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심철무,최하림 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.6
Advances in Neutron Imaging for the 21st Century라는 주제를 가지고 제 4차 국제 중성자래디오그라피 주제별회의에서 발표된 논문을 요약 및 소개하여 최근의 중성자래디오그라피 실시간 구축을 위한 neutron detector 개발 및 image 기술에 대한 현황을 파악하고자 한다.
"Split-spectrum Processing"을 使用해서(結晶粒 크기에 따른)超音波 缺陷判讀 改善
具吉謨,沈鐵茂,安秉完 韓國非破壞檢査學會 1988 한국비파괴검사학회지 Vol.8 No.1
A split-spectrum processing technique for an ultrasonic system has been developed, which improves the flaw-to-grain echo ratio in large-grained materials. The enhancement is achieved by partitioning a wide-band received spectrum to obtain frequency shifted bands, which are then processed to suppress the grain echoes with respect to the flaw echo, using a novel signal minimization algorithm. A technique for suppression of grain echoes has also been devised which takes advantage of the fact that the grain echo amplitude changes with the frequency of the incident ultrasound whereas the flaw echo amplitude does not. The combination of this technique and the new flaw detection system greatly improve the capabilities of ultrasonic evaluation of large grain materials.