Micropower source based on piezoelectric polymers

Klimiec, Ewa; Zaraska, Krzysztof; Zaraska, W.

doi:10.1179/174367509x12554402490985

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…During selection of the material for the pressure sensors, the authors focused on permanently polarized polymer films: polyethylene -polypropylene (PE -PP) (Klimiec et al, 2008), polypropylene (PP) (Klimiec et al, 2010), polyethylene tereftalate (PET) (Klimiec et al, 2011a) and PVDF (Klimiec et al, 2011b). The main factor considered during the selection is good springiness in the required range of the pressure, because short time of recovery after removing the force, is a very important factor for sensor stability.…”

Section: Selection Of the Pressure Sensors And Its Fixationmentioning

confidence: 99%

Electronic measurement system of foot plantar pressure

Klimiec

Piekarski

Zaraska

et al. 2014

Microelectronics International

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Purpose -This paper aims to present a prototype of the diagnostic system for the examination of the distribution of the force applied by foot to substrate during usual human moving. Presented system is competitive to other currently available devices, thanks to sensors reliability, user-friendly operation manner and design based on cheap parts. The results of examinations are transmitted by radiomodem. Its recording and visualization are possible on either personal or mobile computers. Design/methodology/approach -During selection of the sensors substrate, many polymeric electrets were examined. Polyvinylidene fluoride films were selected, because they have good charge uniformity across the surface, wide range of acceptable temperatures, linear relation between mechanical stress and output signal and high resistance for squeezing. The system measures the charge generated in film. Findings -The pressures are recorded in relation to maximum value; therefore, measuring system does not require calibration. The simultaneous recording of data from all eight sensors allows tracking the signal without distortion. Originality/value -An array of sensors is installed in the shoe insole. The measuring device is fixed to the outer surface of the shoe. Its weight is 75 g. The range of transmission is suitable for examination in the natural environment, outside traditional consulting room. Software is dedicated for analysis of the pressure distribution in every moment of the foot movement. The system is suitable for examination of flat feet, diabetic foot and recovery progress after injures.

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Section: Selection Of the Pressure Sensors And Its Fixationmentioning

confidence: 99%

Electronic measurement system of foot plantar pressure

Klimiec

Piekarski

Zaraska

et al. 2014

Microelectronics International

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“…One objective of research being done in the field today is to manufacture durably polarized materials, which are known as electrets, made of polypropylene (PP). [2][3][4][5][6][7][8][9][10] This polymer is resistant to most chemical agents, is a good insulator, and has good mechanical properties, for example, elasticity across a wide range of stresses, which is important in pressure sensors. For comparative purposes, selected physical parameters of PP and PVDF that are important in the manufacture of electrets are listed in Table I.…”

Section: Introductionmentioning

confidence: 99%

Increase of Piezoelectric Constant and Thermal Durability of Polypropylene Electret by Introducing SiO2 and Kaolin Filler and Creating a Cellular Structure

Klimiec

Królikowski

Machnik

et al. 2015

Journal of Elec Materi

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This article presents a method for preparing and testing the piezoelectric properties and stability of cellular electret based on polypropylene (PP). Introducing 5% mineral filler as a mixture of crystalline silica, colloidal silica, and kaolin to isotactic polypropylene followed by a film stretching process resulted in the formation of a composite cellular structure. To manufacture electrets, the films were polarized at a constant electric field in the range from 100 V/lm to 125 V/lm, in a climatic chamber heated up to 80°C. The durability of the electrets was determined using thermostimulated discharge currents and approximate calculations of depolarization process activation energy. For electrets made of cellular films, the depolarization temperature T m at which the density of the discharge current assumes the highest value was $108°C and the activation energy was 6.25 eV. The response of the polarized composite film to mechanical stress expressed as the piezoelectric constant d 33 was about 3 times higher than for a-PP film of the prevailing atactic phase and poly(vinylidene fluoride) film without a cellular structure. In the range of stress of 1 kPa to 120 kPa it was 135 pC/N for lower stresses and 60 pC/N for higher stresses.

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“…In the present work, the fatigue test was carried out on the specimen as a function of driving voltage amplitude (5-25 V) and fatigue frequency (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). In this fatigue test, the crack growth characteristics of the PZT ceramic were examined.…”

Section: Fatigue Testing Conditionmentioning

confidence: 99%

“…A piezoelectric ceramic is a representative engineering material for the study of resonance oscillation. In recent years, piezoelectric ceramics have received special attention for their potential uses in various high performance applications, 7,8 such as ignition systems, sensors, buzzers and actuators. The piezoelectric ceramics in many applications vibrate at high frequencies in service.…”

Section: Introductionmentioning

confidence: 99%

Study of resonance fatigue properties of piezoelectric ceramics using new fatigue testing system

Okayasu

Sato

Mizuno

et al. 2012

Advances in Applied Ceramics

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To better understand the material damage of lead zirconate titanate (PZT) ceramics, fatigue tests have been carried out using a newly proposed testing system. The material damage was evaluated with the change in sonar intensity from the ceramics, where a sensing control was operated using a condenser microphone system. This testing system produces cyclic loading with a wide range of fatigue frequencies: 1 Hz-72 kHz. The influence of fatigue frequency on the fatigue properties of a PZT ceramic has been investigated, and it appeared that the fatigue strength is not linearly correlated with the fatigue frequency. The reason for this is due to the resonance caused by the oscillation. Thus, the fatigue frequency can change the severity of sample vibration. The extent of sample vibration is associated with the sonar intensity from the ceramic, which is linearly related to the crack growth rate. Details of the resonance fatigue properties have been systematically examined.

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Micropower source based on piezoelectric polymers

Cited by 8 publications

References 6 publications

Electronic measurement system of foot plantar pressure

Electronic measurement system of foot plantar pressure

Increase of Piezoelectric Constant and Thermal Durability of Polypropylene Electret by Introducing SiO2 and Kaolin Filler and Creating a Cellular Structure

Study of resonance fatigue properties of piezoelectric ceramics using new fatigue testing system

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