MEASURING DEVICE FOR NONCONTACT MEASUREMENT OF DISTANCES TO A TARGET OBJECT

• US 20120105825A1
• Filed: 10/28/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Abandoned Application

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Gogolla, Torsten, Würsch, Christoph, Schmidt, Peer, Tiefenthaler, Stefan, Habenbacher, Herwig, Doyen, Jean-Phillippe
• Application Number:
  US13/283,788
• Publication Number:
  US 20120105825A1
• Time in Patent Office: Days
• US Class Current: 356/8
• CPC Class Codes: G01C 15/002 Active optical surveying means optical plumbing G01C15/105
• CPC Class Codes: G01S 17/08 for measuring distance only indirect measurement G01S17/46; active triangulation systems G01S17/48
• CPC Class Codes: G01S 17/86 Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders

Abstract

A measuring device, having: a housing; a distance measuring unit situated in the housing uses an optical measuring beam, with the aid of which the distance between a reference point and at least one measuring point on a target object is measurable without contact; a photoelectric image acquisition unit situated in the housing having a viewfinder and camera lens situated in the housing as well as an image path connecting them for detecting target points of the target object, an image processing unit and a control and computation unit with the aid of which the image of the image processing unit is displayable. The image processing unit defines target points pixels in exactly one single photoelectric image, the control and computation unit allocating the distance of the reference point to the measuring point to at least one of the pixels, the allocation available for further processing.

Claims

1. A measuring device for a noncontact measurement of distances on a target object, the measuring device comprising:

a housing;

a distance measurer situated in the housing and utilizing an optical measuring beam, with aid of which a distance between a reference point and at least one measuring point on the target object is measurable without contact;

a photoelectric image acquirer situated in the housing, having a viewfinder and camera lens as well as an image path connecting the viewfinder and the camera lens for detecting target points of the target object;

an image processor for creating a photoelectric image of the target object; and

a controller capable of computation, the photoelectric image of the image processor being displayable with the aid of the controller,

the image processor designed to define at least a number of target points as a plurality of pixels in exactly one single image of the photoelectric image,

the controller designed to allocate the distance of the reference point to the measuring point to at least one of the pixels and to make the allocation available for further processing.

2. The measuring device as recited in claim 1 wherein the controller has a distance module designed to define a distance between a first pixel and a second pixel of the plurality of pixels as a pixel distance and to allocate a distance measure of the target points to the pixel distance.

3. The measuring device as recited in claim 2 wherein the distance module has an input for at least one reference measure and is designed to determine from the at least one reference measure at least approximately one image scale with the aid of which the distance measure is to be allocated to the pixel distance.

4. The measuring device as recited in claim 3 wherein the at least one reference measure at least includes:

a focal length of the viewfinder lens and camera lens and/or a pixel variable.

5. The measuring device as recited in claim 1 wherein the exactly one single photoelectric image results from a single recording of the target object, and exactly one measuring point is allocated to the photoelectric image.

6. The measuring device as recited in claim 2 wherein the distance module and/or the image processing unit is/are designed to define a plurality of distance measures between a plurality of target points.

7. The measuring device as recited in claim 1 wherein the controller has a joining module designed to combine a plurality of individual photoelectric images, each resulting from a single recording of the target object, each with exactly one corresponding measuring point to assemble them.

8. The measuring device as recited in claim 2 wherein the distance module is designed to allocate a plurality of distance measures between a plurality of target points to the pixel distance of pixels of the photoelectric image.

9. The measuring device as recited in claim 2 wherein the distance module is designed to define a surface measure within a polyhedron defined by a plurality of target points with the corresponding pixels.

10. The measuring device as recited in claim 1 wherein an electronic visual display in the housing is designed to display at least one distance measure and/or surface measure in the image.

11. The measuring device as recited in claim 1 wherein an electronic visual display in the housing is designed to display a distance of the reference point to the measuring point.

12. The measuring device as recited in claim 1 wherein the photoelectric image acquirer has a single viewfinder lens and camera lens.

13. The measuring device as recited in claim 1 wherein an image path of the image acquirer is guided via separate viewfinder lens biaxially to a transmission and/or reception path of the distance measurer, or the image path is guided coaxially to the transmission and/or reception path via a shared output element of transmission and/or reception optics on the one hand and the viewfinder lens on the other hand.

14. The measuring device as recited in claim 1 wherein the controller and/or the image processor has/have a transformation module designed to make available to a distance module a correction measure for a perspective distortion of a target object.

15. The measuring device as recited in claim 1 wherein distinctive target points are selectable automatically with the aid of the image processor or with the aid of an operating and input configuration and/or a visual display to define the plurality of the pixels.

16. The measuring device as recited in claim 1 wherein the controller has a coupling module, an output of a distance module being couplable via the coupling module to an input of a plan memory of a GPS system or distance information carrier.

17. The measuring device as recited in claim 1 wherein the image processor defines the measuring point as one of the plurality of pixels.

18. The measuring device as recited in claim 1 wherein the measuring device is in the form of a handheld device, and the housing is designed for manual use.

19. The measuring device as recited in claim 1 wherein measurement of the distance is made with the aid of a travel time measurement.

20. A method for noncontact measurement of distances on a target object comprising the steps:

measuring in a noncontact fashion a distance between a reference point and at least one measuring point on the target object;

acquiring a photoelectric image of the target object;

displaying the photoelectric image;

defining at least a number of target points as a plurality of pixels in exactly one single photoelectric image; and

allocating the distance of the reference point to the measuring point to at least one of the pixels and making available the allocation for further processing.

21. The method as recited in claim 20 wherein a distance between a first pixel and a second pixel is defined as a pixel distance, and a distance measure is allocated to the pixel distance.

23. The method as recited in claim 20 wherein an image scale is determined as a ratio of a focal length and a distance multiplied by a pixel variable.

24. The method as recited in claim 20 wherein measurement is made with a measuring device includes a housing;

a distance measurer situated in the housing and utilizing an optical measuring beam, with aid of which a distance z between a reference point and at least one measuring point on the target object is measurable without contact;

a photoelectric image acquirer situated in the housing, having a viewfinder and camera lens as well as an image path connecting the viewfinder and the camera lens for detecting target points of the target object;

an image processor for creating a photoelectric image of the target object; and

a controller capable of computation, the photoelectric image of the image processor being displayable with the aid of the controller, the image processor designed to define at least a number of target points as a plurality of pixels in exactly one single image of the photoelectric image, the controller designed to allocate the distance of the reference point to the measuring point to at least one of the pixels and to make the allocation available for further processing.

25. The method as recited in claim 24 wherein the measuring device is a handheld device.

26. The method as recited in claim 20 wherein the measuring in noncontact fashion is made with the aid of a travel time measurement.

22. The method as recited in claim 22 wherein from at least one reference measure, including a focal length of a viewfinder lens and camera lens and/or a pixel variable, an image scale is determined at least approximately with aid of which the distance measure is to be allocated to the pixel distance.