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Title |
Temperature Effect Compensation Method Based on BOCDA and Inner Product
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Authors |
유용래(Yong-Rae Yu) ; 유훈(Hoon Yu) ; 안호준(Ho-June Ann) ; 이종재(Jong-Jae Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.6.104 |
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Keywords |
BOCDA; 변형률 기반 손상 탐지; 구조물 건전성 평가; Basis Vector; 온도 영향 제거 BOCDA; Strain-based damage detection; Structural health monitoring; Basis vector; Temperature effect compensation |
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Abstract |
In structural health monitoring, various sensors are used to measure physical quantities and assess the condition of structures. Among these, strain measurement enables both global and local assessment. However, conventional electrical resistance strain gauges perform point measurements, which makes it challenging to evaluate the global condition of a structure. To overcome this limitation, distributed fiber optic sensors have been investigated. However, structural conditions are influenced not only by loads but also by environmental factors such as temperature and humidity.
Therefore, to achieve accurate condition assessment, it is necessary to compensate for the effects of temperature. In this study, a method to compensate for temperature effects is proposed using strain data obtained from a BOCDA-based distributed fiber optic sensor. The proposed method is based on the theory that strain caused by temperature and strain caused by load (or damage) are independent. The method eliminates the temperature effect by calculating strain data at a temperature similar to the measured temperature using a basis vector and applying an inner product technique. To validate the proposed method, indoor experiments were conducted using an aluminum specimen and a temperature chamber. The results demonstrated that dynamically updating the compensation values based on the measurement environment allowed for the accurate identification of values and locations similar to the applied load.
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