| 摘要 |
<p>A laser focus compensating sensing and imaging device (10) permits the focus of a single focal point of different frequency laser beams emanating from the same source point. In particular it allows the focusing of laser beams originating from the same laser device (14) but having differing intensities so that a low intensity beam will not convert to a higher frequency when passing through a conversion crystal (16) associated with the laser generating device (14). The laser focus compensating sensing and imaging device (10) uses a cassegrain system (28,30) to fold the lower frequency, low intensity beam back upon itself so that it will focus at the same focal point (20) as a high intensity beam. An angular tilt compensating lens (34) is mounted about the secondary mirror (30) of the cassegrain system to assist in alignment. In addition cameras or CCD'S (44) are mounted with the primary mirror (28) to sense the focused image. A convex lens is positioned co-axial with the cassegrain system on the side of the primary mirror (28)distal of the secondary for use in aligning a target (42) with the laser beam. A first alternate embodiment includes a cassegrain system using a series of shuttles and an internally mounted dichroic mirror (81). A second alternate embodiment uses two laser focus compensating sensing and imaging devices (10, 125) for aligning a moving tool (100) with a work piece (118).</p> |
