coded mask

coded mask

[′kōd·əd ‚mask]
(engineering)
A pattern of tungsten blocks that absorb gamma-ray photons in a gamma-ray telescope, and are arranged so that an astronomical gamma-ray source projects on a position-sensitive detector a pattern that is characteristic of the direction of arrival of the photons.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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However, although the part model is fixed for a given inspection task, the coded mask may change for different parts of the same class.
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They squabble, eat pizza, say "Cowabunga!" and wear colour coded masks.
Mutant ninja turkey; Out of the sewers.. this cack-handed revival is a stinker

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