Moire interference pattern, illustration

Moire interference pattern, illustration

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Credit: K H FUNG/SCIENCE PHOTO LIBRARY

Caption: Moire interference pattern, illustration. This interference pattern is formed by superimposing two regular sets of lines on one another at certain angles. The effect can be used to test material surface regularity. A piece of glass etched with regular parallel lines is placed in front of the specimen. A shadow of this reference grating is cast onto the specimen by a beam of light projected from a 45 degree angle. Any warping of the specimen's surface will result in Moire fringes appearing due to the interference pattern between the reference and shadow grating.

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