Optical position detection

• US 5,005,979 A
• Filed: 07/31/1989
• Issued: 04/09/1991
• Est. Priority Date: 07/30/1988
• Status: Expired due to Fees

• Current Assignee: Dornier GmbH (Government of France)
• Original Assignee: Dornier GmbH (Government of France)
• Inventors: Fritzsch, Walter, Hundhausen, Rainer, Ludwig, Wolfgang, Elias, Hartmut, Eschner, Wolfgang, Kratz, Harald, Sontag, Heinz
• Primary Examiner(s): Evans, F. L.
• Assistant Examiner(s): Hantis, K. P.
• Application Number:
  US07/387,623
• Time in Patent Office: 617 Days
• Field of Search: 356/375, 356/1
• US Class Current: 356/622
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01D 5/268 using optical fibres G01D5/28 - G01D5/38 take precedence

Abstract

An apparatus for determining the position of an object comprises a light source positioned in relation to the object so that at least one collimated beam is issued from a particular positon on the object and bearing a fixed and definite geometric relationship to the sought position; a fluorescent foil or plate is positioned in relation to such object such that a particular spot is stimulated by that collimated beam which then provides the fluorescence; a plurality of fiber optics are arranged such that one end of each fiber optics is placed on a particular geometric pattern to receive radiation from the stimulated spot while the respective other end of each fiber optics is arranged in a similar but smaller scale geometric pattern as the first ends are and in relation to a detector that provides an electrical signal representing the position of the object.

Claims

1. Apparatus for determining the position of objects comprising:

light source means positioned in relation to one of said objects such that form a particular position on the one object three collimated beams issue respectively bearing different but fixed and definite positional relationship to the position of said one object, and being differently modulated;

a planar flourescent foil or plate positioned in relation to said one object such that three spots on said foil are stimulated bearing in a two dimensional fashion a very definite position relationship to the position of the one object owing to the utilization of said three collimated beams that provide the stimulations;

a plurality of fiber optics, each having a first and a second end, respective first ends of the respective fiber optics of the plurality of fiber optics being arranged in a spatial relation to said flourescent foil or plate, that establishes and is a particular geometric pattern of positioning, to receive in each instance radiation from such stimulated spots, respective other ends of the fiber optics being arranged in a similar but smaller scale geometric pattern as the first ends are; and

detector means in relation to said other ends providing electrical signals that represent the position of said object there being a demodulator included in the detection means in order to differentiate among the different spots, by demodulating in accordance with the different modulations.

2. Apparatus as in claim 1, wherein external source light is applied to that object whose interception results in the light for the collimated beams.

3. Apparatus as in claim 1, wherein a light source is affixed to the object to identify its position and a particular relation in respect thereto.

4. Apparatus as in claim 1, wherein the plural collimating beams run from the object in different directions but all being intercepted by that plate or foil.