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[EECS Colloquium] 11/10(Thu) 16:00, Fiber Optic Distributed Sensors and Their Smart Application, Dr.Il-Bum Kwon

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  • 등록일 : 2016.11.09
  • 조회수 : 2827

EECS Colloquium

 


Host: Byeong Ha Lee / Language: English


Thursday, November 10, 2016, 16:00-17:30


Haerim Hall, EECS-B Bldg. 1st Floor


Fiber Optic Distributed Sensors and

 

Their Smart Application


Il-Bum Kwon,  Ph.D.


Korea Research Institute for Standards and Science

 


Abstract


Fiber optic distributed sensors usually use conventional telecommunication optical fibers for sensing part. These sensors can measure strain, temperature, vibration and acoustics in distributed manner, such as the sensing fiber can be operated as many continuously connected multiple sensors through the fiber. So, these sensors are perfect to apply for structural health monitoring because these sensors can measure many continuous points on large structures, also have durability and electro-magnetic immunity. Therefore, in this presentation, three types of fiber optic distributed sensors are to be introduced and their application. At first, Raman OTDR is shown with auto-correction technic due to bending loss when temperature is the measurement parameter. Secondly, in order to measure strain, Brillouin OTDA sensor is developed and the spatial resolution can be enhanced by pulse differential technic. Finally, a phase modulated fiber optic BOCDA sensor is implemented using pseudo-random phase modulation. This sensor can detect impact damage severity and location of composite materials. Anyway, fiber optic distributed sensors are very excellent to apply for health monitoring of large structures.

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