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US 4,476,512 AGranted
Monitor device for laser systems transmitting laser light through optical fibers
AssigneeSumitomo Electric Industries, Ltd.
InventorsKatsuyoshi Sunago, Shinya Takenaka
Life of this patent
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Abstract
A monitor device for use in a laser system transmitting laser light through an optical fiber includes a heat-sensitive element which produces an output to monitor the laser system, the element being provided in a predetermined area of the fiber.
Claims2
A monitor device for a laser system transmitting laser light through an optical fiber, comprising:
- an optical fiber;
- heat-sensitive means for producing an output to monitor the laser system, said means being attached to the exterior of said fiber at a predetermined, localized area of the fiber, said area being a small fraction of the total area of said fiber;
- and
- an abnormality detection circuit receiving an output of said heat-sensitive element for actuating safety means, said abnormality detection circuit comprising means for detecting both an abnormal increase and an abnormal decrease in laser power, said safety means being actuated for both conditions.
1 more element
Dependencies are inferred from the claim text.