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Optical Engineering

Fabrication and characterization of metal-packaged fiber Bragg grating sensor by one-step ultrasonic welding
Author(s): Yumin Zhang; Lianqing Zhu; Fei Luo; Mingli Dong; Xiangdong Ding; Wei He
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Paper Abstract

A metallic packaging technique of fiber Bragg grating (FBG) sensors is developed for measurement of strain and temperature, and it can be simply achieved via one-step ultrasonic welding. The average strain transfer rate of the metal-packaged sensor is theoretically evaluated by a proposed model aiming at surface-bonded metallic packaging FBG. According to analytical results, the metallic packaging shows higher average strain transfer rate compared with traditional adhesive packaging under the same packaging conditions. Strain tests are performed on an elaborate uniform strength beam for both tensile and compressive strains; strain sensitivities of approximately 1.16 and 1.30  pm/μϵ are obtained for the tensile and compressive situations, respectively. Temperature rising and cooling tests are also executed from 50°C to 200°C, and the sensitivity of temperature is 36.59  pm/°C. All the measurements of strain and temperature exhibit good linearity and stability. These results demonstrate that the metal-packaged sensors can be successfully fabricated by one-step welding technique and provide great promise for long-term and high-precision structural health monitoring.

Paper Details

Date Published: 7 June 2016
PDF: 7 pages
Opt. Eng. 55(6) 067103 doi: 10.1117/1.OE.55.6.067103
Published in: Optical Engineering Volume 55, Issue 6
Show Author Affiliations
Yumin Zhang, Beijing Information Science & Technology Univ. (China)
Lianqing Zhu, Beijing Information Science & Technology Univ. (China)
Fei Luo, Beijing Information Science & Technology Univ. (China)
Mingli Dong, Beijing Information Science & Technology Univ. (China)
Xiangdong Ding, Beijing Information Science & Technology Univ. (China)
Wei He, Beijing Information Science & Technology Univ. (China)

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