Abstract
Force Sensing Resistors (FSRs) are low-cost alternatives to load cells for pressure and force sensing. Nonetheless, FSRs exhibit a comparative lower repeatability due to their large hysteresis and creep response. The FSRs operate on the basis of the piezoresistive effect, but they have proven to exhibit a piezocapacitive effect too. A test bench has been arranged to enable both: conductance (the inverse of resistance) and capacitance readings to a total of 16 FSRs; the test bench measures capacitance using a DC input signal, whereas capacitance is estimated using an AC sourcing. Experimental results demonstrated that the capacitance measurements yielded lower drift and hysteresis error when compared to the manufacturer recommended method based upon conductance readings. The experimental results open the way for a broader usage of FSRs in applications demanding accurate force/pressure measurements. This study was carried out using 16 FlexiForce sensors (A201-1).
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