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Ultrahigh sensitive long-period fiber grating-based sensor for detection of adulterators in biofuel

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Abstract

An ultra-sensitive sensor based on dual resonance long-period fiber gratings has been fabricated for the detection of methanol and water content in ethanol. The developed sensor is compact in size and light weight and employs a highly accurate spectral interrogation technique for adulterant detection, increasing its applicability compared to conventional surface plasmon resonance based sensors, which are generally expensive, as they require metal film deposition. We demonstrate that the sensor is capable of achieving sensitivity of 802.66 pm/V% methanol and 749.06 pm/V% water in the ethanol solution. The estimated detection limit using the experimental data and spectral resolution of the interrogator is found to be ${\sim}1.3 \times {10^{- 3}}\; {\rm V}\%$ in the 1300–1700 nm wavelength range. We also present the sensor’s theoretical study, and good agreement is found between theoretical and experimental results.

© 2021 Optical Society of America

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