Optical position and orientation sensor

• US 5,059,789 A
• Filed: 10/22/1990
• Issued: 10/22/1991
• Est. Priority Date: 10/22/1990
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Salcudean, Septimiu E.
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): Shami, Khaled
• Application Number:
  US07/601,149
• Time in Patent Office: 365 Days
• Field of Search: 250/561, 250/206.1, 250/206.2, 356/141, 356/152
• US Class Current: 250/206.1
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01S 5/163 Determination of attitude using inertial means G01C9/00; control of attitude G05D1/49

Abstract

An optical position determination system is described which determines the six degrees of freedom (i.e. position of orientation) of an object with respect to a two-dimensional position sensing detector. The system comprises at least three energy beams physically connected to the object and directed to corresponding points of incidence on a surface of the position sensing detector. The energy beams are selectively energized to enable the position sensing detector to provide outputs indicative of the positions of the points of incidence. A microcomputer is responsive to those outputs to calculate the position of their common point of intersection. A single position sensing detector is thereby able to provide complete, three-dimensional information on the position of the object.

Claims

1. An optical position determination system for determining the relative position of an object with respect to a two-dimensional position sensing detector comprising:

energy source means connected to said object for directing at least three energy beams to points of incidence on said position sensing detector;

means connected to said energy source means for characterizing each said energy beam, whereby said position sensing detector provides outputs which are indicative of the position of each said point of incidence; and

computer means responsive to said outputs for calculating the position and orientation of said object.

2. The optical position determination system of claim 1 wherein each said energy beam is pointed in a direction orthogonal to others of said energy beams.

3. The optical position determination system of claim 1 wherein lines coincident with the energy beams intersect.

4. The optical position determination system of claim 2, wherein said beam characterization comprises sequentially energizing said energy beams to provide sequential outputs from said position sensing device, said sequential outputs indicative of the location of said points of incidence.

5. The optical position determination system of claim 2, wherein said beams are characterized by modulating each said beam at a different frequency, whereby said position sensing detector provides differing frequency outputs which are indicative of the locations of said points of incidence.

6. The optical position determination system of claim 1, wherein said energy source means comprises:

support means; and

at least three light emitters mounted on said support means, for generating three beams of light towards said position sensing detector, each said light beam oriented orthogonally with respect to others of said beams.

7. The optical position determination system of claim 6 wherein said three light emitters are mounted on said support means so that said beams define a common point of intersection which is internal to said support means.

8. The optical position determination system of claim 7 wherein said support means comprises:

a cube having three intersecting channels formed therein; and

a diode light emitter mounted at one extremity of each said channel, whereby each said channel directs a light beam from a said diode to said position sensing detector.