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Title |
Development of Embedded Type Sensor Module for Measuring Stress of Concrete Using Hetero-core Optical Fiber
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Authors |
양희원(Hee-Won Yang) ; 이환우(Hwan-Woo Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.2.68 |
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Keywords |
헤테로코어; 광섬유; 프리스트레스; 센서모듈 Hetero-core; Optical fiber; Prestress; Sensor module |
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Abstract |
In this study, in order to directly evaluate the prestress of the PSC structure, a new sensor module based on the measurement of the deformation of concrete was proposed using hetero-core optical fibers and performance tests were performed. In a hetero-core optical fiber, optical loss occurs when a specific part of the transmission path is bent, and the amount of optical loss changes linearly according to the magnitude of the curvature. In order to confirm the measurement performance of the sensor module and the applicability of the optical fiber, the sensor module was deformed and the light passing through the optical fiber was converted into wattage and measured. It can be seen that the light passing through the optical fiber has a linearity of 0.9333 in relation to the deformation while generating the maximum deformation of 0.5 mm at a rate of 0.12 mm/min in a cylindrical concrete specimen with a diameter of 15 cm and a height of 35 cm in which the sensor module is embedded. Based on the results of this experiment, it is judged that it is possible to directly evaluate the prestress of a PSC structure by embedding a sensor module using a hetero-core optical fiber in the structure and measuring the compression deformation in concrete. It is judged that it can be used as useful data for the development of a sheath tube integrated sensor module to be applied to be applied to the girder model experiment.
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