Characterization of drift and hysteresis errors in force sensing resistors considering their piezocapacitive effect

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 exh...

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Bibliographic Details
Published in2017 IEEE SENSORS pp. 1 - 3
Main Authors Matute, Arnaldo, Paredes-Madrid, Leonel, Gutierrez, Elkin, Parra Vargas, Carlos A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Capacitance
Capacitance measurement
drift
Force
Force measurement
Force Sensing Resistor (FSR)
force sensor
Hysteresis
Measurement uncertainty
piezocapacitance
pressure sensor
Sensors
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Summary: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).
DOI:10.1109/ICSENS.2017.8234039