Additive/subtractive decorrelated electronic speckle pattern interferometry

摘要: A hybrid additive-subtractive decorrelated electronic speckle pattern interferometry (ESPI) scheme using a continuous reference updating technique is presented. Unlike conventional ESPI techniques, this method uses phase decorrelation between successively subtracted additive correlated images, each of which contains information about the same two states deformation test object undergoing vibrational stressing. It shown that susceptibility to environmental noise caused by building vibrations or air currents significantly lower than subtractive methods, and fringe visibility contrast are improved over techniques. The ability work in turbulent environment demonstrated, application detection defects adhesively bonded structures, problem interest nondestructive evaluation (NDE) community, shown.