Holographic shearing interferometer

Details Holographic shearing interferometer Holographic shearing interferometer

1976-11-23

1978-10-03

Clark, Conrad J.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356111, 350 373, G01B 902

Patent

active

041181247

ABSTRACT:
The sheared interference fringe of a wavefront from an object under test is obtained by recording on a first hologram the interference fringe formed between a first reference light beam and two light beams having slightly different angles of incidence with respect to the first hologram, recording on a second hologram the interference fringe formed between a second reference light beam and the two light beams reconstructed by an illuminating light beam incident on the first hologram from the same direction as the first reference light beam, placing the first and second holograms thus obtained at a prescribed distance from each other, causing a light beam from the object under test to impinge upon the first hologram from the same direction as the first reference light beam to produce light beams and projecting the produced light beams upon the second hologram for thereby causing the second hologram to produce light beams in the same direction as the second reference light beam.

REFERENCES:
patent: 3468609 (1969-09-01), Sterrett
patent: 3532431 (1970-10-01), Bryngdahl
patent: 3572934 (1971-03-01), Bryngdahl
patent: 3923400 (1975-12-01), Hardy

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