Design and calibration of low-cost fiber optic sensors for refractive index measurement of turbid liquids

Pinaki Gupta-Bhaya; Anjan Kumar Ghosh; Vishal Saxena; Joseph John

doi:10.1117/12.686572

25 October 2006 Design and calibration of low-cost fiber optic sensors for refractive index measurement of turbid liquids

Pinaki Gupta-Bhaya, Anjan Kumar Ghosh, Vishal Saxena, Joseph John

Author Affiliations +

Proceedings Volume 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II; 63780V (2006) https://doi.org/10.1117/12.686572
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

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.

Citation Download Citation

Pinaki Gupta-Bhaya, Anjan Kumar Ghosh, Vishal Saxena, and Joseph John "Design and calibration of low-cost fiber optic sensors for refractive index measurement of turbid liquids", Proc. SPIE 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II, 63780V (25 October 2006); https://doi.org/10.1117/12.686572

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