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- Publications
- Influence
ElectroMechanical Film (EMFi) — a new multipurpose electret material
- M. Paajanen, J. Lekkala, K. Kirjavainen
- Engineering
- 1 August 2000
Abstract The ElectroMechanical Film (EMFi) is a thin, cellular, biaxially oriented polypropylene film that can be used as an electret. Having a special voided internal structure and high resistivity,… Expand
EMFi-New electret material for sensors and actuators
- J. Lekkala, M. Paajanen
- Materials Science
- 10th International Symposium on Electrets (ISE 10…
- 22 September 1999
ElectroMechanical Film (EMFi) is a new electret material with a cellular structure. EMFi's advantage over other solid polymer electrets is based on its flexibility due to the voided internal… Expand
CytoSpectre: a tool for spectral analysis of oriented structures on cellular and subcellular levels
- Kimmo Kartasalo, R. Pölönen, +4 authors P. Kallio
- Computer Science, Medicine
- BMC Bioinformatics
- 26 October 2015
TLDR
Large and broadband piezoelectricity in smart polymer-foam space-charge electrets
- G. Neugschwandtner, R. Schwoediauer, +7 authors J. Lekkala
- Physics
- 1 December 2000
Charged closed-cell microporous polypropylene foams are shown to exhibit piezoelectric resonance modes in the dielectric function, coupled with a large anisotropy in the electromechanical and elastic… Expand
Electromechanical modeling and properties of the electret film EMFI
- M. Paajanen, J. Lekkala, Hannu Välimäki
- Materials Science
- 1 August 2001
An electromechanical film can be manufactured with different thickness and elasticity. The thickness for sensor and actuator applications is typically between 30 and 70 /spl mu/m. The film is modeled… Expand
Wireless interrogation techniques for sensors utilizing inductively coupled resonance circuits
- T. Salpavaara, J. Verho, P. Kumpulainen, J. Lekkala
- Engineering
- 2010
The methods needed to interrogate passive resonance sensors are studied. A portable impedance measurement unit and the methods to extract a coupling coefficient compensated resonance frequency are… Expand
Development of a piezoelectric polymer film sensor for plantar normal and shear stress measurements
- S. Kärki, J. Lekkala, H. Kuokkanen, J. Halttunen
- Materials Science
- 31 August 2009
Abstract We have developed a new sensor prototype for plantar pressure measurements during gait. The mechanical stress at the plantar surface has two components, pressure acting normal to the surface… Expand
Piezo- and pyroelectricity of a polymer-foam space-charge electret
- G. Neugschwandtner, R. Schwoediauer, S. Bauer-Gogonea, S. Bauer, M. Paajanen, J. Lekkala
- Physics
- 30 March 2001
Charged closed-cell polypropylene polymer foams are highly sensitive and broadband piezoelectric materials with a quasistatic piezoelectric d33 coefficient about 250 pC/N and a dynamic d33… Expand
Totally passive wireless biopotential measurement sensor by utilizing inductively coupled resonance circuits
- J. Riistama, E. Aittokallio, J. Verho, J. Lekkala
- Engineering
- 1 February 2010
Abstract A measurement method to measure biopotentials with a passive LC resonator is presented. The sensor consists of an LC resonance circuit where the capacitive component is a varactor and the… Expand
A PVDF SENSOR WITH PRINTED ELECTRODES FOR NORMAL AND SHEAR STRESS MEASUREMENTS ON SOLE
- S. Kärki, Miika Kiiski, M. Mäntysalo, J. Lekkala
- Materials Science
- 2009
We have tested a method of printing electrodes on the unmetalled polyvinylidenefluoride (PVDF) material to construct a matrix version of a sensor for normal and shear stress measurements on sole. A… Expand
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