Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 161, Issue 1-2, Pages 66-71Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2010.05.024
Keywords
Strain sensor; Microstrain; Photonic crystal
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This paper reports micrometer-scale strain measurements that are enabled through the observed wavelength shift in a stretched surface photonic crystal narrow bandwidth optical reflectance filter. The photonic crystal optical filter is comprised of a 550 nm period, dielectric-coated linear grating structure, which was fabricated on the surface of a thin sheet of silicone rubber. When stretched, the change in grating period induced a change in the wavelength of light coupled into the photonic crystal, which could be measured using a spectrometer. The observed wavelength change was 4.53 nm per 1% strain and was linear up to 3.75% strain. The measurement was affected by temperature fluctuations, which could be compensated. The resolution of the measurement was 78 mu epsilon. (C) 2010 Elsevier B.V. All rights reserved.
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