ESPI를 이용한 노즐과 동체이음 용접부의 내부결함 측정에 관한 연구

Recently the necessity of study on optical measuring method using laser to detect the pipeline's defect in nuclear facilities, chemical industries and power plants has been increased. Because laser light can be delivered to a remote area without any difficulties, the application of laser in many industries can solve several difficulties from the limitation of access in danger area and reduce the risks of workers. Therefore, we applied a new experimental technique to the measurement of internal defects in weld zone with the combination of ESPI and image processing technique and detected the internal cracks of weld zone in the former paper.