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US 4,544,839 AGranted
Laser beam monitoring system
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsBradley S. Weil, Grady R. Wetherington, Jr.
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Abstract
Laser beam monitoring systems include laser-transparent plates set at an angle to the laser beam passing therethrough and light sensor for detecting light reflected from an object on which the laser beam impinges.
Claims5
A system for monitoring a laser beam, comprising:
- a laser cell directing a laser beam along a first path;
- a mirror positioned to intercept said laser beam traveling along said first path and deflect it toward an object;
- a laser-transparent plate positioned on said first path between said laser cell and said mirror so that said laser beam passes therethrough, said plate being inclined relative to said first path, light which travels from said object to said mirror and thence along said first path being deflected from said plate along a second path diverging from said first path;
- a light-responsive sensor for sensing said light traveling along said second path and generating an output signal when said light is cut off;
- and
- means responsive to said output signal for terminating the operation of said laser cell.
3 more elements
Dependencies are inferred from the claim text.