Measuring device
A measuring device includes a movable probe head and an optical position sensing device for determining the spatial position and orientation of the probe head relative to a reference point. The position sensing device includes at least three position determination modules, arranged as a transmission unit or as a receiving unit, at least one position determination module being situated on the probe head, and at least one position determination module being situated at the reference point. A transmission unit has transmission unit marking element(s). A receiving unit includes optoelectronic detector(s) and receiving unit marking element(s), positioned in a defined spatial relationship relative to the optoelectronic detector. Visual contacts exist between at least some of the position determination modules. The position determination module on the probe head and the position determination module at the reference point are connected by at least one uninterrupted chain of visual contacts.
1. A measuring device, comprising:
a spatially-movable probe head;
an optical position sensing device adapted to determining a spatial position and orientation of the probe head relative to a reference point, the position sensing device including at least three position determination modules, arranged as a transmission unit, including at least one transmission unit marking element, or as a receiving unit, including at least one optoelectronic detector and at least one receiving unit marking element arranged in a defined spatial relationship relative to the optoelectronic detector, at least one position determination module arranged on the probe head, at least one position determination module arranged at the reference point, at least one position determination module arranged as a receiving unit;
wherein visual contacts exist between at least some of the position determination modules; and
wherein the position determination module arranged on the probe head and the determination module arranged at the reference point are connected by at least one uninterrupted chain of visual contacts.
2. The measuring device according to claim 1 , wherein at least two uninterrupted chains of visual contacts are provided between the position determination module on the probe head and the position determination module at the reference point, the chains of visual contacts being connected to one another by at least one visual contact between position determination modules that are provided between the probe head and the reference point.
3. The measuring device according to claim 1 , wherein more than two uninterrupted chains of visual contact are provided only in a first portion of a measuring range of the measuring device and only one uninterrupted chain of visual contacts is provided in further, second portions of the measuring range.
4. The measuring device according to claim 1 , wherein the optoelectronic detectors of the receiving units are thermally and/or mechanically connected to the receiving unit marking element in an invariant manner via a carrier frame.
5. The measuring device according to claim 1 , wherein at least one scanning grating is provided upstream from the optoelectronic detector in the receiving unit.
6. The measuring device according to claim 1 , wherein the transmission unit marking element and/or the receiving unit marking element is identifiable.
7. The measuring device according to claim 6 , wherein the transmission unit marking element and/or the receiving unit marking element includes a light source.
8. The measuring device according to claim 7 , wherein the light source is selectively activatable in time by a control and evaluation device for identification purposes.
9. The measuring device according to claim 7 , wherein the control and evaluation device is adapted to determine an angular position of a measured light source relative to the receiving unit based on a position of a fringe pattern resulting on the optoelectronic detector of a receiving unit, so that a spatial pose of the probe head and of at least two position determination modules relative to the reference point are determinable via identification of the transmission unit marking element and/or the receiving unit marking element.
10. The measuring device according to claim 6 , further comprising a control and evaluation device adapted to determine a spatial pose of the probe head and spatial poses of the position determination modules relative to one another.
11. The measuring device according to claim 1 , wherein each transmission unit includes at least three transmission unit marking elements, and each receiving unit includes at least three receiving unit marking elements.
12. A machine tool, comprising:
a measuring device as recited in claim 1 ;
wherein the probe head is arranged in a tool holder of the machine tool and is adapted to measure a workpiece provided on a workpiece table of the machine tool; and
wherein the position determination module is arranged on a machine frame of the machine tool or on the workpiece table.
13. The machine tool according to claim 12 , wherein the probe head is arranged as a touch probe.
14. The machine tool according to claim 12 , wherein a position determination module, which is arranged as a transmission unit having at least three identifiable transmission unit marking elements, is provided on the workpiece table.
15. A machine, comprising:
a measuring device as recited in claim 1 ;
wherein the probe head is arranged on an end effector of a machine kinematic system;
wherein the probe head is adapted to measure a deviation between an actual position of the end effector and a set setpoint position; and
wherein at least one position determination module is arranged on a machine frame of the machine or on a workpiece table.