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

Matute, Arnaldo; Paredes-Madrid, Leonel; Gutierrez, Elkin I.; Vargas, Carlos Arturo Parra

doi:10.1109/icsens.2017.8234039

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…Considerable reduction in the hysteresis error is also reported in Figure 8. Nonetheless, this is not surprising since previous authors' work has demonstrated that CFSR measurements yield lower drift and hysteresis errors [21,22]. This statement is also supported by the inequality of Equation (10).…”

Section: Trimming the Offset Resistances For R 1 = Rsupporting

confidence: 66%

“…Similarly, the total resistance of an FSR (R FSR ) can be computed from the series and parallel connections of R i c and R i bulk , thus yielding R c, and R bulk ; see Figure 1d. Previous authors' works have demonstrated that performing capacitance readings on FSRs yield a lower hysteresis error [21,22], this has been experimentally measured and also predicted by theoretical models which are later addressed in Section 2.3.…”

Section: Introductionmentioning

confidence: 98%

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Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

et al. 2018

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Force Sensing Resistors (FSRs) are manufactured from a blend of conductive nanoparticles dispersed in an insulating polymer matrix. FSRs exhibit large amounts of hysteresis and drift error, but currently, a great effort is placed on improving their performance through different techniques applied during sensor manufacturing. In this article, a novel technique for improving the performance of FSRs is presented; the method can be applied to already-manufactured sensors, which is a clear benefit of the proposed procedure. The method is based on driving the sensors with a modified-astable 555 oscillator, in which the oscillation frequency is set from the sensor's capacitance and resistance. Considering that the sensor's capacitance and resistance have opposite signs in the drift characteristic, the driving circuit provides self-compensated force measurements over extended periods of time. The feasibility of the driving circuit to reduce hysteresis and to avoid sensitivity degradation is also tested. In order to obtain representative results, the experimental measurements from this study were performed over eight FlexiForce A201-25 sensors.

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Section: Trimming the Offset Resistances For R 1 = Rsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 98%

Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

et al. 2018

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“…Previous works [12][13][14][15][16] have demonstrated that FSRs based on CPCs also embrace a capacitive effect. Their capacitance can be measured and it varies when the CPC is subjected to mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

A Novel and Inexpensive Approach for Force Sensing Based on FSR Piezocapacitance Aimed at Hysteresis Error Reduction

et al. 2018

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Force-sensing resistors (FSRs) are inexpensive alternatives to load cells. They are suitable for applications where noninvasive devices are needed to measure force, stress, or pressure. However, they have been proved to be hysteresis prone and offer nonrepeatable readings due to their highly voltage-dependent electrical resistance. A piezocapacitive effect has been found as an alternative phenomenon that is able to offer force-dependent readings of capacitance with less hysteresis error. Also, this capacitance is not dependent on voltage, which also improves repeatability in force measurements. Since measuring capacitance is more expensive than resistance, the least costly conditioning circuitry is desired. An inexpensive alternative using an LM555 that oscillates depending on capacitance is here presented. Hysteresis and repeatability errors have been reduced for a widespread-used force-sensing resistor brand.

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“…Magnitude dis crepancies between FSR and forceplate COP excursions have been documented in previous research involving FSRs [8]. We realize that inexpensive FSRs may not intended for accurate force detection due to drift and hysteresis [9]. However, it may not be possible (or necessary) to have accurate COP excursion values as long as the device can still detect differences in movements.…”

Section: Discussionmentioning

confidence: 62%

Design and Evaluation of the PosturSense Cushion

Garag

Chen

McDonagh

et al. 2018

2018 Design of Medical Devices Conference

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In recent history, the convention that adopting an ‘upright’ seated posture would decrease lumbar strain has shifted. The idea of dynamically varying seated posture is being considered as optimal for reducing lumbar strain and possibly lower back pain [1–2]. Thus, it would seem vital to design a device that helps alert users of the need to change their seated postures in workplace or study environments.

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

Cited by 12 publications

References 11 publications

Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

A Novel and Inexpensive Approach for Force Sensing Based on FSR Piezocapacitance Aimed at Hysteresis Error Reduction

Design and Evaluation of the PosturSense Cushion

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