Thin film NiTi coatings on optical fiber Bragg sensors
- Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095 (United States)
- NASA Dryden Flight Research Center, Edwards, California 93523 (United States)
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.
- OSTI ID:
- 21123991
- Journal Information:
- Applied Physics Letters, Vol. 93, Issue 3; Other Information: DOI: 10.1063/1.2961002; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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