Simultaneous measurement of bending and temperature based on a single sampled chirped fiber Bragg grating embedded on a flexible cantilever beam

Young Geun Han, Xinyong Dong, J. H. Lee, S. B. Lee

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

We propose and experimentally demonstrate a simple and practical scheme for simultaneous measurement of bending and temperature based on a single sampled chirped fiber Bragg grating with multiple resonant peaks, which is embedded on a flexible cantilever beam. The wavelength spacing of the grating can be changed by adjusting the bending curvature change, since the compressive strain gradient induced by the bending of the cantilever beam changes the chirp ratio of the fiber grating. However, the wavelength spacing of the fiber grating is not changed by the temperature variation; the multiple resonant wavelengths are only shifted into the longer wavelength because of the positive thermal-expansion and thermo-optic coefficients of the fiber grating. Consequently, the proposed scheme allows for discrimination between two effects of bending and temperature.

Original languageEnglish
Pages (from-to)2839-2841
Number of pages3
JournalOptics Letters
Volume31
Issue number19
DOIs
StatePublished - 1 Oct 2006

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