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Proceedings Paper

Liquid-level detection in a cryogenic environment
Author(s): Steve Chen; Chengning Yang; Christian Uremovic; James S. Sirkis; Alex A. Kazemi
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Paper Abstract

This paper reports a preliminary experimental investigation and characterization of an optical fiber based liquid level detection system for applications in cryogenic environment. The sensor system comprises a multiplexed array of point liquid probes. Two different designs of the probe were fabricated and tested. Probe tests were conducted in different liquid/vapor interfaces including water/air, liquid/gas nitrogen and liquid/gas hydrogen. Key performances of the liquid probe, such as vapor-liquid signal ratio, response speed were measured and compared experimentally. In addition, the multiplexing of multiple liquid probes using an OTDR device was successfully demonstrated. Finally, a novel liquid probe made by direct polishing the fiber tip is proposed, which may provide further miniaturization and performance improvements.

Paper Details

Date Published: 31 May 1999
PDF: 10 pages
Proc. SPIE 3670, Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (31 May 1999); doi: 10.1117/12.349768
Show Author Affiliations
Steve Chen, Univ. of Maryland/College Park (United States)
Chengning Yang, Univ. of Maryland/College Park (United States)
Christian Uremovic, Univ. of Maryland/College Park (United States)
James S. Sirkis, Univ. of Maryland/College Park (United States)
Alex A. Kazemi, Boeing Space & Defense Group (United States)


Published in SPIE Proceedings Vol. 3670:
Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman Jr., Editor(s)

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