Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-03-24
1994-06-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
21912162, H01J 516
Patent
active
053191951
ABSTRACT:
A laser system comprises a laser (500) whose output beam is delivered to a workpiece (504) by an optical fiber (502). A transducer (506) detects the power of light propagating in the cladding layer of fiber (502) at a position near its input end. The transducer (506) also strips out the light travelling in the cladding layer. The output of transducer (506) is divided by the output of a transducer (507), which detects the power of the output beam of laser (500), to produce a signal indicative of misalignment between the laser beam and the core of fiber (502) at the input face. A transducer (505) comprises a second fiber (508) optically coupled with the cladding layer of fiber (502). Light emitted from the ends of fiber (508) is detected by a pair of detectors (509, 510), whose outputs are indicated on displays (512, 514). Display (512) provides information on the integrity of transmissions of the laser beam through fiber (502). Display ( 514) provides information on the material processing operation performed on workpiece (504), and also on the focus of the beam onto the workpiece.
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Abstract of DE-4032967-A1, Apr. 1991.
Fujise et al., "Core Alignments by a Simple Local Monitoring Method" Aug. 1984 vol. 23, No. 15/ Applied Optics pp. 2643-2648.
Boechat Alvaro A. P.
Ireland Clive L. M.
Jones Julian D. C.
Su Daoning
Le Que T.
Lumonics Ltd.
Nelms David C.
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