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http://dx.doi.org/10.7734/COSEIK.2019.32.6.401

Hetero-core Optical Fiber Exposure Sensor Module and Instrumentation Delay  

Song, Young-Yong (Department of Civil Engineering, Pukyong National Univ.)
Park, Eik-Tae (Department of Civil Engineering, Pukyong National Univ.)
Lee, Hwan-Woo (Department of Civil Engineering, Pukyong National Univ.)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.32, no.6, 2019 , pp. 401-408 More about this Journal
Abstract
The objective of this study is to develop a new type of buried sensor module that can directly assess pre-stressed concrete by measuring strain using a hetero-core optical fiber sensor. In this regard, experiments were conducted to evaluate the performance of the sensor using an exposure sensor module. Based on the experimental results, when the values of the displacement control velocity were 0.12 mm/min and 1.80 mm/min, the corresponding delays in the measurement were 52.1 s and 2.6 s respectively, which indicated that the maximum delay between the two measurements was a factor of 19. Due to the measurement delay phenomena, the sensor module used in the experiments cannot be employed to check the real-time state of the structure. Thus, additional experiments were needed to develop a new sensor module that can measure the real-time state of the structure. To investigate the cause of the measurement delay phenomena, three experiments were conducted. It was confirmed that measurement delay is mainly attributed to frictional resistance. The measurement delay phenomena were not observed in the experiments using the friction-removed device.
Keywords
hetero-core; optical fiber sensor; prestress; exposure sensor-module; measurement delay;
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Times Cited By KSCI : 4  (Citation Analysis)
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