The Measurements of Metallic Structure Fatigue and Composite Patch Repair Using Power Modulated Fiber Grating Sensors
Date Issued
2014
Date
2014
Author(s)
Lin, Fan-Chun
Abstract
Daily life of many mechanical components such as aircraft, bridges, trains, elevators, etc., in the long-term use due to fatigue cracks in the structure when the crack grows to a critical value, should be designed monitoring means providing a mechanism for the occurrence and the fatigue strength in the reinforcing patch.
Currently FBG sensor measurement techniques have been developed for a period of time. Due to the fiber optic sensing system has a diameter of fine lightweight, high sensitivity, long-term stability, immune to electromagnetic noise interference and phase and polymer materials higher capacitive characteristics. It can be buried in the complex material. FBG is widely used in the recent strain sensing. The use of energy modulation fiber grating sensor technology used for experiments on the impact or micro-strain.
In this study design of a high sensitivity energy modulation type fiber grating sensors for measuring metal fatigue and structural composite repair patch. Propose a method for static tensile test modulation voltage and strain quantized. Success used energy modulation type fiber grating sensors measure the mechanical properties of steel wire, the standard compact type specimen’s opening displacement and buried fiber grating to monitor crack growth in composite materials. Finally confirmed the accuracy of the sensor is higher than the experimental optical spectrum analyzer.
Subjects
疲勞測試
金屬裂縫生長監測
複合材料貼片修補
非破壞性檢測
能量調變型光纖光柵感測器
Type
thesis
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ntu-103-R01522532-1.pdf
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