Nondestructive evaluation ofpolymer materials,
- G. Busse
- NDT &E Int'l,
Recently, a novel approach was proposed which combines advantages of both pulse (PT) and modulated (MT) infrared thermography. In a nondestructive evaluation (NDE) perspective, the specimen is pulse-heated as in PT and the rnix offrequencies ofthe thermal waves launched into the specimen are unscrambled by perforrning the Fourier transform of the temperature time evolution over the field of view. Of interest is the maximum phase image with many attractive features: deeper probing, less infiuence to surface infrared and optical characteristics, rapid image recording (pulse heating, surface-wide inspection), possibility to inspect high thermal conductivity specimens. The proof-of-concept of this new approach called pulse phase infrared thermography (PPT) was demonstrated earlier .