State of the Art Alliance of Refractive Index Sensing and Spectroscopy Techniques for Household Oils Analysis

This article presents a intermingle of refractive index (\(RI)\) sensing and spectroscopy for household oil monitoring. A spectroscopy sensing setup is shown to investigate transmission (%) and absorbance (\(AU\)) from household oil samples. Five different oil samples, olive oil, kerosene oil, red palm oil, turpentine oil, and mineral oil, are analyzed from the developed setup. The transmission (%) obtained for olive, kerosene, red palm, turpentine, and mineral oil is \(75.65\), \(72.10\), \(69.68\), \(67.12,\) and \(66.41,\) respectively. The absorbance (\(AU\)) for olive oil, kerosene oil, red palm oil, turpentine oil, and mineral oil is \(1.21 AU\), \(1.42 AU\), \(1.58 AU\), \(1.64 AU\), and \(1.77 AU\) respectively. Later a plasmonic refractive index (\(RI\)) sensor is designed and presented for household monitoring based on a \(RI\) variation. The \(RI\) range of household oils is \(1.44-1.48 RIU\) and investigated at an interval of \(0.005.\) The wavelength sensitivity (\(WS\)) obtained from the sensor model for \(X-pol.\) and \(Y-pol.\) are \(24000 nm/RIU\) and \(20000 nm/RIU,\) respectively. The amplitude sensitivity \((AS)\) of the sensor is \(21580 {RIU}^{-1}\) and \(18470 {RIU}^{-1}\) corresponding to \(X-pol\). and \(Y-pol.\) respectively. The sensor resolution (\(SR\)) of order \({10}^{-6}\) is obtained concerning both polarization modes. The figure of merit (\(FOM\)) of the sensor model is \(187.50 {RIU}^{-1}\) and \(216.21 {RIU}^{-1}\) corresponding to \(X-pol.\) and \(Y-pol.\) respectively. Finally, the novel link between the spectroscopy and \(RI\) sensing parameters is explored and presented in this article.