Method and backer for laser hole drilling

Details Method and backer for laser hole drilling Method and backer for laser hole drilling

B - Operations, Transporting

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B23K 26/00 (2006.01) B23K 26/03 (2006.01) B23K 26/18 (2006.01) B23K 26/38 (2006.01)

Patent

CA 1138936

METHOD AND BACKER FOR LASER HOLE DRILLING ABSTRACT OF THE DISCLOSURE A method and apparatus for controlling radiation beam hole drilling, especially laser hole drilling, in which radiation passing through a drilled hole is detected and utilized to controllably terminate the hole-drilling beam action. When a backer is used on the workpiece exit surface to improve hole configuration and resist penetra- tion of the beam, the backer transmits impinged radiation from the hole location to a detector coupled to a con- troller. In a preferred embodiment, a pulsed drilling laser beam is used with a continuous coaxial indicator laser beam; an epoxy resin backer adhered to the work- piece exit surface transmits indicator beam radiation to a fiber optic receptor that guides the radiation to a photomultiplier which is coupled to a controller of the drilling laser.

342343

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