Retroreflector comprising fisheye lens

Patent metadata

Field	Value
Publication number	US-11543244-B2
Application number	US-201916576690-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	Sep 20, 2018
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A reflector arrangement for position determination and/or marking of target points, comprising a retroreflector and a first sensor arrangement, by means of which the orientation measurement radiation passing through the retroreflector is acquirable. The first sensor arrangement comprises a first optical assembly providing a fisheye lens, and a first sensor, wherein the retroreflector and the first sensor arrangement are arranged in such a way that orientation measurement radiation passing through the retroreflector is projectable onto the detection surface of the first sensor by means of the first optical assembly.

First claim

What is claimed is:

1. A reflector arrangement for position determination or marking of target points, the reflector arrangement comprising:
a retroreflector, which:
provides a position determination for the reflector arrangement by means of parallel measurement beam reflection, and
provides a passage surface for at least one part of measurement radiation entering the retroreflector as an orientation measurement radiation; and

a first sensor arrangement, by means of which the orientation measurement radiation passing through the retroreflector is acquirable, wherein the first sensor arrangement includes:
a first optical assembly, and
a first sensor,

wherein the retroreflector and the first sensor arrangement are arranged in such a way that the orientation measurement radiation passing through the retroreflector is deflectable onto a detection surface of the first sensor by means of the first optical assembly.

2. The reflector arrangement according to claim 1 , wherein the first optical assembly defines a field of view having:
an elevative acquisition angle of up to 130° with respect to the optical axis,
an azimuthal acquisition angle of 360°,
the detection surface of the first sensor is arranged in such a way that the field of view of the first optical assembly is imagable onto the detection surface of the first sensor, and
the reflector arrangement has a total field of view having:
i. an elevative acquisition angle of at least 30° and up to 60°.

3. The reflector arrangement according to claim 1 , wherein the first sensor:
a. is configured for determining an impingement position of the orientation measurement radiation on the detection surface of the first sensor, or
b. is embodied for image acquisition and the impingement position of the orientation measurement radiation is acquirable in an image.

4. The reflector arrangement according to claim 3 , wherein:
a. the reflector arrangement comprises an evaluation unit designed for deriving a spatial orientation of the reflector arrangement relative to a propagation axis of the measurement radiation entering the retroreflector with respect to at least one degree of freedom on the basis of the impingement position.

5. The reflector arrangement according to claim 1 , wherein:
a. the first optical assembly comprises a plurality of spherical lens elements or an optical component having an aspherical surface.

6. The reflector arrangement according to claim 1 , wherein:
a. the reflector arrangement comprises an optical coupling element between the retroreflector and the optical assembly, wherein
i. an interaction of the optical coupling element with the retroreflector and the first optical assembly provides an increased light refractive power of the reflector arrangement, and
ii. the optical coupling element contacts the retroreflector or the first optical assembly.

7. The reflector arrangement according to claim 6 , wherein the optical coupling element is embodied as an anamorphic coupling element.

8. The reflector arrangement according to claim 1 :
a. the retroreflector is embodied as a prism, wherein the prism comprises:
i. a light entrance surface forming a triangle, and
ii. the passage surface as aperture, said passage surface being situated opposite the light entrance surface.

9. The reflector arrangement according to claim 1 :
a. the reflector arrangement is embodied as a 360° retroreflector comprising a plurality of retroreflectors, said retroreflectors being arranged in a manner adjoining one another and being embodied as prisms, wherein
i. the plurality of prisms are arranged in a ring-shaped manner, and
ii. the 360° retroreflector defines an azimuthal total field of view of 360°.

10. The reflector arrangement according to claim 9 , wherein:
a. the reflector arrangement comprises a second sensor arrangement comprising a second optical assembly and a second sensor, wherein the first sensor arrangement is assigned to a first prism group and the second sensor arrangement is assigned to a second prism group.

11. The reflector arrangement according to claim 10 , wherein:
i. the first prism group and the first sensor arrangement provide an acquisition, by the first sensor, of the orientation measurement radiation which is providable by the first prism group and is projectable onto the first sensor by means of the first optical assembly, and
ii. the second prism group and the second sensor arrangement provide an acquisition, by the second sensor, of the orientation measurement radiation which is providable by the second prism group and is projectable onto the second sensor by means of the second optical assembly.

12. The reflector arrangement according to claim 9 , wherein:
i. the midpoints of passage surfaces of the plurality of prisms of a first prism group lie in a first plane and the midpoints of passage surfaces of the prisms of a second prism group lie in a second plane, and
ii. the first plane and the second plane are aligned parallel to one another and are at a specific distance.

13. The reflector arrangement according to claim 1 , wherein:
a. at least the first sensor is embodied as a polarization-resolving sensor,
wherein:
i. adjacent sensor pixels are assigned differently polarization-sensitive matrix elements, and
ii. the first sensor provides a calculation of the Stokes vector on the basis of an intensity evaluation of the adjacent sensor pixels.

14. The reflector arrangement according to claim 1 , wherein:
a. the reflector arrangement comprises a control unit having an acquisition functionality, wherein the acquisition functionality is configured for the spatially resolved detection of the orientation measurement radiation by means of multiple read-out of the first sensor, wherein at least a first read-out is effected with measurement information regarding orientation measurement radiation impinging on the detection surface of the first sensor and a second read-out is effected without said measurement information.

15. An auxiliary measuring instrument comprising a reflector arrangement according to claim 1 , wherein the auxiliary measuring instrument is embodied for the non-contact or tactile acquisition of a target point at an object with a defined position reference with respect to the reflector arrangement.

Assignees

• Hexagon Technology Ct Gmbh

Inventors

• Jensen Thomas
• Schwendener Andreas
• Yang Zheng
• Stigwall Johan
• Brühlmann Danick

Classifications

• G01C11/02

  Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures · CPC title

• G01S7/481 Primary

  Constructional features, e.g. arrangements of optical elements · CPC title

• G01C15/06 Primary

  Surveyors' staffs; Movable markers · CPC title

• G01S17/42

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) · CPC title

• G01S17/74

  Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe · CPC title