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Laser tracker and method of determining change in distance to a target

A technology of laser tracker and distance change, applied in the field of laser tracker, which can solve complex control and calibration problems

Active Publication Date: 2020-09-25
LEICA GEOSYSTEMS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using this setup in a laser tracker, however, a particular disadvantage is that as a result of the large operating temperature range in the laser tracker, pointing stability requires active control of the beam direction in order to maintain coupling efficiency into the fiber
In addition to the associated complex control and alignment of the laser beam source, further optimization of the space required in the laser tracker is additionally limited

Method used

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  • Laser tracker and method of determining change in distance to a target
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  • Laser tracker and method of determining change in distance to a target

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Embodiment Construction

[0072] figure 1 Shown is the structure of a laser beam source 20 according to the invention having a laser diode 3 located in a thermoelectric temperature stabilization chamber 2 hereinafter referred to as a TEC chamber. Laser diode 3, collimating unit 4 with collimating optical unit 4', 4", followed by micro-isolator unit 5 and decoupling unit 6 are located in a hermetically shielded TEC chamber 2, laser diode 3 such as a DBR diode. The coupling unit 6 has in particular a polarization maintaining fiber coupler unit 7 for coupling the generated measurement radiation into an optical fiber 10 and, optionally, by means of at least one beam splitter, in the In the precisely shown example a beam splitter 8; there may be further universal fiber coupling units for coupling to further optical fibers 11, 11* (not shown), in the shown example a further optical fiber Coupling unit 9. If a beam splitter is used, the microisolator unit 5 preferably has two microisolators 5', 5", which are...

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Abstract

Laser tracker and method for determining change in distance to a target. The invention relates to a laser tracker (1) having: a distance measuring unit configured as an interferometer (21); a laser beam source (20) configured as a laser diode; a base (40 ), defining a vertical axis; a beam guiding unit (43), for emitting measurement radiation and for receiving at least a part of the measurement radiation (22) reflected on the target, pivotable by a motor around the vertical axis and the tilt axis; and the angle Measurement function, laser beam source (20) integrated into thermoelectric temperature stabilization chamber (2), at least the following components are arranged in TEC chamber (2): laser diode (3), collimating optics (4), optical microisolator Unit (5), at least one polarization maintaining fiber coupler (7) for measuring radiation (22) to the interferometer (21).

Description

technical field [0001] The invention relates to a laser tracker for determining distance changes relative to a target, the laser tracker having an interferometer and a laser beam source in a thermoelectric temperature stabilization chamber, the laser beam source being configured as a laser diode, the thermoelectric temperature stabilization The chamber is hereinafter referred to as the TEC chamber; the use of a laser diode located in the TEC chamber in the corresponding interferometer; and the method for determining the relative distance to the target. Background technique [0002] Measuring devices configured to progressively track a target point and determine the coordinate position of this point can generally be summarized under the term laser tracker. The target point may in this case be represented by a retroreflective unit (for example a cube prism) which is aimed by using the optical measuring beam of the measuring device, in particular a laser beam. The laser beam i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/32G01S17/36G01S17/66G01S7/481G01S7/497
CPCG01S7/4814G01S7/4817G01S7/4818G01S7/497G01S17/32G01S17/36G01S17/66G01B9/02038G01B9/02068G01B9/02075F25B21/02G01B2290/70F25B2321/021
Inventor T·鲁斯
Owner LEICA GEOSYSTEMS AG