28-30, 2005
[3] Sheeparamatti B. G, Hebbal M. S, Rajeshwari Sheeparamatti, Math V.B, Kadadevaramath J. S, “Simulation of Biosensor using FEM”, proceedings of the International Conference on MEMS (IMEMS-06), NTU Singapore 9 to 12 May 2006
[4] Warren C. Young, Roark’s Formulas for Stress and Strain”, McGraw- Hill, New York, 1989.
[5] Ogata K, “Modern Control Engineering”, Prentice-Hall, Englewood cliffs, N. J.1990.