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Proceedings Paper

Transient thermoelastic dynamics of a microcantilever subject to laser irradiation
Author(s): W. Wu; O. Gottlieb; A. Shavit
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Paper Abstract

In this paper we investigate the transient thermoelastic dynamics of a microcantilever subject to laser irradiation. We formulate an initial boundary-value problem (IBVP) describing the transient vibration of a microcantilever caused by laser thermal effects in a vacuum environment. This IBVP includes two PDEs describing the coupled elastic and thermal fields where the elastic beam equation is augmented by viscoelastic damping. We study three laser power distributions having the same total power to analyze the steady state temperature distribution in the microcantilever: (i) sinusoidal sin(πx/2L), (ii) uniform and (iii) localized δ(x-a). Analytical solutions for a SiN microcantilever with these boundary conditions are determined. We reduce the IBVP to a modal dynamical system and consider its first mode response and obtain its transient decay to a stable equilibrium position. We note that the results of the above analysis are consistent with documented experimental results.

Paper Details

Date Published: 21 June 2006
PDF: 10 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63451B (21 June 2006); doi: 10.1117/12.693064
Show Author Affiliations
W. Wu, Technion - Israel Institute of Technology (Israel)
O. Gottlieb, Technion - Israel Institute of Technology (Israel)
A. Shavit, Technion - Israel Institute of Technology (Israel)


Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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