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scintillation |
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scintillation [‚sint·əl′ā·shən] (electromagnetism) A rapid apparent displacement of a target indication from its mean position on a radar display; one cause is shifting of the effective reflection point on the target. Also known as target glint; target scintillation; wander. Random fluctuation, in radio propagation, of the received field about its mean value, the deviations usually being relatively small. (lapidary) The flashing, twinkling, or sparkling of light, or the alternating display of reflections, from the polished facets of a gemstone. (nucleonics) A flash of light produced in a phosphor by an ionizing particle or photon. (optics) Rapid changes of brightness of stars or other distant, celestial objects caused by variations in the density of the air through which the light passes. Rapid changes in the values of irradiance over the cross section of a laser beam. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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It is sad that I can remember nothing of all this scintillation. From a natural cause, these constellations shone with a soft luster; they did not twinkle, for there was no atmosphere which, by the intervention of its layers unequally dense and of different degrees of humidity, produces this scintillation. The few hundreds of years of Genoese and Venetian might and splendor were, to grave old Damascus, only a trifling scintillation hardly worth remembering. |
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