Focus control of lasers in material processing operations
    1.
    发明授权
    Focus control of lasers in material processing operations 失效
    激光在物料加工操作中的聚焦控制

    公开(公告)号:US5850068A

    公开(公告)日:1998-12-15

    申请号:US867813

    申请日:1997-06-03

    CPC分类号: B23K26/046

    摘要: 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.

    摘要翻译: 当激光束与待焊接的工件相互作用时,产生一束光辐射。 公开了一种装置和方法,其中来自羽流的辐射通过包括具有色差的光学元件(L1,L2)的光束传递路径被接收回来。 这改变了羽流辐射的不同谱带的焦点,并且由光纤(3)的面形成鉴别孔。 通过光纤后,羽流辐射与任何激光辐射分离,并测量不同光谱带的相应功率(5)。 通过减法,获得用于控制激光束焦点的误差信号。