Nondestructive crack detection in pressure vessels and reactor components by optical holography

A new test method for nondestructive testing of materials is introduced. This method renders possible the detection of material faults by the aid of holographic interferometry. This technique, which is still being developed, makes use of the disturbance of surface deformations at cracks and other faults near the surface after an adequate load of the structural part. This method shall be utilized for repeating tests and comparison measurings at structural parts operating under pressure