Development of a new nondestructive inspection system for casting defects in engine cylinder by pulse heating infrared thermography

摘要

A new pulse heating thermographic NDI system for the inline inspection of engine cylinder was developed, in which an insert-type xenon flash lamp and an omni-directional mirror were employed for uniform pulse heating and subsequent multi-directional temperature measurement of the inner surface of engine cylinder. Feasibility of the proposed technique was demonstrated by the several experimental investigations using test samples with artificial bottom-hole defects. It was found from these experimental studies that defects were accurately identified in the thermal images obtained by the infrared thermography using the insert-type flash lamp heater and the omni-directional mirror.