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이은주 ( Lee Eun-joo ),박동녘 ( Park Dong-nyuck ),전흥재 ( Chun Heoung-jae ),임홍철 ( Rhim Hong-chul ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
Fiber optic Bragg grating sensors hold a great deal of potential for structural monitoring because of their exceptional stability and demonstrated potential for long term monitoring. So, smart structure that contains FBG sensors, which are either embedded in a material or attached to a structure, is receiving considerable attention. A good sensitivity and small size of this sensor make it an ideal candidate for distributed sensing in smart structures or other structural monitoring application. Hence, FBG sensor is suitable to be embedded in or attached on structures for internal/surface strain and temperature measurements. In this paper, according to the various temperatures the thermal behavior of unidirectional composite material was monitored by embedded FBG sensors in the longitudinal and transverse directions of unidirectional composites. For the purpose of demonstrating the validity of the experiment with using embedded FBG sensor, the thermal strains measured by strain gages are compared with those obtained from the FBG sensor.
광섬유 격자 센서를 이용한 모르타르시편의 온도구배 및 열 변형 측정
임홍철 ( Rhim Hong-chul ),이은주 ( Lee Eun-joo ),전흥재 ( Chun Heung-jae ),박동녘 ( Park Dong-nyuck ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.3
FBG sensor의 다중 측정성을 이용하여 모르타르 시편의 열 변형률과 온도 변화를 동시에 측정하였다. 또한, 광섬유 격자 센서를 이용하여, 열 변화에 따른 모르타르 시편의 내부 온도 구배를 측정하였다. 열 변형률을 기존 strain gauge와 함께 측정하였을 때, strain gauge는 섭씨 60도 이상의 온도에서 오차를 보이는 반면, FBG 센서는 안정된 측정값을 나타냈다. FBG 온도 sensor로 측정한 온도 변화량은 thermocouple로 측정한 값과 비교하였으며, 선형적인 대응관계를 보였다. As concrete structures are heated, thermal strain can be developed. Because of the boundary conditions, the thermal stress may be arisen. Thermal strain and temperature were measured simultaneously using an optical fiber sensor. Fiber Bragg Grating Sensor(FBG sensor) was used in the measurement. Because it can measure the strains more than two points with one line, it was possible to measure both thermal strain and temperature with one line. To compare data measured by FBG sensor, strain and temperature were measured using strain gauge and thermocouple. The FBG sensor could measure the strain under the temperature greater than 60°C but strain gauge couldn’t. Both the FBG temperature sensor and thermocouple could measure the temperature and the results are related each other linearly.