Radiation imagery chemistry: process – composition – or product th – Visible imaging using radiation only other than heating by...
Patent
1993-03-22
1995-03-14
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Visible imaging using radiation only other than heating by...
430347, 430332, 430945, 427555, 347225, G03C 556, G01D 1514
Patent
active
053976860
ABSTRACT:
A method for temporarily marking a surface whose distance from a light beam source can substantially vary, without requiring focusing or refocusing of the light beam, commences with the step of coating a portion of the surface with a light reactant, color-forming chemical solution. The solution is soluble in a liquid solvent that is nonreactive with the surface. The coated portion of the surface is exposed to a collimated, non-focused laser beam exhibiting an airy disk pattern having central bright spot, the exposure occurring for a period of time that enables the central bright spot to expose the coating and to manifest a color change at points of incidence. The bright spot exhibits a diameter that does not exceed a predetermined diameter within an expected distance variations between the source of the laser beam and the surface. A laser source employs a gradient index lens to produce the airy disk diffraction pattern with a central bright spot that manifests more than 50% of the energy of a collimated beam emanating from the laser source.
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Dominick Glenn E.
Ehrgott William R.
Anderson Terry J.
Bowers Jr. Charles L.
Hoch Jr. Karl J.
McPherson John A.
Northrop Grumman Corporation
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