Mechanism of refractive index distribution measurement based on etched fiber Bragg grating

Bin-bin Luo; Ming-fu Zhao; Xiao-jun Zhou; Sheng-hui Shi; Xi Han; Ying Wang

doi:10.1117/12.974354

7 November 2012 Mechanism of refractive index distribution measurement based on etched fiber Bragg grating

Bin-bin Luo, Ming-fu Zhao, Xiao-jun Zhou, Sheng-hui Shi, Xi Han, Ying Wang

Author Affiliations +

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84219O (2012) https://doi.org/10.1117/12.974354
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

We present the mechanism of refractive index (RI) distribution measurement based on an etched fiber Bragg grating (FBG) with a residual diameter of about 5.73 μm. The etched FBG is installed in a micro-tube where the RI of the liquid medium decreases linearly alone its axis. Experimental results show that the sensitivity of RI gradient and the average sensitivity of RI of this sensor is 336.2 nm·mm/RIU and 49.44 nm/RIU, respectively, when the RI ranging from 1.330 to 1.3586. The RI distribution of the inhomogeneous liquid medium can be obtained by the RI gradient sensitivity and the average RI sensitivity.

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Bin-bin Luo, Bin-bin Luo, Ming-fu Zhao, Ming-fu Zhao, Xiao-jun Zhou, Xiao-jun Zhou, Sheng-hui Shi, Sheng-hui Shi, Xi Han, Xi Han, Ying Wang, Ying Wang, "Mechanism of refractive index distribution measurement based on etched fiber Bragg grating", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219O (7 November 2012); doi: 10.1117/12.974354; https://doi.org/10.1117/12.974354

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