Abstract
The results of earlier experiments suggest that a linear relationship exists between the optical signal passing through liquids in the refractive index range 1.3 to 1.6 when the liquid couples two multi-mode optical fibre cables, An analogue transmission system has been constructed, with a solid state camera and a computer as the basis of the detector system, in order to examine in detail the emission from the receiver optical fibre cable. The measurements obtained and the empirical equations deduced from them, suggest the possibility of an intrinsically safe technique for monitoring the refractive index of liquids that are non-absorbent in the red region of the optical spectrum.
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