Patents by Inventor Christopher Nicholas David Peters

Christopher Nicholas David Peters has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5850068
    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.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: December 15, 1998
    Assignee: Lumonics Ltd.
    Inventors: Christopher Nicholas David Peters, Julian D C Jones, Duncan Paul Hand, Francis Martin Haran