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Exploitation of Macro-bend Induced Loss Mechanism in the Design and Construction of an Optical Fiber Glass Refractometer Operating at Multiple Wavelengths
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| Author:
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S.SRINIVASULU , DR.S.VENKATESWARARAO
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| Abstract:
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During 1970ās when the optical fibers for communication purposes were evolving, it was observed that the transmission characterizes of optical fibers were sensitive to a wide range of external geometrical perturbations. The external U-bent deformation of an optical fiber in the construction of a fiber optic sensor was proved to be superior in terms of their improved performance and considerable enhancement in the measurement of sensitivity. In the present paper, a glass rod bent in the shape of āUā joined as an extrinsic probe in the optical fiber sensor, exhibits the maximum achievable sensitivity in the determination of liquid refractive index, as a result of radiation of higher order modes as an evanescent wave with enhanced depths of penetration into the liquid cladding, was described. A set of binary liquid solutions have been prepared using toluene and water at different proportions of ratios, equating the total volume to 20ml in each solution, in the calibration of the sensor to operate in the dynamic refractive index range of 1.31252nD to 1.50915nD and in the temperature range of 10oC to 60oC operating at multiple wavelengths of source 630nm, 660nm, 820nm and 850nm. The sensor can be employed in various fields such as chemical industry, pharmaceutical, fragrant industry, food processing, biological studies, defence, science and technology, medicine, under water applications, civilian applications, etc., to measure the sensitivity at an order of 10-5, exploiting all the advantages offered by the optical fibers in the communication sector.
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| Keyword:
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Calibration, Evanescent wave, External U-bent, Multiple wavelengths, Refractive index, Toluene, Water
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| EOI:
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| DOI:
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https://doi.org/10.31838/ijpr/2021.13.02.506
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| Download:
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