Ian Yulianti, Putut Marwoto, Budi Astuti, Ngurah Made D P, Fianti, Dhea Paradita, Teguh Darsono, Nor Hafizah Ngajikin, Maslina Yaacob, Noran Azizan Cholan
This paper demonstrates an optical waveguide based- refractive index (RI) sensor using the temperature compensation method. The optical waveguide was formed using a polymethylmethacrylate sheet as the cladding material and unsaturated polyester resin as the core material. The sensor design consists of two input waveguide branches, a sensing area and an output branch. Two light emitting diodes with wavelength of 530 nm and 660 nm were used as light sources. In this work, temperature compensation was done by dual-wavelength technique in which RI and temperature sensitivities were measured at two different wavelengths at 530 nm and 660 nm. Based on the RI and temperature sensitivities, temperature compensation was implemented. Experimental findings indicated that the average relative error of the uncompensated measurement using the light source of 530 nm and 660 nm were 0.4372% and 0.2749%, respectively. Meanwhile, the average error of the temperature compensation method was 0.0344%. Hence, the temperature compensation method provides measurement error up to 92% lower compared to the uncompensated method. As such, the proposed dual-wavelength compensation method could effectively improve the RI measurement accuracy. © 2023 The Author(s). Published by IOP Publishing Ltd
Department of Physics, Universitas Negeri Semarang, Semarang, 50229, Indonesia; Faculty of Electrical and Engineering, Tun Hussein Onn University of Malaysia, Johor, Batu Pahat, 86400, Malaysia
