Interferometric self aligning fixture with parabolic and flat re

Details Interferometric self aligning fixture with parabolic and flat re Interferometric self aligning fixture with parabolic and flat re

1997-11-06

1999-02-02

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356363, G01B 902

Patent

active

058672729

ABSTRACT:
The present invention provides a lens holder (14) for a lens under test (26) in an in-line hologram interferometric test apparatus (10) which includes a flat reflective surface (34) for rotationally positioning the lens under test (26) and a parabolic reflective surface (32) for translationally positioning the lens under test (26). According to this configuration, the lens holder (14) is translationally positioned using the parabolic reflective surface (32) to reflect radiation to a focal point (24) along the hologram (22). The hologram (22) returns the radiation to the parabolic reflective surface (32) which reflects it back to the interferometer (12) at a precise distance and position using normal interferometric techniques. The lens under test (26) is rotationally positioned by pivoting the lens holder (14), both in tip and in tilt, so that the flat reflective surface (34) is nulled to the interferometer (12). Thereafter, the lens holder (14) is correctly positioned relative to the hologram (22) and interferometer (12) so that when the lens under test (26) is seated on the lens holder (14), its aspherical shape can be tested.

REFERENCES:
patent: 3507597 (1970-04-01), Brockway et al.
patent: 3740150 (1973-06-01), Munnerlyn
patent: 5666198 (1997-09-01), Stenton
patent: 5684593 (1997-11-01), Stenton

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