Measurement system with a measuring device and a scanning module

Patent metadata

Field	Value
Publication number	US-9658335-B2
Application number	US-201314375423-A
Country	US
Kind code	B2
Filing date	Jan 30, 2013
Priority date	Jan 30, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention relates to a measurement system 50 having a measuring device 20 and a scanning module 10 which has: a fastening means for fastening the scanning module 10 onto a holder; a beam deflection element 11 that is rotatable by a motor about an axis of rotation 12 to deflect a scanning laser beam 60 , wherein the axis of rotation 12 is arranged at a defined angle relative to the pivoting axis 22 ; and a second angle measurement functionality 13 for determining an angle of rotation from an angle position of the beam deflection element 11 . In addition, the measuring device 20 has a holder designed such that the scanning module 10 can be fastened by means of the fastening means in a module-like manner in a defined position on the measuring device 20.

First claim

What is claimed is:

1. A measurement system comprising
a measuring device, comprising
a base,
a construction arranged on the base and pivotable about a pivoting axis,
a targeting unit, wherein the targeting unit has at least
an emission unit for emitting a first laser beam, said emission unit defining an optical target axis, and
a first distance meter for measuring a distance to an object, and

a first angle sensor for highly precisely acquiring at least one pivoting angle defined by a relative pivoting position of the construction with respect to the base,

a control and processing unit for data processing and for control of the measurement system,
wherein
the measurement system has a scanning module comprising
a fixing apparatus for fixing the scanning module to a receptacle corresponding to the fixing apparatus,
a beam deflection element for deflecting a scanning laser beam, said beam deflection element being rotatable about a rotation axis in a motorized fashion, wherein the rotation axis in a received state is at a defined angle relative to the pivoting axis, and
a second angle sensor for determining a rotation angle from an angular position of the beam deflection element,

the measuring device has a receptacle embodied in such a way that the scanning module can be fixed in a modular manner in a defined positioning on the measuring device as a result of an interaction of the receptacle with the fixing apparatus,
the control and processing unit is embodied in such a way that
the respective rotation angle, the respective pivoting angle and the respective distance for a point on the object are combined, such that a respective point position is defined by the combination, and
a point cloud having a number of the point positions can be generated.

2. The measurement system as claimed in claim 1 , wherein
the scanning module has a beam passage unit, and the targeting unit can be aligned in such a way that the first laser beam can be coupled into the scanning module by means of the beam passage unit in a coupling-in state and can be deflected in a rotating fashion as a scanning laser beam about the rotation axis by means of the beam deflection element, wherein a scanning laser beam reflected at the object can be coupled out from the scanning module by means of the beam passage unit.

3. The measurement system as claimed in claim 2 , wherein the scanning module has an acquisition unit embodied in such a way that an impingement position of the first laser beam, which can be deflected onto the acquisition unit by means of the beam deflection element in the coupling-in state, on the acquisition unit can be acquired, wherein a positioning parameter indicating a relative positioning of the scanning module with respect to the measuring device can be generated depending on the impingement position, wherein the point positions can be corrected by means of the positioning parameter.

4. The measurement system as claimed in claims 1 , wherein
the scanning module has a beam source for emitting a second laser beam as a scanning laser beam, and the scanning laser beam can be deflected in a rotating fashion about the rotation axis by means of the beam deflection element, wherein the scanning module has a second distance meter for distance measurement by means of the scanning laser beam.

5. The measurement system as claimed in claim 1 , wherein
the measurement system has an at least two-component centering apparatus for the defined positioning of the scanning module on the measuring device, wherein a first component is assigned to the scanning module and a second component is assigned to the measuring device, wherein a positioning accuracy can be measured by means of sensors for determining a relative positioning of the first component with respect to the second component.

6. The measurement system as claimed in claim 1 , wherein
the measurement system has at least one distance measuring sensor for measuring a distance between the scanning module and the measuring device in the received state for generating a further positioning parameter indicating the relative positioning of the scanning module with respect to the measuring device, and/or
the measurement system has a camera for acquiring an image.

7. The measurement system as claimed in claim 1 , wherein an inclination of the scanning module relative to the measuring device can be determined by means of scanning of a prominent structure, wherein the inclination is determined depending on a comparison of a scanning point cloud representing the prominent structure and generated by means of the scanning module and a measurement point cloud representing the prominent structure and generated by means of the measuring device.

8. A scanning module for a measurement system as claimed in claim 1 , comprising
a beam deflection element for deflecting a scanning laser beam, said beam deflection element being rotatable about a rotation axis in a motorized fashion,
an angle sensor for determining a rotation angle from an angular position of the beam deflection element,
wherein
the scanning module has a fixing apparatus for fixing the scanning module to a receptacle corresponding to the fixing apparatus, wherein the scanning module can be fixed in a modular manner in a defined positioning on the measuring device as a result of an interaction of the fixing apparatus with the receptacle arranged on a measuring device, and
the scanning module is designed for transferring the rotation angle to a control and processing unit in accordance with the measurement system as claimed in claim 1 .

9. The scanning module as claimed in claim 8 , wherein
the scanning module has a beam passage unit for coupling in and/or coupling out the scanning laser beam, such that at least the coupled-in scanning laser beam can be deflected in a rotating manner about the rotation axis by means of the beam deflection element.

10. The scanning module as claimed in claim 8 , wherein
the scanning module has a beam source for emitting the scanning laser beam, and the scanning laser beam can be deflected in a rotating manner about the rotation axis by means of the beam deflection element, and/or
the scanning module has an acquisition unit for acquiring the scanning laser beam, wherein the acquisition unit has a distance meter for measuring distance with respect to an object and/or a position-sensitive sensor for determining an impingement position of the scanning laser beam on a sensor.

11. The scanning module as claimed in claim 8 , wherein the scanning module has a data interface embodied in such a way that information is transmitted from the scanning module to the measuring device, connected to the scanning module by means of the fixing apparatus, wherein the information can be transmitted between scanning module and device.

12. The scanning module as claimed in claim 11 , wherein the information comprises angle information and/or distance information.

13. The scanning module as claimed in claim 1 , wherein
the scanning module has a control and processing unit for data processing and for controlling the alignment of the beam deflection element, wherein the control and processing unit is designed in such a way that, after obtaining pivoting angle information generated by the measuring device and distance information indicating the distance to an object,
the respective rotation angle, the respective pivoting angle and the respective distance for a point on the object are combined, such that a respective point position on the object is defined by the combination, and
a point cloud having a number of the point positions can be generat

Assignees

• Hexagon Technology Ct Gmbh

Inventors

• Siercks Knut
• Metzler Bernhard

Classifications

• G01S7/4817

  relating to scanning · CPC title

• G01C15/002 Primary

  Active optical surveying means (optical plumbing G01C15/105) · CPC title

• G01C15/006

  Detectors therefor · CPC title

• G01S17/89 Primary

  for mapping or imaging · CPC title

• G01C1/02

  Theodolites · CPC title