FFPI-FBG hybrid sensor to measure the thermal expansion and thermo-optical coefficient of a silica-based fiber at cryogenic temperatures

Litong Li; Dongsheng Zhang; Xiaoyan Wen; Sisi Peng

doi:10.3788/COL201513.100601

Journals >Chinese Optics Letters >Volume 13 >Issue 10 >Page 100601 > Article

Chinese Optics Letters
Vol. 13, Issue 10, 100601 (2015)

FFPI-FBG hybrid sensor to measure the thermal expansion and thermo-optical coefficient of a silica-based fiber at cryogenic temperatures

Litong Li^1、2、*, Dongsheng Zhang¹, Xiaoyan Wen³, and Sisi Peng⁴

Author Affiliations

¹National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China

²Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China

³School of Science, Wuhan University of Technology, Wuhan 430070, China

⁴Wuhan Institute of Marine Electric Propulsion, CSIC, Wuhan 430070, China

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DOI: 10.3788/COL201513.100601 Cite this Article Set citation alerts

Litong Li, Dongsheng Zhang, Xiaoyan Wen, Sisi Peng. FFPI-FBG hybrid sensor to measure the thermal expansion and thermo-optical coefficient of a silica-based fiber at cryogenic temperatures[J]. Chinese Optics Letters, 2015, 13(10): 100601 Copy Citation Text

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Abstract

In this Letter, a sensor consisting of a fiber Bragg grating (FBG) and a fiber Fabry–Perot interferometer (FFPI) sensor is developed to measure the coefficient of thermal expansion (CTE) and the thermo-optical coefficient (TOC) of a silica-based optical fiber at cryogenic temperatures. The FFPI is fabricated by welding together two acid-etched fibers. The temperature performance of the FFPI-FBG hybrid sensor is studied in the temperature range of 30–273 K. The CTE and TOC of the optical fiber at cryogenic temperatures are derived analytically and verified by experiments.

\frac{Δ λ_{B}}{λ_{B}} = (ξ + α) \times Δ T,

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