16 May 2008 Highly accurate micro-displacement measurement based on Gaussian-chirped tilted fiber Bragg grating
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Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 700417 (2008) https://doi.org/10.1117/12.785637
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia
Abstract
Intensity-referenced and temperature-independent high accuracy displacement measurement is demonstrated by using a Gaussian-chirped tilted fiber Bragg grating (TFBG). A specially designed bending cantilever beam is used to provide a displacement-induced Gaussian-strain-gradient and internal tilt angle modulation along the sensing TFBG. Compared with a straight FBG, the peak intensity of the Bragg resonance in the TFBG shows an improved sensitivity to the displacement but is immune from the spatially uniform temperature changes. A displacement resolution up to 1×10-3 mm and thermal fluctuation less than 2% full-scale for a temperature range of 0~80°C are experimentally achieved.
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Tuan Guo, Jacques Albert, Chengkun Chen, Alexei Ivanov, Albane Laronche, "Highly accurate micro-displacement measurement based on Gaussian-chirped tilted fiber Bragg grating", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700417 (16 May 2008); doi: 10.1117/12.785637; https://doi.org/10.1117/12.785637
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