Document Type

Conference Proceeding

Language

eng

Format of Original

6 p.

Publication Date

11-2010

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Source Publication

2010 IEEE Sensors Proceedings

Source ISSN

978-1-4244-8170-5

Original Item ID

doi: 10.1109/ICSENS.2010.5690518

Abstract

To achieve higher quality factors (Q) for microcantilevers used in liquid-phase sensing applications, recent studies have explored the use of the lateral (in-plane) flexural mode. In particular, we have recently shown that this mode may be excited electrothermally using integrated heating resistors near the micro cantilever support, and that the resulting increase in Q helps to make low-ppb limits of detection a possibility in liquids. However, because the use of electrothermally excited, liquid-phase, microcantilever-based sensors in lateral flexure is relatively new, theoretical models are lacking. Therefore, we present here a new analytical model for predicting the vibratory response of these devices. The model is also used to successfully confirm the validity of our previously derived Q formula, which was based on a single-degree-of-freedom (SDOF) model and a harmonic tip force. Comparisons with experimental data show that the present model and, thus, the analytical formula provide excellent Q estimates for sufficiently thin beams vibrating laterally in water and reasonable upper-bound estimates for thicker beams.

Comments

Accepted version. Published as part of the proceedings of the conference, 2010 IEEE Sensors, 2011: 1399-1404. DOI. © 2010 Institute of Electrical and Electronics Engineers (IEEE). Used with permission.

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