A New Approach for Modeling Piezoresistive Force Sensors Based on Semiconductive Polymer Composites

Kalantari, Masoud; Dargahi, Javad; Kövecses, József; Mardasi, M. G.; Nouri, Sahar

doi:10.1109/tmech.2011.2108664

Cited by 95 publications

(110 citation statements)

References 33 publications

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“…This approach was moved forward for FSRs in [31], where (11) and (12) are taken into account. This analysis complements former approaches [6,8,9] where just (10) was embraced. Journal of Sensors where e is the electron's charge, m its mass, φ 0 is the height of the potential barrier, and the constant ℏ = h/2π, being h the Planck's constant.…”

Section: Consideration Of the Proposed Approach In The Simmons' Modelsupporting

confidence: 69%

“…It is straightforward to understand that u = V − R C I, but it has been already stated that R C is a function of stress. This is R C = R C σ [8,32,33]. Therefore, u is also a function of stress u = u σ and this makes the current density J highly dependent on stress.…”

Section: Consideration Of the Proposed Approach In The Simmons' Modelmentioning

confidence: 99%

“…Therefore, repeatability is affected. This is worth to remark due to the widespread use of voltage dividers as conditioning circuit [8,29,39] that do not guarantee constant voltage on the FSR. Even when the considered circuit for this work (Figure 18) is not a voltage divider but a single OpAmp inverter circuit, the lack of repeatability still appears due to other causes.…”

Section: Journal Of Sensorsmentioning

confidence: 99%

“…Moreover, its accuracy depends on the possibility of performing a correct modelling since nonlinearities are present. Thus, research endeavors are aimed at deeply understanding FSRs' behavior and also at complementing their usage with appropriate electronic conditioning circuitry and data processing techniques that could compensate errors and nonlinearities [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Consideration Of the Proposed Approach In The Simmons' Modelsupporting

confidence: 69%

Section: Consideration Of the Proposed Approach In The Simmons' Modelmentioning

confidence: 99%

Section: Journal Of Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2018

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“…The authors' proposed model imposes a voltage-dependent behavior for the tunneling conduction of FSRs; this is radically different from well-known models in the literature [6,25,26]. The authors' proposed model has demonstrated its validity by predicting-up to some extent-the sensitivity degradation of Conductive Polymer Composites.…”

Section: Review Of the Underlying Physics And Important Definitions Omentioning

confidence: 86%

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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Distributed Measurement of Deformation Magnitude and Location with a Pair of Soft Sensors

et al. 2022

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Skin‐like sensitivity, or the capability to recognize tactile information, is essential for future robots in elder care, search and rescue, entertainment and other applications involving unstructured environments. In this paper, we propose the design of a flexible one‐dimensional pressure‐sensing system that can localize deformation along a long strip and measure its magnitude with an integrated pair of sensors. The sensor system is fabricated with piezoresistive conductive foils and copper sheets encapsulated by adhesive tape with a total thickness of 0.7 mm. For the purpose of demonstration, the sensor is used to monitor the location and magnitude of kink deformation of an inflatable tube. Finite‐element modeling and simulation are conducted to investigate the behavior of the soft sensor system when subjected to kink deformation. The model‐predicted sensor output achieves good agreement with the experimental data for different deformation magnitudes. Finally, extensive experiments on a sensor prototype with dimensions of mounted on an inflatable tube are conducted to demonstrate the capability of the proposed scheme in simultaneous measurement of deformation location and magnitude. It is shown that the specific design approach minimizes the coupling of location and magnitude measurements, resulting in minimal complexity for data processing.

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A New Approach for Modeling Piezoresistive Force Sensors Based on Semiconductive Polymer Composites

Cited by 95 publications

References 33 publications

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

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

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

Distributed Measurement of Deformation Magnitude and Location with a Pair of Soft Sensors

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