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

Matute, Arnaldo; Paredes-Madrid, Leonel; Moreno, Gelman; Cárdenas, Fabián; Palácio, Carlos

doi:10.1155/2018/6561901

Cited by 10 publications

(12 citation statements)

References 35 publications

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“…The same conclusion can be stated for the other voltage intervals of Equations (5) and (6). Concerning the hysteresis error, a similar demonstration to Equation (10) has been presented by the authors in Reference [22].…”

Section: Error Sources and Types Of Error In Fsrssupporting

confidence: 78%

“…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: 62%

“…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: 71%

“…The circuits shown in Figures 3 and 5 can drive a single FSR, but multiple FSRs can be simultaneously handled if multiplexers are employed [22,37]. Before proceeding with the experimental results, it is necessary to discuss the relationship between the applied stress, σ, and the parameters s, R FSR , C FSR , and f. The inter-particle separation, s, is reduced for larger stresses, and consequently, Equation (2) and Equations (4)-(6) predict a lower R FSR for incremental stresses.…”

Section: Experimental Setup Results and Discussionmentioning

confidence: 99%

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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: Error Sources and Types Of Error In Fsrssupporting

confidence: 78%

Section: Trimming the Offset Resistances For R 1 = Rsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 71%

Section: Experimental Setup Results and Discussionmentioning

confidence: 99%

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

et al. 2018

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“…Metal rubber is made by twisting wire into a spiral coil, winding the spiral coil according to a certain process, and finally cold stamping it [3]. Metal rubber is a typical nonlinear material, and it has an obvious hysteresis characteristic [4,5]. It is a good damping material because of its vibration absorption performance.…”

Section: Introductionmentioning

confidence: 99%

Damping Characteristics of Metal Rubber in the Pipeline Coating System

Xiao

Bai

Xue

et al. 2018

Shock and Vibration

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e reduction of vibration in submarine pipeline systems at high temperatures has always been a difficult problem. is paper aims to reduce the vibration of pipeline systems by using coated metal rubber. A theoretical model of the cladding damping structure, formed on the basis of the bilinear hysteresis model, is established. e mechanical model of the single degree of freedom hysteretic system is linearly equivalent to using the linearization method. e theoretical analysis indicates that the regularity of the stiffness of metal rubber decreases, and the damping increases, with the increase of the excitation amplitude. Experimental verification confirmed this analysis after an experimental system for pipelines coated by metal rubber was developed. A method for preparing the thin sheet of metal rubber, which is the damping layer, was introduced. At the same time, the force transfer rate and the structural loss factor were proposed to characterize the damping performance of the cladding damping structure. e vibration absorption characteristics of the cladding damping structure, along with its forming density, number of coating layers, and excitation magnitude, are investigated by means of the experimental method. e results indicate that the damping performance of metal rubber decreases with the increase of forming density, and the damping performance of metal rubber increases with the increase of the number of cladding layers and the magnitude of excited vibration.

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An optoelectronic muscle contraction sensor for prosthetic hand application

Sharma

Prakash

Sharma

2023

Review of Scientific Instruments

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Surface electromyography (sEMG) is considered an established means for controlling prosthetic devices. sEMG suffers from serious issues such as electrical noise, motion artifact, complex acquisition circuitry, and high measuring costs because of which other techniques have gained attention. This work presents a new optoelectronic muscle (OM) sensor setup as an alternative to the EMG sensor for precise measurement of muscle activity. The sensor integrates a near-infrared light-emitting diode and phototransistor pair along with the suitable driver circuitry. The sensor measures skin surface displacement (that occurs during muscle contraction) by detecting backscattered infrared light from skeletal muscle tissue. With an appropriate signal processing scheme, the sensor was able to produce a 0–5 V output proportional to the muscular contraction. The developed sensor depicted decent static and dynamic features. In detecting muscle contractions from the forearm muscles of subjects, the sensor showed good similarity with the EMG sensor. In addition, the sensor displayed higher signal-to-noise ratio values and better signal stability than the EMG sensor. Furthermore, the OM sensor setup was utilized to control the rotation of the servomotor using an appropriate control scheme. Hence, the developed sensing system can measure muscle contraction information for controlling assistive devices.

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

Cited by 10 publications

References 35 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

Damping Characteristics of Metal Rubber in the Pipeline Coating System

An optoelectronic muscle contraction sensor for prosthetic hand application

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