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Journal of Sensors
Volume 2016, Article ID 8341656, 5 pages
http://dx.doi.org/10.1155/2016/8341656
Research Article

Numerical Study on Mass Sensitivity of Magnetoelastic Biosensors with Concentrated Mass Load under Different Resonance Modes

School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Received 22 March 2016; Revised 16 May 2016; Accepted 6 June 2016

Academic Editor: Andrea Cusano

Copyright © 2016 Kewei Zhang and Yuesheng Chai. 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.

Abstract

Magnetoelastic biosensors are an important type of resonant mode based mass-sensing device, for which mass sensitivity is a critical parameter to evaluate their performance. In this work, the effect of concentrated mass position on mass sensitivity () of a magnetoelastic sensor under different resonance modes was theoretically studied. The effect of magnitude of loading mass on mass sensitivity for the first resonance mode was also studied. The results indicated that mass sensitivity as the function of loading position for all resonance modes was consistent with the law of function . By comparing the mass sensitivity for the sensor attached with concentrated mass and uniform mass, it was found that mass sensitivity was linearly proportional to the sum of the squares of the displacement of each loading point. For the first resonance mode, when the loading position satisfied or , mass sensitivity decreased with loading mass increasing. The opposite trend was observed when or . When the concentrated mass was loaded at the nodal point (i.e., ), mass sensitivity was always zero no matter how the loading mass changed.