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, Steve Chen, Chengning Yang, Chengning Yang, Christian Uremovic, Christian Uremovic, James S. Sirkis, James S. Sirkis, Alex A. Kazemi, 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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