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Proceedings Paper

Design and calibration of low-cost fiber optic sensors for refractive index measurement of turbid liquids
Author(s): Pinaki Gupta-Bhaya; Anjan Kumar Ghosh; Vishal Saxena; Joseph John
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Paper Abstract

An optical fiber, stripped partially out of its cladding is used to sense refractive index of a liquid to a precision to fifth place of decimal. The dependence of the light output of the sensor on the refractive index of the test liquid is nonlinear. The light output of the sensor depends on the thickness to which the cladding is stripped. It shows both positive and negative slope with increasing refractive index of the test liquid. The slope of the plot of sensor output against liquid refractive index shows a change of sign at around the fiber refractive index. The sensor is unaffected by the presence of absorption and is insensitive to the chemical nature of the solute. The sensor is sensitive in the whole of the tested range of refractive indices 1.33 to 1.52. Experiments that show the significance of cladding modes in sensing are described.

Paper Details

Date Published: 25 October 2006
PDF: 12 pages
Proc. SPIE 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II, 63780V (25 October 2006); doi: 10.1117/12.686572
Show Author Affiliations
Pinaki Gupta-Bhaya, Indian Institute of Technology Kanpur (India)
Anjan Kumar Ghosh, Indian Institute of Technology Kanpur (India)
Vishal Saxena, Indian Institute of Technology Kanpur (India)
Joseph John, Indian Institute of Technology Kanpur (India)


Published in SPIE Proceedings Vol. 6378:
Chemical and Biological Sensors for Industrial and Environmental Monitoring II
Steven D. Christesen; Arthur J. Sedlacek; James B. Gillespie; Kenneth J. Ewing, Editor(s)

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