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Liquid level gauge based in plastic optical fiber

Antunes, P. ; Dias, J. M. S. ; Paixão, T. Paixão ; Mesquita, E. Mesquita ; Varum, H ; André, P.S

Measurement: Journal of the International Measurement Confederation Vol. 66, Nº -, pp. 238 - 243, April, 2015.

ISSN (print): 0263-2241
ISSN (online): 0263-2241

Journal Impact Factor: 0,662 (in 2008)

Digital Object Identifier: 10.1016/j.measurement.2015.01.030

This work reports de development and testing of a low cost plastic optical fiber liquid level sensor for operation within highly flammable or other hazardous environments, such in oil piping or fuel tanks. The sensor consists on a vertical fiber, with engraved grooves, that will be sequentially fulfill when the liquid rises, resulting in an increase of the transmitted optical power. A variation of 2.60% in the transmitted optical power intensity was obtained per measured point. Moreover, the sensor sensitivity and resolution can be tailored accordingly to the application.