NONDESTRUCTIVE INFRARED THERMOGRAPHY SYSTEM AND INSPECTION METHOD USING THERMAL EXPANSION

摘要

The present invention relates to an infrared thermographic non-destructive inspection system and a method using vibrating ultrasonic waves and, more specifically, relates to the infrared thermographic non-destructive inspection system and the method which confirms an existence and a location of a minute crack by narrowing the minute crack in a specimen by fixating and heating both ends of the specimen. To achieve this purpose of the present invention, the infrared thermographic non-destructive inspection system to detect the minute crack included in the specimen comprises: a fixing unit fixating both ends of the specimen; a heating unit heating the fixated specimen to narrow a gap of the minute crack by thermal expansion of the specimen; a vibrating ultrasonic wave vibration unit applying a vibrating ultrasonic wave to the specimen such that friction heat is generated in a first minute crack wherein the gap of the minute crack is reduced in order for the first minute crack to be at a higher temperature than a peripheral area of the minute crack; an infrared thermographic camera photographing the temperature on a surface of the specimen to which the vibrating ultrasonic waves are applied as an image of an infrared wavelength shape; and a control unit analyzing distribution of the temperature on the surface of the specimen in the photographed image, and determining an existence of the minute crack based on evenness of the analyzed distribution of the temperature. When the control unit determines that the distribution of the surface temperature is uneven, an area at the highest temperature in the area where the temperature distribution on the surface of the specimen is uneven is determined as the position of the minute crack.