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Sensors 2015, 15(9), 24530-24552; doi:10.3390/s150924530

Research on the Sensing Performance of the Tuning Fork-Probe as a Micro Interaction Sensor

1
and
1,2,*
1
Department of Engineering Mechanics, AML, Tsinghua University, Beijing 100084, China
2
Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editor: Stefano Mariani
Received: 25 July 2015 / Accepted: 17 September 2015 / Published: 23 September 2015
(This article belongs to the Section State-of-the-Art Sensors Technologies)
View Full-Text   |   Download PDF [3496 KB, uploaded 24 September 2015]   |  

Abstract

The shear force position system has been widely used in scanning near-field optical microscopy (SNOM) and recently extended into the force sensing area. The dynamic properties of a tuning fork (TF), the core component of this system, directly determine the sensing performance of the shear positioning system. Here, we combine experimental results and finite element method (FEM) analysis to investigate the dynamic behavior of the TF probe assembled structure (TF-probe). Results from experiments under varying atmospheric pressures illustrate that the oscillation amplitude of the TF-probe is linearly related to the quality factor, suggesting that decreasing the pressure will dramatically increase the quality factor. The results from FEM analysis reveal the influences of various parameters on the resonant performance of the TF-probe. We compared numerical results of the frequency spectrum with the experimental data collected by our recently developed laser Doppler vibrometer system. Then, we investigated the parameters affecting spatial resolution of the SNOM and the dynamic response of the TF-probe under longitudinal and transverse interactions. It is found that the interactions in transverse direction is much more sensitive than that in the longitudinal direction. Finally, the TF-probe was used to measure the friction coefficient of a silica–silica interface. View Full-Text
Keywords: tuning fork; scanning near-field optical microscopy; finite element method; force or interaction sensing harmonic response tuning fork; scanning near-field optical microscopy; finite element method; force or interaction sensing harmonic response
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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. (CC BY 4.0).

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Gao, F.; Li, X. Research on the Sensing Performance of the Tuning Fork-Probe as a Micro Interaction Sensor. Sensors 2015, 15, 24530-24552.

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