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Self-Heated Optical Fiber Sensor Array for Cryogenic Fluid Level Sensing

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4 Author(s)
Tong Chen ; Dept. of Electr. Eng., Univ. of Pittsburgh, Pittsburgh, PA, USA ; Maklad, M. ; Swinehart, Philip R. ; Chen, K.P.

We present an array of aluminum-coated fiber Bragg gratings (FBGs) inscribed in high-attenuation fibers capable of measuring the liquid level in a cryogenic environment. The sensors are heated by the optical energy propagating in fiber core that is absorbed in high-attenuation fibers. Thermal responses of Bragg gratings to liquid nitrogen level at 77 K were observed. Precise control over the light absorption and heated FBG temperatures of individual level sensors using high-attenuation fibers enables multipoint liquid nitrogen level sensing using a single fiber and a single fiber feedthrough.

Published in:

Sensors Journal, IEEE  (Volume:11 ,  Issue: 4 )