Title: Intensity modulation based optical fibre humidity sensor using Agarose Chitoson composite

Authors: Yogesh H. Patil; Amrit Ghosh

Addresses: IME Division, VBK Infra and Engineering Projects, Pune, India ' Sir Padampat Singhania University, Rajasthan, India

Abstract: Optical sensors are widely used in chemical industries to monitor humidity and hence assure machine, product, and device quality. The measurable quantity is the vaporised water (H₂O) fraction. Optical fibre-based HS have recently been developed for particular applications, with benefits and drawbacks in RH detection. A thin coating of hygroscopic material (Agarose and Chitosan) is deposited on the humidity sensor's core: 1) Agrose (100%); 2) Agarose + Chitosan (20%) (80%); 3) Agarose 40% + Chitosan (60%); 4) 60% Agarose + Chitosan (40%); 5) Agarose (80%) + Chitosan (20%) (100%). This indicates that both Agarose (40%) + Chitosan (60%) and Agarose (60%) + Chitosan (40%) composite proportions achieve the required sensitivity of 0.34 nm/% RH. The POF-HS with hygroscopic thin film coating design suggests a viable RH detection approach. A low installation cost, small size, and a wide range of visible light intensity.

Keywords: relative humidity; RI; hygroscopic substance; Agarose and Chitosan; Abbe's refractometer; plastic optical fibre; POF.

DOI: 10.1504/IJESMS.2023.131789

International Journal of Engineering Systems Modelling and Simulation, 2023 Vol.14 No.3, pp.141 - 147

Received: 13 Sep 2021
Accepted: 13 Dec 2021
Published online: 03 Jul 2023 *

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