30 January 2012 Double-fiber Fabry-Perot Interferometry optical fiber liquid level sensor
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Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83510T (2012) https://doi.org/10.1117/12.915918
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia
Abstract
This paper presents a liquid level sensor with a double-fiber Fabry-Perot (F-P) cavity and a diaphragm serving as the sensing element. The end surfaces of the two fibers that integrated in a ferrule serve as the front surfaces of the F-P cavities, and the diaphragm (one of the standard components of a manometer) as the rear surface. The random difference in position between the two fiber ends makes a phase difference between the two F-P interferometers, and is used to interpret the direction of the pattern shifts with the variation of the F-P cavity length, which leads to a much lower technological requirement for the cavity manufacture and a more stable sensor. A prototype is fabricated to demonstrate the design, and the experimental results show a system accuracy of 1/2 fringe, refer to a height-resolution of 1mm.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bin Tong, Min Li, Yulin Li, "Double-fiber Fabry-Perot Interferometry optical fiber liquid level sensor", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83510T (30 January 2012); doi: 10.1117/12.915918; https://doi.org/10.1117/12.915918
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