Laser Speckle Photometry 

LSPLaser Speckle Photometry is an optical non-destructive technique for monitoring material characteristics including hardness, porosity, defects and stresses. The technique was developed at the Fraunhofer IKTS in Germany.

Speckle patterns are produced when laser (coherent) light illuminates a diffuse surface and the reflected light produces a random interference known as a speckle. Movement of the surface will cause fluctuations in the intensity of the speckle pattern. Such movement can be generated mechanically or thermally and the changes produced in the speckle pattern can be correlated with the characteristics of the test object.

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