Development of high speed railway inspection system using optical NDT technologies

초록

For safe railway operation, NDT technologies for various defects of infrastructures as rail, wire and signal structures are spotlighted for over a century. Recently, as high speed railway system is becoming major operating system, more accurate, faster and digitized NDE system has been required. In this paper, we overview type of rail defects with applicable NDT technologies such as ultrasound, thermography, EMAT, Radiography and optical technology. To develop high speed inspection car with working speed of 300 km/h, we focused on optical inspection system such as high speed camera and laser scanning technology. Rail surface detection is achieved with high speed line camera and high speed laser 3D profiler. Laser scanning system integrated with IMU sensor is used to measure rail derailment, twist, and gauge etc. Using these optical NDT technologies, high speed rail inspection would be achieved. Also Big Data DB of inspection data along with precise train position would be used to estimate rail life cycle for cost effective rail maintenance.