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Proceedings Paper

Fiber Optic Fluid Level Sensor
Author(s): Madjid A. Belkerdid; Navid Ghandeharioun; Brian Brennan
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Paper Abstract

A fiber optic fluid level sensor based on transmission attenuation due to bending loss is described. Fibers formed with reverse curvatures of decreasing radii will induce an increasing amount of lower mode light loss to the cladding as the light propagates along the multimode fiber. The sensor is arranged in the fluid in a vertical orientation such that the light travels along the fiber from the bottom or low fluid point to the top or full point. As the fluid covers increasing lengths of the exposed fiber, it strips ever more power from the cladding (assuming the fluid refractive index is greater than the cladding). Data taken with a sensor of this configuration show a monotonic decrease of output intensity as a function of increasing fluid level. As much as a -14dB change occurred over a one-foot fluid level change. Comparison of these results with a mathematical model shows good agreement.

Paper Details

Date Published: 3 January 1986
PDF: 6 pages
Proc. SPIE 0566, Fiber Optic and Laser Sensors III, (3 January 1986); doi: 10.1117/12.949781
Show Author Affiliations
Madjid A. Belkerdid, University of Central Florida (United States)
Navid Ghandeharioun, University of Central Florida (United States)
Brian Brennan, Simmonds Precision (United States)

Published in SPIE Proceedings Vol. 0566:
Fiber Optic and Laser Sensors III
Emery L. Moore; O. Glenn Ramer, Editor(s)

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