Distributed strain measurement based on a fiber Bragg grating and its reflection spectrum analysis
Publicated to:Optics Letters. 21 (17): 1405-1407 - 1996-10-01 21(17), DOI: 10.1364/OL.21.001405
Authors: LeBlanc, M; Huang, SY; Ohn, M; Measures, RM; Guemes, A; Othonos, A;
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Abstract
A method of extracting the strain profile along a fiber Bragg grating from the intensity reflection spectrum is described. The procedure is based on a filter synthesis theory that relates the aperiodicity of a grating with its reflection spectrum. To illustrate the approach, we measured the strain profile near a hole in a plate and obtained a strain resolution of 80 mu epsilon. The spatial resolution depends on the strain gradient; i.e., the higher the gradient, the better the resolution. A resolution of 0.8 mm was achieved for a 5-mm grating with a gradient of 250 mu epsilon/mm. (C) 1996 Optical Society of America
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This work has been carried out with international collaboration, specifically with researchers from: Canada; Cyprus.