Aspheric surface topographer

Details Aspheric surface topographer Aspheric surface topographer

1990-11-08

1992-11-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351247, A61B 310

Patent

active

051647508

ABSTRACT:
An instrument for measuring the surface contour of optical elements having aspheric surfaces accommodates large numerical aperture optical elements. A null lens composed of only spheric surfaces is inserted into the optical path for nulling an aspheric surface under test, such as parabola or hyperbola, so that the aberration is zero as indicated by a reduced Ronchi fringe image from a Ronchi test grating located at the optical path focus. The surface contour of the aspheric surface is obtained as equivalent to the conjugate of the null lens.

REFERENCES:
patent: 4692003 (1987-09-01), Adach et al.

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