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Title: Static characterization of a soft elastomeric capacitor for non destructive evaluation applications

A large and flexible strain transducer consisting of a soft elastomeric capacitor (SEC) has been proposed by the authors. Arranged in a network setup, the sensing strategy offers tremendous potential at conducting non-destructive evaluation of large-scale surfaces. In prior work, the authors have demonstrated the performance of the sensor at tracking strain history, localizing cracks, and detecting vibration signatures. In this paper, we characterize the static performance of the proposed SEC. The characterization includes sensitivity of the signal, and temperature and humidity dependences. Tests are conducted on a simply supported aluminum beam subjected to bending as well as on a free standing sensor. The performance of the SEC is compared against off-the-shelf resistance-based strain gauges with resolution of 1 με. A sensitivity of 1190 pF/ε is obtained experimentally, in agreement with theory. Results also show the sensor linearity over the given level of strain, showing the promise of the SEC at monitoring of surface strain.
Authors:
 [1] ;  [2] ; ;  [3] ; ;  [4]
  1. Civil, Construction and Environmental Engineering, Iowa State University (United States)
  2. Civil, Construction and Environmental Engineering, Iowa State University and Electrical and Computer Engineering, Iowa State University (United States)
  3. Electrical and Computer Engineering, Iowa State University (United States)
  4. Materials Science and Engineering, Iowa State University (United States)
Publication Date:
OSTI Identifier:
22263766
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1581; Journal Issue: 1; Conference: 40. annual review of progress in quantitative nondestructive evaluation, Baltimore, MD (United States), 21-26 Jul 2013, 10. international conference on Barkhausen noise and micromagnetic testing, Baltimore, MD (United States), 21-26 Jul 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM; BEAMS; CAPACITORS; COMPARATIVE EVALUATIONS; SENSITIVITY; SENSORS; SIGNALS; STRAIN GAGES; STRAINS; SURFACES; TRANSDUCERS