Abstract
A plastic optical fiber sensor that permits a simultaneous measure of liquid level and refractive index has been developed. The device has been realized with a fiber pair of two standard plastic optical fiber, which represent the probe of the proposed sensor. One of the fibers transmits the light towards the liquid under test through a lens. The reflected light is collected by the second fiber to a photodiode, whose output is amplified and sent to a processing electronic circuit. Different liquids have been considered for the measurements. A maximum distance of about 130 cm has been obtained. Moreover, for a fixed distance value, the highest output voltage has been reached with the liquid under test characterized by the highest refractive index value. In order to understand this behaviour, measurements have been performed by adding different quantities of sugar in the water, thus changing its refractive index.
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