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Sensors 2011, 11(9), 8836-8854; doi:10.3390/s110908836
Article

Detailed Study of Amplitude Nonlinearity in Piezoresistive Force Sensors

* ,
,
 and
Centre for Automation and Robotics, UPM-CSIC, Ctra. Campo Real Km 0.2, Madrid 28500, Spain
* Author to whom correspondence should be addressed.
Received: 28 July 2011 / Revised: 8 September 2011 / Accepted: 9 September 2011 / Published: 14 September 2011
(This article belongs to the Section Physical Sensors)
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Abstract

This article upgrades the RC linear model presented for piezoresistive force sensors. Amplitude nonlinearity is found in sensor conductance, and a characteristic equation is formulated for modeling its response under DC-driving voltages below 1 V. The feasibility of such equation is tested on four FlexiForce model A201-100 piezoresistive sensors by varying the sourcing voltage and the applied forces. Since the characteristic equation proves to be valid, a method is presented for obtaining a specific sensitivity in sensor response by calculating the appropriate sourcing voltage and feedback resistor in the driving circuit; this provides plug-and-play capabilities to the device and reduces the start-up time of new applications where piezoresistive devices are to be used. Finally, a method for bypassing the amplitude nonlinearity is presented with the aim of reading sensor capacitance.
Keywords: piezoresistive; force; sensor; nonlinear; model; tanh; piezocapacitive; FlexiForce piezoresistive; force; sensor; nonlinear; model; tanh; piezocapacitive; FlexiForce
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Paredes-Madrid, L.; Emmi, L.; Garcia, E.; De Santos, P.G. Detailed Study of Amplitude Nonlinearity in Piezoresistive Force Sensors. Sensors 2011, 11, 8836-8854.

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