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Thin film NiTi coatings on optical fiber Bragg sensors

Appl. Phys. Lett. 93, 031914 (2008); doi:10.1063/1.2961002

Published 24 July 2008

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K. P. Mohanchandra,1 S. Karnani,1 M. C. Emmons,1 W. L. Richards,2 and G. P. Carman1
1Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095, USA
2NASA Dryden Flight Research Center, Edwards, California 93523, USA
This paper describes the sputter deposition and characterization of nickel titanium (NiTi) thin film shape memory alloy onto the surface of an optical fiber Bragg grating. The NiTi coating uniformity, crystallinity, and transformation temperatures are measured using scanning electron microscope, x-ray diffraction, and differential scanning calorimeter, respectively. The strain in the optical fiber is measured using centroid calculation of wavelength shifts. Results show distinct and abrupt changes in the optical fiber signal with the four related transformation temperatures represented by the austenite-martensite forward and reverse phase transformations. These tests demonstrate a coupling present between optical energy and thermal energy, i.e., a modified multiferroic material. ©2008 American Institute of Physics
History: Received 26 February 2008; accepted 1 July 2008; published 24 July 2008
Permalink: http://link.aip.org/link/?APPLAB/93/031914/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.81.Pa
    Fiber optic sensors, fiber gyros
  • 81.15.Cd
    Deposition by sputtering
  • 42.79.Wc
    Optical coatings
  • 42.79.Dj
    Gratings
  • 42.81.Bm
    Optical fiber fabrication, cladding, and splicing
  • 42.81.Cn
    Optical fiber testing and measurement of fiber parameters
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
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REFERENCES (13)
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