Mr. Yu Shen Profile

Yu Shen

at Dalian Univ of Technology

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Proceedings Article | 12 November 2014 Paper

Polydimethylsiloxane-fabricated optical fiber sensor capable of measuring both large axial and shear strain

Yu Shen, Ziyuan Wang, Huaihai Wen, Zhi Zhou

Proceedings Volume 9274, 92741R (2014) https://doi.org/10.1117/12.2072619

KEYWORDS: Sensors, Fiber optics sensors, Optical fibers, Structural health monitoring, Signal processing, Lead, Multiplexing, Electromagnetic interference, Infrared lasers, Seismic sensors

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Fiber optic sensor (FOS) has received much attention in the field of Structure Health Monitoring (SHM) due to its advantages of low weight, small size, high sensitivity multiplexing ability, free of electromagnetic interference and long durability. However, in harsh environments, structures often undergo large strain where few traditional fiber optic sensors could survive. This paper report a novel material with features of light-transparent, chemically inert, thermally stable material Polydimethylsiloxane(PDMS) fabricated large axial/shearing strain sensor. The sensor was fabricated by directly coupling a conventional signal mode fiber into half cured PDMS material using a translation stage under the inspection of a microscope. Meanwhile, a laser diode and a photo detector were used in the fabrication process to make sure the sensor achieved minimum light loss. An experiment was conducted later to investigate the sensor’s transmission characteristic in 1310nm infrared laser relating with the applied axial/shearing strain. The results show that the proposed sensor survived an axial strain of 6 7.79 x 10⁶ με ; a shear of 4 6.49 x 10⁴ με with good linearity and repetition. The experiment indicates that the proposed sensor can potentially be used as strain sensing elements in Structure Health Monitoring systems under earthquake or explosion.

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