Chalcogenide fiber loop probe for the mid-IR spectroscopy of oil products
Elena A. Romanova, Svetlana Korsakova, Andrey G. Rozhnev, А.P. Velmuzhov, Т.V. Kotereva, М.В. Суханов, V.S. Shiryaev
Abstract
A theoretical approach based on the electromagnetic theory of optical fibers has been applied in the analysis of the evanescent modes of a chalcogenide fiber bend used as a probe in a fiber-based spectroscopic sensor, by the example of the detection of small amounts of an antigel additive in a diesel fuel. The absorbance of the loop probe calculated for each mode was compared with the results of spectrometer-based measurements. The role of the higher-order evanescent modes of a fiber bend has been revealed. The efficiency of using a loop probe has been shown to depend on conditions of light launching into the probe.
Topics & Concepts
ChalcogenideOpticsMaterials scienceSpectrometerOptical fiberFiberSpectroscopyAbsorbanceFiber optic sensorChalcogenide glassRefractive indexOptoelectronicsPhysicsQuantum mechanicsComposite materialPhotonic Crystal and Fiber OpticsSpectroscopy and Chemometric AnalysesSpectroscopy and Laser Applications