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Proceedings Paper

Simultaneous measurement of temperature and strain based on composite long-period fiber grating
Author(s): Chengguo Tong; Qihao Hu; Jiang He; XuDong Chen; Tao Geng; Zhanjing Bao; Zixuan Li; Wenlei Yang; Weimin Sun
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Paper Abstract

Long period fiber grating is a kind of transmission type optical fiber grating. Due to the advantages such as low insertion loss, wide bandwidth, low-level reflection, high sensitivity, low cost and ease of compactness, LPFGs have been widely applied in optical fiber sensing and optical fiber communication. The Mode coupling of LPFG is the coupling between the fiber core mode and the cladding mode in the same transmission direction. If the ordinary LPFG is combined with bitaper or taper, we can effectively change the original LPFG's transmission spectrum to obtain the composite LPFG, which can stimulate new resonant peaks in the original wavelength-dependent transmission loss of the grating basis, thus applying to the dual-parameter simultaneously measuring field. We report a novel all-fiber narrow-bandwidth intermodal Mach– Zehnder interferometer (MZI) based on a long-period fiber grating (LPFG) combined with a fiber bitaper. The LPFG is written by high-frequency CO2 laser pulses, and the bitaper is connected in series with the LPFG, forming the Mach– Zehnder interferometer (MZI). Experimental results indicate that the MZI has good temperature sensitivity, The temperature sensitivity of the two loss peaks are 55.35pm/°C and 48.18pm/°C respectively. The strain sensitivity of the two loss peaks are 3.35pm/με and -4.925pm/με respectively. By using the different temperature and strain response characteristics of the loss peaks, the temperature and strain measurement can be realized simultaneously. the proposed device has good repeatability and stability, which would be a promising candidate for precise dual-parameter sensing application.

Paper Details

Date Published: 14 November 2016
PDF: 8 pages
Proc. SPIE 10025, Advanced Sensor Systems and Applications VII, 1002503 (14 November 2016); doi: 10.1117/12.2246917
Show Author Affiliations
Chengguo Tong, Harbin Engineering Univ. (China)
Qihao Hu, Harbin Engineering Univ. (China)
Jiang He, Harbin Engineering Univ. (China)
XuDong Chen, Harbin Engineering Univ. (China)
Tao Geng, Harbin Engineering Univ. (China)
Zhanjing Bao, Harbin Engineering Univ. (China)
Zixuan Li, Harbin Engineering Univ. (China)
Wenlei Yang, Harbin Engineering Univ. (China)
Weimin Sun, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 10025:
Advanced Sensor Systems and Applications VII
Tiegen Liu; Shibin Jiang; Rene Landgraf, Editor(s)

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