Table of Contents
Physics Research International
Volume 2014, Article ID 320324, 8 pages
Research Article

Liquid Mass Sensing Using Resonating Microplates under Harsh Drop and Spray Conditions

1Department of Physics and Optical Engineering, Ort Braude College, 21982 Karmiel, Israel
2School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, 69978 Tel Aviv, Israel

Received 28 July 2014; Accepted 20 December 2014; Published 31 December 2014

Academic Editor: Sergey B. Mirov

Copyright © 2014 Said Mahajne et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We have performed in situ real time mass sensing of deposited liquid volatile droplets and sprays using plate-like microstructures, with robust and reusable performance attained over harsh conditions and multiple cycles of operation. A home-built electrooptical sensing system in ambient conditions has been used. The bimorph effect on the resonant frequency of altered mass loading, elasticity, and strain had been carefully compared, and the latter were found to be negligible in the presence of nonviscous liquids deposited on top of our microplate devices. In resonant mode, the loaded mass has been estimated from measured resonant frequency shifts and interpreted from a simple, uniformly deposited film model. A minimum submicrogram detectable mass was estimated, suggesting the system’s potential for robust, fast, and reusable sensing capabilities, in the presence of volatile liquids under harsh operation conditions.