Foucault method for testing an optical surface

Details Foucault method for testing an optical surface Foucault method for testing an optical surface

1990-01-12

1992-10-13

Evans, F. L.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

359227, G01B 900

Patent

active

051555441

ABSTRACT:
The Foucault or knife-edge method may be employed for testing an optical surface defined by an imaging device, for example, a mirror surface, to ascertain its characteristics, for example, whether or not it is a source of optical aberrations. To this end, the traditional Foucault knife-edge method typically employs a knife-edge that comprises a metal razor blade. The present method, in contrast, provides an improved Foucault method, and features a novel optical element suitable for employment in the method. The optical element comprises a transparent substrate, and a coating material that can adhere to at least a portion of the transparent substrate, thereby forming at least one knife-edge pattern.

REFERENCES:
patent: 4812039 (1989-03-01), Shimada et al.

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