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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Fig. 1. Schematic structure of the FFPI-FBG hybrid sensor.

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Fig. 2. Digital microscope image of the hybrid sensor.

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Fig. 3. Reflective spectrum of the hybrid sensor.

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Fig. 4. (a) Configuration and (b) actual packaging of the hybrid sensor.

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Fig. 5. Room temperature performance of the FFPI-FBG hybrid sensor.

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Fig. 6. Cryogenic experimental setup.

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Fig. 7. (a) Bragg wavelength and (b) FFPI cavity length versus the temperature at cryogenic temperatures.

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Temperature (K)	TOC of Fused Silica (Corning 7980) (Published Data)	TOC of Optical Fiber (Measured in the Study)
50	$1.98 \times 10^{- 6}$	$0.11 \times 10^{- 6}$
100	$3.36 \times 10^{- 6}$	$1.24 \times 10^{- 6}$
160	$5.02 \times 10^{- 6}$	$2.82 \times 10^{- 6}$
200	$6.12 \times 10^{- 6}$	$4.00 \times 10^{- 6}$
240	$7.22 \times 10^{- 6}$	$5.29 \times 10^{- 6}$
275	$8.19 \times 10^{- 6}$	$6.50 \times 10^{- 6}$