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Accessing refractive index of absorptive liquid media with optical fibre evanescent-field sensor

This paper presents an optical fibre sensor which can access the refractive index of the external liquid absorptive media. The sensor employs an evanescent-field intensity-type transparent dielectric detection element of hemispherical form. For this detection element, the effect of absorption of the external media on the measurement results was quantified. In order to reduce the measurement errors caused by finite absorption of the external media, we incorporated an absorption-sensitive optical cell in series with the detection element in the sensor. We describe the new measurement procedure that allows one to reduce the errors caused by the finite absorption of the external media.