Apparatus to measure wedge and centering error in optical elemen

Details Apparatus to measure wedge and centering error in optical elemen Apparatus to measure wedge and centering error in optical elemen

1997-05-27

1998-11-10

Font, Frank G.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356125, 356127, G01B 900

Patent

active

058352082

ABSTRACT:
The present invention provides a measuring apparatus (10) for centering and determining wedge error of an optical element (12) under test. The measuring apparatus (10) preferably includes a lens holder (16) for supporting the optical element (12) to be tested. The lens holder (16) is rotatably supported on an air bearing (68) having an axis such that the lens holder (16) may be rotated about the axis. A first sensor (18) is located proximate the lens holder (16) for measuring the wedge characteristics of the optical element (12). The first sensor (18) is movable in a horizontal, vertical and rotatable direction such that the first sensor (18) may be positioned to a predetermined distance from the optical element (12) at a preselected angle. A second sensor (20) is located proximate the lens holder (16) for measuring centering characteristics of the optical element (12). The second sensor (20) is movable in a horizontal and vertical direction such that the second sensor (20) may be positioned to a predetermined distance from the optical element (12). A manipulating member (52) coupled to the second sensor (20) is utilized for centering the optical element (12) relative to the lens holder (16). According to the invention, a theoretical sine wave curve is used to center the lens (12) on the lens holder (16) prior to measuring wedge error. Any holder error is removed from the measurement data by introducing a phase shift to the testing sequence.

REFERENCES:
patent: 4601575 (1986-07-01), Tamaki
patent: 4925301 (1990-05-01), Rafanelli

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