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Cryogenic fluid level sensors multiplexed by frequency-shifted interferometry

Ye, F and Chen, T and Xu, D and Chen, KP and Qi, B and Qian, L (2010) Cryogenic fluid level sensors multiplexed by frequency-shifted interferometry. Applied Optics, 49 (26). 4898 - 4905. ISSN 1559-128X

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We present a liquid level sensing system for cryogenic fluids based on an array of aluminum-coated fiber Bragg gratings written in high-attenuation fibers (HAFs) interrogated by frequency-shifted interferometry (FSI). The sensors are heated up optically through the absorption of light at the core of the HAF sections. The distinct thermal response of sensors in the liquid from that in the gas provides an unambiguous means to detect the liquid level. FSI allows the sensors to have overlapped spectral response, and, therefore, has the potential of accommodating a larger number of sensors in the array. The measurement of liquid nitrogen level using this system was experimentally demonstrated. The successful combination of aluminum-coated HAF Bragg grating sensors and the FSI technique promises a viable solution for liquid level sensor networks at cryogenic temperatures. © 2010 Optical Society of America.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Ye, F
Chen, T
Xu, D
Chen, KPpec9@pitt.eduPEC90000-0002-4830-0817
Qi, B
Qian, L
Date: 10 September 2010
Date Type: Publication
Journal or Publication Title: Applied Optics
Volume: 49
Number: 26
Page Range: 4898 - 4905
DOI or Unique Handle: 10.1364/ao.49.004898
Schools and Programs: Swanson School of Engineering > Electrical and Computer Engineering
Refereed: Yes
ISSN: 1559-128X
PubMed ID: 20830178
Date Deposited: 21 Oct 2014 16:44
Last Modified: 15 Jan 2021 15:55


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