Electro-optic aids to quality assessment (EAQA) and structural validation

Electro-optic aids to quality assessment (EAQA) utilize very sensitive full field non-contact, finger printing methods, to visualize discontinuities nd quantify movement and strain in most materials and structures between low nd elevated temperatures. These methods are laser holography, laser speckle photography and infra-red thermoelasticity. The laser techniques involve recording double exposures of objects illuminated with coherent light and the infra-red technique records infra-red radiation emitted from a structure undergoing cyclic loading. The techniques are described