A Review for Conductive Polymer Piezoresistive Composites and a Development of a Compliant Pressure Transducer

Wang, Luheng; Li, Yanling

doi:10.1109/tim.2012.2215160

Cited by 97 publications

(39 citation statements)

References 43 publications

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“…Measuring capacitance is not as straightforward as measuring resistance, which can be done with inexpensive and simple circuitry [35,36] [12,14]. However, the most concerning drawback of those approaches was costs.…”

Section: Capacitance Measurement With a Lm555 In Modified Astable Opementioning

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: Capacitance Measurement With a Lm555 In Modified Astable Opementioning

confidence: 99%

“…(ii) RFSR influence: as (35) shows, even if R ≪ RFSR, the dependence on RFSR still exists. Equations (16) through (18) are worth to be evaluated in order to recall how nonlinear the relation between resistance and stress is.…”

Section: Journal Of Sensorsmentioning

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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“…Very recently, a resistive-type pressure sensor made of self-healing materials was demonstrated, showing that the self-healing capability of natural skin could be mimicked in artificial electronic skins 21 . Many of the reported resistive-type sensors function based on bulk piezoresistivity and employ composites of insulating polymers and conductive additives as the active layer 22 . However, the performance of these devices is limited by the bulk mechanical properties of the rubbers used, for instance, poor sensitivity due to a relatively large modulus, creep and slow response time due to viscoelasticity and poor signal stability as a function of temperature due to thermal expansion.…”

mentioning

confidence: 99%

An ultra-sensitive resistive pressure sensor based on hollow-sphere microstructure induced elasticity in conducting polymer film

et al. 2014

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Pressure sensing is an important function of electronic skin devices. The development of pressure sensors that can mimic and surpass the subtle pressure sensing properties of natural skin requires the rational design of materials and devices. Here we present an ultrasensitive resistive pressure sensor based on an elastic, microstructured conducting polymer thin film. The elastic microstructured film is prepared from a polypyrrole hydrogel using a multiphase reaction that produced a hollow-sphere microstructure that endows polypyrrole with structure-derived elasticity and a low effective elastic modulus. The contact area between the microstructured thin film and the electrodes increases with the application of pressure, enabling the device to detect low pressures with ultra-high sensitivity. Our pressure sensor based on an elastic microstructured thin film enables the detection of pressures of less than 1 Pa and exhibits a short response time, good reproducibility, excellent cycling stability and temperature-stable sensing.

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“…Reducing the noise in FSRs is also an active research trend. For instance, Wang and Li have demonstrated that the vulcanization of the sensor's electrodes is an effective method for reducing noise in such devices [39]. Nonetheless, it must be remarked that a measuring uncertainty of 0.1% is a very good result considering that a repeatability error of 2.5% has been stated in the sensor's datasheet [11].…”

Section: Trimming the Offset Resistances For R 1 = Rmentioning

confidence: 99%

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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A Review for Conductive Polymer Piezoresistive Composites and a Development of a Compliant Pressure Transducer

Cited by 97 publications

References 43 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

An ultra-sensitive resistive pressure sensor based on hollow-sphere microstructure induced elasticity in conducting polymer film

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

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