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.
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