Apparatus for, and Method of, Recording and Viewing Laser-made Images on High Gain Retroreflective sheeting.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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This patent discloses from a laser light beam a preselected pattern, that is transparent andor opaque, on a target made of high gain retroreflective sheeting of the exposed-lens type, with the target inclined at a previously chosen angle and, thereafter, viewing the recorded image of the pattern which is recorded on the target by structural alteration, i.e., modification, of the target material that is caused by the laser light beam radiation, solely with the naked eye and in ambient light. The recorded image can be seen only when the target is inclined at the same angle at which the target was positioned when the pattern was recorded by the laser beam radiation on the target. Author
- Lasers and Masers