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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Keywords Displacement measurement, Intensity referenced, Temperature independent, Tilted fiber Bragg grating
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Conference 19th International Conference on Optical Fibre Sensors
Guo, T, Albert, J, Chen, C, Ivanov, A. (Alexei), & Laronche, A. (2008). Highly accurate micro-displacement measurement based on Gaussian-chirped tilted fiber Bragg grating. Presented at the 19th International Conference on Optical Fibre Sensors. doi:10.1117/12.785637