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KALFOS - A Validation Facility for Strain Transfer Characterization of Surface-Applied Strain Sensors
Technical Paper
2011-01-2606
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Strain sensors embedded in or attached to structural components have to measure the real deformation of the structure over the whole period of use. The user must know how reliably installed sensors provide strain measurement results. For this purpose, test facilities or coupon tests are used. In order to characterize the strain transfer quality from the host structure into surface-applied strain sensors, a unique testing facility has been developed. This facility can be used both for fiber optic and resistance strain sensors. Originally developed for fiber Bragg grating based sensors, the KALFOS facility (= \bc\ba\blibration of \bfiber \boptic \bsensors) uses Digital Image Correlation (DIC) and Electronic Speckle Pattern Interferometer (ESPI) as unbiased referencing methods. It is possible to determine experimentally the strain transfer mechanism under combined thermal and mechanical loading conditions. This experimental characterization method will reveal weaknesses in commonly used strain sensors, and the investigation of the material systems used for fiber optic and other strain sensors (particularly the coating/substrate - adhesive combination). The KALFOS facility allows matching of specific measurement requirements with environmental conditions.
Authors
Citation
Habel, W., Kusche, N., Munzenberger, S., and Schukar, V., "KALFOS - A Validation Facility for Strain Transfer Characterization of Surface-Applied Strain Sensors," SAE Technical Paper 2011-01-2606, 2011, https://doi.org/10.4271/2011-01-2606.Also In
References
- VDI/VDE/GESA Guideline 2660 Experimental Stress Analysis - Optical Strain Sensor based on fibre Bragg grating Basics, Characteristics and its Testing Beuth-Verlag Berlin Juli 2010 http://www.beuth.de
- Schlüter (Schukar), V.G. Kusche, N. Habel, W.R. How reliably do fibre Bragg grating patches perform as strain sensors? EWOFS 2010 4th European workshop on optical fibre sensors, Proc. of SPIE 76533 2010
- Schlüter (Schukar), V.G. Entwicklung eines experimentell gestützten Bewertungsverfahrens zur Optimierung und Charakterisierung der Dehnungsübertragung oberflächenapplizierter Faser-Bragg-Gitter-Sensoren (Development of an experimentally-based evaluation method for optimisation and characterisation of the strain transfer of surface-applied fibre Bragg grating sensors) Dissertation TU Berlin 2009 BAM-Dissertationsreihe, Band 56 2010