Interferometric system

Details Interferometric system Interferometric system

1979-12-26

1982-08-31

Corbin, John K.

Optics: measuring and testing

By polarized light examination

With birefringent element

G01B 1100

Patent

active

043470009

ABSTRACT:
An interferometric system for testing a lens comprises a source of light and a beam splitter in the path of the light divides the light into first and second beams. A device is provided for holding the lens to be tested in the first beam. A reflector is disposed in the path of the first beam beyond the lens for reflecting the first beam to the beam splitter. A movable reflector is provided in the path of the second beam for reflecting the second beam to the beam splitter to form a single recombined beam. The movable reflector is displaceable in translation along the axis of the beam it reflects and in rotation about an axis or orthogonal axes in the plane of the movable reflector and perpendicular to the beam axis. The entire recombined beam impinges on a photoelectric detector which, in response thereto, generates an electrical signal representing the complex point spread function of the lens being tested.

REFERENCES:
patent: 3767307 (1973-10-01), Bowker

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