Holographic Nondestructive Testing

摘要

Holographic nondestructive testing (HNDT) is a high sensitivity, full field, noncontact, optical technique for observing the changes in the surface of a part as it deforms under stress. The stress can arise from the minute application of heat, pressure, torque, or vibration. The information obtained can be used as a design aid to locate and quantify areas undergoing strain and as a quality control aid to identify structural flaws such as internal flaws or delaminations. HNDT is also used to identify and measure vibrational modes.