Phase shifting device

Details Phase shifting device Phase shifting device

1994-09-22

1995-11-28

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237G, G01B 1124

Patent

active

054713080

ABSTRACT:
The invention provides a device for shifting the phase of a projected grating by use of a plurality of transparent plates, each disposed at a different angle with respect to the angle of the grate, which plates may be selectively placed between the grating and the projecting lens of a projecting system to modulate, that is, to shift, the phase of the projection of the grating on a test surface.

REFERENCES:
patent: 4984893 (1991-01-01), Lange

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