Elimination of reflection induced artifacts in flash thermography

摘要

Pulsed thermography is a technique in which pulsed flash energy is applied to the surface and the temperature of the surface is recorded and analysed. Generally the temperature above the defect areas is different from that of the surrounding area. However, when the surface of the specimen is highly reflective, artifact of fixed pattern could be introduced which comes from the reflection of the heated lamp tube. Several methods were used to eliminate the artifact, including spatial filtering, image subtraction and frequency domain filtering. Results show that spatial filtering may be the best method of the fixed pattern artifact elimination.