Title

Fiber Optic Fluid Level Sensor

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. © 1986 SPIE.

Publication Date

1-3-1986

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

566

Number of Pages

153-158

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.949781

Socpus ID

0343420519 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0343420519

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