Absolute distance meter that measures a moving retroreflector

A retroreflector, absolute distance technology, used in measurement devices, radio wave measurement systems, instruments, etc.

Inactive Publication Date: 2007-09-05
FARO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because absolute distance measurements are only available for fixed targets

Method used

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  • Absolute distance meter that measures a moving retroreflector
  • Absolute distance meter that measures a moving retroreflector
  • Absolute distance meter that measures a moving retroreflector

Examples

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Embodiment Construction

[0014] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings.

[0015] An exemplary laser tracker 10 is shown in FIG. 1 . An exemplary gimbal beam steering mechanism 12 for a laser tracker includes an apex mount 14 mounted on an azimuth mount 16 . Both the apex and azimuth mechanical axes (not shown) inside the tracker are rotated to point the laser beam 46 in the desired direction. As will be described below, the laser beam may include one or more laser wavelengths. Apex and azimuth encoders (not shown) inside the tracker are coupled to the apex and azimuth mechanical axes and indicate the angle of rotation with a high degree of accuracy. For clarity and simplicity, this type of gimbal mechanism 12 is used in the following description. However, other types of gimbals are possible, and the techniques described herein may be applied to these other types of gimbals as well.

[0016] Laser beam 46 pas...

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PUM

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Abstract

A laser device and method capable of one or more dimensional absolute distance measurements and/or surface scanning and/or coordinate measurements of a moving external retroreflector or other moving target surfaces without using an incremental interferometer.

Description

technical background [0001] The present disclosure relates to coordinate measuring equipment. A coordinate measuring device is a class of instruments that measure the coordinates of a point by firing a laser beam at the point. The laser beam may be directed onto the point or may be directed onto a retroreflector target in contact with the point. In either case, the instrument determines the coordinates of the point by measuring the distance to the target and two angles. Distances are measured with distance measuring devices such as absolute range finders or interferometers. The angle is measured with an angle measuring device, such as an angle encoder. A gimbaled beam steering mechanism inside the instrument directs the laser beam to the point of interest. Example systems for determining coordinates of points are described in Brown et al., US Patent 4,790,651 and Lau et al., US Patent 4,714,339. [0002] A laser tracker is a special class of coordinate measuring device th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/36G01S17/66G01S17/58
CPCG01B11/024G01P3/36G01S17/36G01S17/42G01S17/50G01S17/58G01S17/66
Inventor 罗伯特·E.·布里奇斯约翰·M.·霍弗
Owner FARO TECH INC
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