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公开(公告)号:US20140347660A1
公开(公告)日:2014-11-27
申请号:US14366812
申请日:2012-12-19
Applicant: Taylor Hobson Limited
Inventor: Mathieu Rayer
IPC: G01J3/02
CPC classification number: G01J3/0262 , G01B11/026 , G01B11/303 , G01B11/306 , G01B2210/50 , G02B21/0064
Abstract: Metrological apparatus and a confocal sensor for use in such apparatus are described. The confocal sensor (1) has an optical pinhole (11) adapted for letting through a light beam (2). An optical assembly of the sensor has a first lens (12) having a refractive profile (121) and a diffractive profile (122) and a second lens (13) having at least a refractive profile (131). The refractive profile (121) of the first lens (12) and the refractive profile (131) of the second lens (13) focus the light beam (2) into a focused beam (21). The diffractive profile (122) of the first lens (12) creates longitudinal chromatic aberration so that the focused beam (21) has a focal zone with a longitudinal depth (R).
Abstract translation: 描述了用于这种装置的计量装置和共聚焦传感器。 共焦传感器(1)具有适于通过光束(2)的光学针孔(11)。 传感器的光学组件具有具有折射轮廓(121)和衍射轮廓(122)的第一透镜(12)和至少具有折射轮廓(131)的第二透镜(13)。 第一透镜(12)的折射轮廓(121)和第二透镜(13)的折射轮廓(131)将光束(2)聚焦成聚焦光束(21)。 第一透镜(12)的衍射轮廓(122)产生纵向色差,使得聚焦光束(21)具有纵向深度(R)的聚焦区域。