Device for determining the position of spaced-apart areas in...

Details Device for determining the position of spaced-apart areas in... Device for determining the position of spaced-apart areas in...

2006-01-28

2010-02-02

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

For dimensional measurement

C356S497000

Reexamination Certificate

active

07656537

ABSTRACT:
The invention is directed to a device for determining the thickness, distance and/or profile of areas of a transparent and/or diffuse object that are spaced apart, in particular for measuring distances in the eye. In the device for determining position using an interferometer arrangement based on the Michelson principle, a scanning unit is arranged for the change in path length in the reference beam or measurement beam path. The scanning unit comprises a scan table which is movable translationally in corresponding guides, the movement direction enclosing an angle α to the reference beam. At least two reference mirrors having a distance d in direction of the reference beam and slightly overlapping laterally are arranged on the scan table so that during the oscillating movement of the scan table carried out by a motor the reference beam is reflected in itself first by the first reference mirror and then by the second reference mirror.

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