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Lossy Mode Resonance Based Fiber Optic Sensor for the Detection of Acetone Concentration
Zachariah C. Alex
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Vellore Institute of Technology, India
Paper #8176 received 28 Feb 2023; revised manuscript received 7 May 2023; accepted for publication 7 May 2023; published online 7 Aug 2023
DOI: 10.18287/JBPE23.09.030306
Abstract
Diabetic ketoacidosis (DKA) is a serious complication arising due to the shortage of insulin that allows blood sugar into cells to be used as energy. As a result, the liver begins to break down fat for energy, thus producing acids called ketones. The severity of DKA influences the number of ketones produced in the human body. Therefore, the acetone level in the human body samples has the potential to be used as a biomarker towards the analysis of diabetic levels. The present work reports the development of a Lossy Mode Resonance (LMR) based fiber optic sensor to detect acetone concentration in liquids. A sensing region was developed by coating Aluminium doped Zinc Oxide (AZO) over the unclad core region using sputtering technique. The structural, morphological, and optical properties of the AZO coating were analyzed using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and an ellipsometer device. The sensor probe used to measure the acetone concentration ranging from 10 µl/ml to 800 µl/ml recorded resonance wavelength shifts in LMR1, LMR2, and LMR3 of 38 nm, 19 nm, and 9 nm, respectively. The wavelength shift was larger for LMR1 than for the other peaks with a sensor response of 4.73% and a sensitivity of 0.3 nm/(µl/ml).
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