Development and Application of Infrared Thermography in Parts′NDT

Infrared thermography is a kind of non-destructive testing technology where parts′surface temperature field distribution were obtained through the extrinsic stimulation,and the parts′damage information were extracted from thermography.It is fast,real-time detection and no contact etc.The research and application prospect are extensive.The development status and application examples of infrared thermography are reviewed,through comparing three kinds of common infrared thermography:pulse infrared thermography,ultrasonic infrared thermography and lock-in infrared thermography,demonstrating that the ultrasonic lock-in infrared thermography has incomparable advantage over other several technologies.Some specific measures to improve this method from the detection technology and signal processing are put forward.