Relative humidity FOS design using spherical hydrogel on no-core multimode fiber

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A. Nasiri
S. Makouei
T. Y. Rezaii

Abstract

In this paper, the design and simulation of a new optical fiber-based relative humidity (RH) sensor formed by spherical hydrogel droplets over the no-core fiber is stablished. The introduced sensor is capable of detecting humidity changes based on Evanescent waves and splice losses. Refractive index of PEGDMA hydrogel sphere changes with variation of humidity which can cause intensity changes in fiber. The sensor structure includes a no-core fiber in the length of 4 mm connected to two multimode fibers which performs sensing by three hydrogel spheres with diameter of 1 mm. The sensor operation wavelength is adjusted at 631nm. The results show that the designed structure has linear response for humidity in the range of 20 to 95%RH. In the meantime, the obtained sensitivity is about 0.13643 mW /% RH. The simulated sensor has some useful advantages in addition to having some associated with the two primary sensors including the simplicity of the structure and the sensor's function which can be explained by reduction of the length of sensing portion and increase in the sensitivity and range of humidity detection.

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How to Cite
Nasiri, A., Makouei, S., & Rezaii, T. Y. (2020). Relative humidity FOS design using spherical hydrogel on no-core multimode fiber. Advanced Electromagnetics, 8(5), 65-71. https://doi.org/10.7716/aem.v8i5.1288
Section
Research Articles

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