Process and apparatus for measuring an object space

Optics: measuring and testing – Range or remote distance finding – With photodetection

Reexamination Certificate

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C356S612000, C356S141100, C382S154000

Reexamination Certificate

active

06879384

ABSTRACT:
A process and an apparatus for measuring an object space using an opto-electronic range finder which operates according to a method of determining the time-of-flight of a signal comprise a first measuring step including transmitting optical transmitter signals in form of a beam of a predetermined first divergence angle, receiving optical signals reflected from an object and evaluating a distance value, while scanning the object space. After or before this first take-up step follows a second one wherein reference marks in the object space are taken up with a using an enlarged divergence angle so as to detect reliably the reference marks. The apparatus comprises, accordingly, appropriate devices for varying the divergence angle.

REFERENCES:
patent: 4950075 (1990-08-01), Ichinose et al.
patent: 5361217 (1994-11-01), Makimura et al.
patent: 5988862 (1999-11-01), Kacyra et al.
patent: 6563574 (2003-05-01), Ohtomo et al.

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