Nondestructive testing of arc- and flame-sprayed coatings by holographic thermal stressing

摘要

The feasibility of using holographic interferometry for the nondestructive testing of arc and flame sprayed coatings is studied by using thermal stressing technique. The detection of bonding flaws in several specimens has been demonstrated. The location and shape of flaws detected are closely related to the artificial defects. By employing fringe control technique, the thermal stressing method can be more effective for flaw detection. With thermalplastic recording and vision system, the size and location of flaw can be visualized and evaluated in a few minutes.