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http://dx.doi.org/10.3795/KSME-A.2017.41.4.313

Effects of Cyclic Thermal Load on the Signal Characteristics of FBG Sensors Packaged with Epoxy Adhesives  

Kim, Heonyoung (Advanced Materials Research Team, Korea Railroad Research Institute)
Kang, Donghoon (Advanced Materials Research Team, Korea Railroad Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.4, 2017 , pp. 313-319 More about this Journal
Abstract
Fiber optics sensors that have been mainly applied to aerospace areas are now finding applicability in other areas, such as transportation, including railways. Among the sensors, the fiber Bragg grating (FBG) sensors have led to a steep increase due to their properties of absolute measurement and multiplexing capability. Generally, the FBG sensors adhere to structures and sensing modules using adhesives such as an epoxy. However, the measurement errors that occurred when the FBG sensors were used in a long-term application, where they were exposed to environmental thermal load, required calibration. For this reason, the thermal curing of adhesives needs to be investigated to enhance the reliability of the FBG sensor system. This can be done at room temperature through cyclic thermal load tests using four types of specimens. From the test results, it is confirmed that residual compressive strain occurs to the FBG sensors due to an initial cyclic thermal load. In conclusion, signals of the FBG sensors need to be stabilized for applying them to a long-term SHM.
Keywords
Fiber Bragg Grating; Signal Characteristics; Fiber Optic Sensor; Cyclic Thermal Load; Adhesives;
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Times Cited By KSCI : 5  (Citation Analysis)
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