Laser range sensor system optics adapter and method

• US 7,859,649 B2
• Filed: 04/27/2007
• Issued: 12/28/2010
• Est. Priority Date: 05/02/2006
• Status: Active Grant

• Current Assignee: Quality Vision International, Inc.
• Original Assignee: Quality Vision International, Inc.
• Inventors: Araghi, Mehdi N., Kay, David B., Gesner, Eric G.
• Primary Examiner(s): Tarcza; Thomas H
• Assistant Examiner(s): Ratcliffe; Luke D
• Application Number:
  US11/741,129
• Publication Number:
  US 20070258709A1
• Time in Patent Office: 1,341 Days
• Field of Search: 356 301- 315, 356 401- 41, 356 501- 515, 356 6- 22
• US Class Current: 356/4.01
• CPC Class Codes: G01C 11/00 Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
• CPC Class Codes: G01S 17/08 for measuring distance only indirect measurement G01S17/46; active triangulation systems G01S17/48

Abstract

An adapter and method for through the lens (TTL) laser range sensor probes enables use of a TTL probe of a given exit pupil size to be used with a shared objective lens requiring a entrance pupil size, as entered from the laser range sensor, that is different from the TTL probe exit pupil size. Embodiments of the adapter include optics, such as a first lens and a resolving second lens that expand or contract the TTL laser radiation depending on whether the first lens is a diverging, a negative focal length lens, or a converging, positive focal length lens, and the second lens is converging or diverging, respectively, in a Galilean arrangement. Embodiments also provide a Keplerian arrangement, can function with non-collimated radiation, and can include mirrors to yield a more compact adapter. Additional embodiments include at least one adjustable lens element between the first and second lenses, the at least one adjustable lens element being connected to an actuator for movement along the optical path. The adapter can be arranged in a folded configuration in which mirrors are used to form a more compact adapter.

Claims

1. In an optical system including a through the lens laser range sensor and a zoom optical apparatus sharing an objective lens requiring TTL laser range sensor radiation at an objective lens entrance pupil, the laser range sensor having an exit pupil from which it emits radiation and through which radiation returns for detection, a laser range sensor adapter comprising a first lens that selectively receives radiation emitted by the through the lens laser range sensor at a first size and a second lens that receives the radiation from the first lens and resolves the beam at a second size at which TTL laser range sensor radiation substantially optimally fills the objective lens entrance pupil.

2. The adapter of claim 1 wherein the first lens is a diverging lens and the second lens is a converging lens, the adapter thus expanding the radiation.

3. The adapter of claim 1 wherein the first lens is a converging lens and the second lens is a diverging lens, the adapter thus contracting the radiation.

4. The adapter of claim 1 wherein the first and second lenses are both converging lenses with an intermediate focus therebetween.

5. The adapter of claim 1 further comprising at least one mirror arranged between the first and second lenses reflecting light from the first lens to the second lens.

6. The adapter of claim 5 wherein the at least one mirror comprises two mirrors.

7. The adapter of claim 6 wherein radiation passes through the first lens to a first mirror, which reflects the radiation to a second mirror, which reflects the radiation through the second lens and out of the adapter.

8. The adapter of claim 7 wherein an angle between radiation entering the adapter and radiation leaving the adapter is substantially ninety degrees.

9. The adapter of claim 1 further comprising at least one extra lens between the first and second lenses, the at least one extra lens including at least one movable element to enable adjustment of the output of the adapter.

10. The adapter of claim 9 further comprising a first conditioning lens between an entrance of the adapter and the at least one extra lens that receives non-collimated radiation and alters the radiation for the at least one extra lens.

11. The adapter of claim 9 further comprising a second conditioning lens between the at least one extra lens and the exit of the adapter that receives radiation from the at least one extra lens and alters the radiation for exit from the adapter.

12. In a metrology system including a TTL laser range sensor probe with an exit pupil from which it emits radiation toward and receives radiation from an optical system, the optical system including an objective and a zoom lens system with an objective lens requiring a desired diameter of the radiation that is different from an original diameter of the TTL laser range sensor as transmitted through the exit pupil, an adapter comprising a first lens that changes the radiation from the original diameter and a second lens that resolves the radiation at the desired diameter, the desired diameter substantially optimally filling an objective entrance pupil.

13. The adapter of claim 12 wherein the first lens is a diverging lens and the second lens is a converging lens, the adapter thus expanding the radiation.

14. The adapter of claim 12 wherein the first lens is a converging lens and the second lens is a diverging lens, the adapter thus contracting the radiation.

15. The adapter of claim 12 wherein the first and second lenses are both converging lenses with an intermediate focus therebetween.

16. The adapter of claim 12 further comprising at least one mirror arranged between the first and second lenses reflecting light from the first lens to the second lens.

17. The adapter of claim 16 wherein the at least one mirror comprises two mirrors.

18. The adapter of claim 17 wherein radiation passes through the first lens to a first mirror, which reflects the radiation to a second mirror, which reflects the radiation through the second lens and out of the adapter.

19. The adapter of claim 18 wherein an angle between radiation entering the adapter and radiation leaving the adapter is substantially ninety degrees.

20. The adapter of claim 12 further comprising at least one extra lens between the first and second lenses, the at least one extra lens including at least one movable element to enable adjustment of the output of the adapter.

21. The adapter of claim 20 further comprising a first conditioning lens between an entrance of the adapter and the at least one extra lens that receives non-collimated radiation and alters the radiation for the at least one extra lens.

22. The adapter of claim 20 further comprising a second conditioning lens between the at least one extra lens and the exit of the adapter that receives radiation from the at least one extra lens and alters the radiation for exit from the adapter.

23. A method of using a TTL probe with an original exit pupil size with an optical system employing an objective requiring a different, desired entrance pupil size as entered from the laser range sensor, the TTL probe emitting, and receiving, radiation through the original diameter of the exit pupil, the method comprising:

providing a first lens that changes the original diameter of the radiation transmitted by the TTL probe; and

providing a second lens that resolves the radiation with a desired diameter substantially equal to a desired objective lens entrance pupil diameter.

24. The method of claim 23 wherein providing a first lens comprises providing a diverging lens and providing a second lens comprises providing a converging lens, the adapter thus expanding the radiation.

25. The method of claim 23 wherein providing a first lens comprises providing a converging lens and providing a second lens comprises providing a diverging lens, the adapter thus contracting the radiation.

26. The method of claim 23 wherein providing a first lens comprises providing a converging lens and providing a second lens comprises providing a converging lens beyond an intermediate focus between the first and second lenses.

27. The method of claim 23 further comprising providing at least one mirror, arranging the at least one mirror between the first and second lenses, the at least one mirror reflecting light from the first lens to the second lens.

28. The method of claim 27 wherein providing at least one mirror comprises providing two mirrors such that radiation passes through the first lens to a first mirror reflecting the radiation to a second mirror reflecting the radiation through the second lens and out of the adapter.

29. The method of claim 28 wherein an angle between radiation entering the adapter and radiation leaving the adapter is substantially ninety degrees.

30. The method of claim 23 further comprising providing at least one extra lens between the first and second lenses, the at least one extra lens including at least one movable element to enable adjustment of the output of the adapter.

31. The method of claim 30 further comprising providing a first conditioning lens between an entrance of the adapter and the at least one extra lens that receives non-collimated radiation and alters the radiation for the at least one extra lens.

32. The method of claim 30 further comprising providing a second conditioning lens between the at least one extra lens and the exit of the adapter that receives radiation from the at least one extra lens and alters the radiation for exit from the adapter.