Abstract
FBG based refractive index sensors are widely used in sensing applications such as structural health monitoring, oil exploration, refractive index measurement of chemical solutions, etc., owing to benefits of FBG such as small size, real time monitoring, high resolution, resistant to high temperature and various chemicals, etc. In this paper, simple and high sensitive method employing a double D-shaped FBG (DDSF) for refractive index (RI) measurements of glucose solution is proposed and investigated. The operating principle is based on the exploitation of the evanescent wave interaction of the propagating light with the surrounding external environment, resulting in shift of Bragg wavelength. Wavelength shift is measured, when the refractive index of external medium changes from 1.33 to 1.43 approximately for glucose solution with varying concentrations, exhibiting a good linear relationship between them. By changing the depth of the D-shaped groove, the sensor’s sensitivity can optimize. A high sensitivity of 47.37 nm/RIU is achieved, which indicates that proposed sensor has provided high sensitivity and linearity.
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Acknowledgements
Chetna is a Master’s student at Punjab Engineering College (Deemed to be University), Chandigarh. She received her BE degree in electrical and electronics engineering from Technology Education Research Integrated Institute, Kurukshetra University, in 2014. Her area of research includes optical sensing and communication. Divya Dhawan is an associate professor in the Electronics and Communication Engineering Department at Punjab Engineering College (Deemed to be University), Chandigarh. She received her PhD in optical communication in 2017. Her research interests include optical OFDM, passive optical networks, digital system design, and optical sensors. She has a number of publications in optical communication. She is member of various technical societies, such as IEEE (Electronic Devices), ISTE, and IEI.
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Upadhyay, C., Dhawan, D. Fiber Bragg grating refractive index sensor based on double D-shaped fiber. Opt Quant Electron 55, 271 (2023). https://doi.org/10.1007/s11082-022-04500-2
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DOI: https://doi.org/10.1007/s11082-022-04500-2