31 May 1999 Liquid-level detection in a cryogenic environment
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steve Chen, Chengning Yang, Christian Uremovic, James S. Sirkis, Alex A. Kazemi, "Liquid-level detection in a cryogenic environment", 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; https://doi.org/10.1117/12.349768

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