Milking implement

1. A method for automatically milking a dairy animal, comprising a milk implement comprising a measuring device for measuring a position of an object comprising a displaceable element of the milking implement, and for measuring a position of a teat of the dairy animal, and a control device for controlling at least the measuring device, the method comprising the following steps:

(a) taking at least one measurement, using the measuring device, regarding two points on the object in order to obtain a position information regarding the object, and determining from the measured position information a mutual distance between the points,

(b) comparing the obtained position information with a known position information regarding the object using the control device, wherein the known position information comprises the known mutual distance between the points, and

(c) calibrating the measuring device on the basis of the comparison between the obtained position information and the known position information, wherein the control device performs the calibration.

2. The method according to claim 1 , wherein step (a) is repeated after a displacement of at least one of the measuring device and the object and wherein the known position information comprises the displacement.

3. The method according to claim 1 , wherein the control device in (c) is configured to perform a two-dimensional calibration on the basis of the known mutual distance between the points and the known displacement.

4. The method according to claim 1 , wherein step (a) further comprises:

measuring a position information regarding three points on the object, and

determining mutual distances between the points on the basis of the measured relative positions,

wherein the known position information comprises mutual distances between the points.

5. The method according to claim 1 , wherein the known position information is a known distance between the two points.

6. The method according to claim 1 , wherein the measuring device is arranged to perform a distance measurement using infrared light, wherein at least an infrared sensor of the measuring device is disposed in a housing having an infrared-transparent wall and wherein an optical path from or to the infrared sensor runs through the wall.

7. The method according to claim 6 , wherein the wall is made of a synthetic material.

8. The method according to claim 6 , wherein the wall is made as one integral whole.

9. The method according to claim 8 , wherein the housing forms a whole which is closed on all sides.

10. The method according to claim 6 , wherein the wall comprises a thinner part and an infrared light source is disposed behind the thinner part in order to radiate through the thinner part of the wall during operation.

11. The method according to claim 6 , wherein at least a part of the wall is lens-shaped.

12. The method according to claim 6 , wherein a receiver is disposed in the housing for wireless transfer of data to the camera.

13. The method according to claim 12 , wherein the receiver comprises at least one of an inductive receiver and an optical receiver.

14. The method according to claim 6 , wherein a wireless data transmission device is included in the housing for data transmission from or to the camera.

15. The method according to claim 1 , wherein the displaceable element comprises at least one of: a teat cup, an assembly of teat cups, and a spraying robot.