speckle pattern

noun Astronomy.
the visual appearance of a star as viewed through a large telescope, with irregularities caused by the distorting effect of local turbulence in the earth's atmosphere.


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Example sentences
One-dimensional electronic correlation of speckle pattern movement allows a
  quasi-real time measure of strain.
When the reference apertures are somewhat larger, the speckle pattern is
  inverted using iterative techniques.
The speckle pattern that is observed when laser light falls on an optically
  rough surface is also a diffraction phenomenon.
In image correlation, a random speckle pattern is painted on to the specimen.
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