Electric heating – Metal heating – By arc
Patent
1997-06-03
1998-12-15
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912173, B23K 2604
Patent
active
058500685
ABSTRACT:
When a laser beam interacts with a workpiece to be welded by the beam, a plume of optical radiation is generated. An apparatus and method is disclosed in which radiation from the plume is received back through a beam delivery path comprising optical elements (L1,L2) having chromatic aberration. This alters the focus of different spectral bands of the plume radiation and a discriminating aperture is formed by a face of an optical fibre (3). After passing through the fibre, the plume radiation is separated from any laser radiation and the respective powers of the different spectral bands are measured (5). By subtraction, an error signal is obtained which is used to control the focus of the laser beam.
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Browne, Mark A. et al. "Stage-Scanned Chromatically Aberrant Confocal Microscope for 3-D Surface Imaging" Proc SPIE Int Soc Opt, Eng; Proceedings of SPIE-The International Society of Optical Engineering, vol. 1660, No. Part 2, 10-13 Feb. 1992, pp. 532-541.
Hand Duncan Paul
Haran Francis Martin
Jones Julian D C
Peters Christopher Nicholas David
Evans Geoffrey S.
Lumonics Ltd.
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