Fibre optic target reflectivity sensor |
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Authors: | S Binu V P Mahadevan Pillai N Chandrasekaran |
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Institution: | (1) Department of Optoelectronics, University of Kerala, Kariavattom, Thiruvananthapuram, 695 581, Kerala, India;(2) Defence Avionics Research Establishment (DARE), DRDO, New Thippasandra Post, Bangalore, 560 075, India |
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Abstract: | This paper reports the principle of operation, the design aspects, experimentation and performance of a fibre optic target
reflectivity sensor to examine the correlation between the detector output, variation in material type and the reflectivity
properties of the materials tested. The device consists of a fibre optic transmitter, a fibre optic probe, target and a photodiode
detector. The fibre optic probe consists of two well-polished PMMA (polymethyl methacrylate) fibres cemented together along
some distance over the length. The principle of fibre optic lever displacement sensors is applied. Material effects are examined
by preparing a variety of samples namely gold coated mirror, copper, brass, aluminium, steel and galvanized iron using the
same polishing techniques. It is found that the response of the sensor changes with change of target surface. The results
show that the fibre optic probe is capable of discriminating between materials. With the use of commercially available fibre,
source and detector, the set-up proves to be simple, highly sensitive, low cost and versatile one, which can be adopted for
on-line measurement or inspection of test components. |
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Keywords: | Fibre optic displacement sensor PMMA (polymethyl methacrylate) fibre Fibre optic probe Target reflectivity Surface sensitivity Material characterization |
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