| 摘要 |
The invention relates to a laser tracker (12) for continuously pursuing a reflective target and for determining the position of the target, comprising a base (40) which defines a vertical axis (41), a beam guiding unit for emitting a measurement beam, the beam guiding unit being pivotable by motor relative to the base (40) about the vertical axis (41) and an inclination axis (31), and a measurement axis (57) being defined by an emission direction of the measurement beam. The invention further comprises a precision distance measurement unit for precisely determining the distance to the target, an angle measurement function for determining alignment of the beam guiding unit relative to the base (40) and a target search unit. The target search unit has illumination means (25) for illuminating the target, a first camera (24) with a first position-sensitive detector, a first image being acquirable with the first camera (24) and, in the first image, at least one part of the illumination beam reflected on the target being determinable as a first target position, and a control and evaluation unit. The target search unit also has a second camera (24) with a second position-sensitive detector, a second image being acquirable with the second camera (24) and, in the second image, at least one part of the illumination beam reflected on the target being determinable as a second target position and the second camera (24) being arranged with a camera positioning that is known or fixed in relation to the first camera (24) in such a manner that the fields of vision of the first and second cameras (24) at least partially overlap. When the search function is operated, the target is located in relation to the first and second target positions. |
