Nondestructive Inspection (NDI) is the inspection of a structure or component in any manner that will not impair its future usefulness. The purpose of the inspection may be to detect flaws, measure geometric characteristics, determine material structure or composition, or it may characterize physical, electrical, or thermal properties without causing any changes in the part. The seven standard NDI disciplines include:
Liquid Penetrant, Magnetic Particle, Eddy Current, Ultrasonic, Radiography, Thermography and Shearography.