Design and experiment of a fiber Bragg grating strain sensing element in high temperature environment

Hongmei Yan; Yueming Liu; Liang Zhang; Tianwen Gu

doi:10.1117/1.OE.56.7.076104

19 July 2017 Design and experiment of a fiber Bragg grating strain sensing element in high temperature environment

Hongmei Yan, Yueming Liu, Liang Zhang, Tianwen Gu

Author Affiliations +

Funded by: Key Program for Science and Technology Development of Zhejiang Province, Natural Science Foundation of Zhejiang Province of China, Natural Science Foundation of Zhejiang Province

Optical Engineering, Vol. 56, Issue 7, 076104 (July 2017). https://doi.org/10.1117/1.OE.56.7.076104

Abstract

A strain sensing element in a high temperature environment is presented and experimentally demonstrated. The proposed strain sensing element consists of polyimide-coated fiber Bragg grating (FBG) and double rhombus metal structure. The polyimide-coated FBG was fabricated on the double rhombus metal structure by a modulated low softening glass process. The double rhombus metal structure was made of high temperature constant modulus alloy. The sensitivity of the strain sensing element is enhanced by two times of strain amplification and could be adjusted by selecting the angle and the dimension of the double rhombus metal structure appropriately. It is experimentally demonstrated that the proposed strain sensing element could be used at the high temperature of 300°C, and the average wavelength sensitivity of the strain sensing element at 300°C is 3.049 and 3.259 pm/μϵ for the compressed and stretched states, respectively.

Citation Download Citation

Hongmei Yan, Yueming Liu, Liang Zhang, and Tianwen Gu "Design and experiment of a fiber Bragg grating strain sensing element in high temperature environment," Optical Engineering 56(7), 076104 (19 July 2017). https://doi.org/10.1117/1.OE.56.7.076104

Received: 27 April 2017; Accepted: 29 June 2017; Published: 19 July 2017

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KEYWORDS

Fiber Bragg gratings

Metals

Environmental sensing

Glasses

Optical design

Modulation

Temperature metrology

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