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

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 ∼ 1.3 × 10 − 3 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.

Ultra Thin Highly Sensitive Metamaterial Absorber Based Refractive Index Sensor for Detecting Adulterants in Alcohol

“…In [31], the authors simulated how the refractive index of a methanol-ethanol solution would vary as the amount of methanol in the ethanol solution varied. This detection is made feasible by an ultra-sensitive sensor built on dual resonance long-period fiber gratings.…”

Mid-Infrared Gas Sensing Based on Electromagnetically Induced Transparency in Coupled Plasmonic Resonators

“…For illustration, the blue line shows the presence of pure ethane gas, while the red line shows the presence of pure methane gas. The refractive index changes proportionally with the percentage of the methane-ethane mixture [66], as any percentage change in the methane and ethane mixed gases will cause a shift in the curve. Moreover, to study the sensor selectivity, we found that when working near to the absorption peaks for the interesting gas, the full width at half maximum (FWHM) increases.…”