The use of complex impedance spectroscopy measurements for improving strain sensor performance

Mapa, Ludmila Marotta; Golin, Alana Fernandes; Costa, Cleidineia C. da; Bianchi, Rodrigo Fernando

doi:10.1016/j.sna.2019.02.001

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…TDR has been used to develop soft sensors that can detect the type, size, and position of loads with more effectiveness than rigid transmission lines. Lee et al demonstrated using TDR to measure stretchable conductor strain [23]. Additionally, TDR has been employed to detect water content in dielectric materials, which is relevant for sensing humidity in textiles [24].…”

Section: Fig 2 Schematic Illustration Of Compression Testmentioning

confidence: 99%

Quantifying the Human Perception: Development and Characterization of Textile-Based Capacitive Strain and Pressure Sensors

Warncke,

Böhmer,

Böhnke

et al. 2024

KEM

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In the research field of smart textiles, one main goal concerns quantifying environmental forces acting on the wearer's body since textiles, acting as the boundary between the two, are an excellent way of integrating sensors. Integrating strain and pressure sensors into wearables promises a simple way of monitoring a person's posture and forces acting on their body. Sensors relying on a capacitive measuring principle are highly suitable for this, as they are less sensitive to changes in temperature than resistive or inductive types. In this paper, textile-based capacitive sensors are produced by braiding conductive yarns with and without an electrically insulating TPU sheath. The produced sensors are analyzed in cyclic strain and compression tests. Moreover, their behavior under changing temperatures is tested to prove their resilience against environmental changes. To extend their capabilities from an integral measurement to a localized assessment of the strain, time-domain-reflectometry (TDR) is employed. Finally, the sensors are integrated into a flexible actuated bending beam, and their adoption for soft robotics is discussed. Strain is tested cyclically, showing good long-term stability. Pressure sensitivity is measured in a static compression test under increasing force. TDR is used to localize strain in two discreet sections of the sensor. Although strain could not be quantified through TDR, characteristic points in the measured response signal indicating the position of the strain were identified. Textile-based capacitive sensors are suitable for strain up to 10 % and pressure up to 8 N. The determined gauge factors are satisfactory, with strain sensors inherently having a higher gauge factor than pressure sensors. Furthermore, they display good long-term stability and no adverse reaction to changes in temperature. TDR is proven to provide localization of strain in flexible sensors.

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Section: Fig 2 Schematic Illustration Of Compression Testmentioning

confidence: 99%

Quantifying the Human Perception: Development and Characterization of Textile-Based Capacitive Strain and Pressure Sensors

Warncke,

Böhmer,

Böhnke

et al. 2024

KEM

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“…However, this field's main challenge is still achieving high-performance devices with ultra-sensitive detection, fast response, low consumption, reproducibility, easy fabrication, mechanical and electrical stabilities, and good portability and flexibility [5][6][7][8] . In fact, a comprehensive understanding of the physical principles underlying surface morphology, electrical behavior, and mechanical properties are desired for the design of high-performance flexible devices using solution-processable components on flexible substrates [9][10][11][12][13] . This is the case for polyaniline (PANI)-based devices used to detect harmful gases which response depends on the type (dc or ac) electrical measurements to characterize the gas under examination [13][14][15][16][17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

All-polymer-based ammonia gas sensor: applying insights from the morphology-driven ac electrical performance

Kelmer,

Costa,

Bianchi

2024

Polímeros

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This paper investigates the electrical, morphological, and mechanical behavior of ultrathin layer-by-layer polyaniline/ poly(vinyl sulfonic acid) (PANI/PVS) ultrathin films for ammonia gas sensing. Atomic force microscopy shows that the PANI/PVS surface's roughness increases almost linearly with the number of PANI/PVS bilayers, while the surface morphology varies from a rod-like structure to a film-like architecture. Impedance measurements and their representation by a Cole-Cole model confirm this transition at ~15 bilayers. The designed sensor shows low response time (< 1 min), an optimal operating frequency range (1-100 Hz), high stability and sensibility to ammonia (~ 98 kΩ/ppm), and low sensibility to strain (~ 3.6 kΩ/%). This study suggests that hopping carriers' concentration remains constant, and hopping carriers' mobility changes with the number of bilayers. The simultaneous analysis of morphology with complex impedance measurements is a strategy for enhancing the electrical performance of low-cost and flexible organic sensing devices.

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“…IntroductionThe development of many branches of science and technology requires constant improvement of the processes of measuring electrical and non-electrical parameters. A significant segment of modern sensor devices on the principle of «activator-sensor» is based on impedance spectroscopy methods, the informative parameters of which are the frequency dependences of the active and reactive components of electrical or electrochemical impedance [1]. Capacitive sensors of spatial approximation, control, deformation, chemical and biochemical analysis are built using electrical processes of charge accumulation.…”

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confidence: 99%

Universal hardware and software system of signal converting for integrated sensor devices implementation

Barylo¹,

Boyko²,

Helzhynskyy³

et al. 2020

Visnyk TNTU

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The problem of developing a universal signal converter for the construction of integrated sensors in data fusion concept is solved. Considering the requirements of modern microcircuit technique, in particular for sensory devices of the Internet of Things, the signal path of the synthesized sensors is implemented based on PSoC of 5LP Family Cypress. The testing of the developed system was carried out in the process of realization the integrated sensors of thermal analysis, optoelectronics, magnetic tracking and impedance spectroscopy.

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The use of complex impedance spectroscopy measurements for improving strain sensor performance

Cited by 5 publications

References 38 publications

Quantifying the Human Perception: Development and Characterization of Textile-Based Capacitive Strain and Pressure Sensors

Quantifying the Human Perception: Development and Characterization of Textile-Based Capacitive Strain and Pressure Sensors

All-polymer-based ammonia gas sensor: applying insights from the morphology-driven ac electrical performance

Universal hardware and software system of signal converting for integrated sensor devices implementation

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