Holographic shearing interference contrast method and interferom

Details Holographic shearing interference contrast method and interferom Holographic shearing interference contrast method and interferom

1978-08-09

1981-06-09

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

350 373, 356353, G01B 902, G01B 9021, G02B 532

Patent

active

042721920

ABSTRACT:
A transparent object can be converted into a visible image which is made up of a contrasted image of light and shade and therefore is readily perceivable with a three-dimensional illusion sensation by a method which comprises forming holograms with each of two collimated beams having slightly different angles of incidence and one reference beam, causing the reference beam to impinge upon the first hologram and thereby reproducing first order diffraction beams equivalent to the two collimated beams, then causing the reproduced diffraction beams to be passed through or reflected by the transparent object so as to impinge upon the second hologram and thereby reproducing diffraction beams laterally sheared and equivalent to the reference beam by which the second hologram was formed and imparting a suitable phase difference to these reproduced diffraction beams and thereby causing the beams to interfere with each other, whereby the phenomenon of interference thus produced on the surface of the object image gives rise to the visible image for desired observation.

REFERENCES:
patent: 3532431 (1970-10-01), Bryngdahl
patent: 3572934 (1971-03-01), Bryngdahl
patent: 3701579 (1972-10-01), Zollner
patent: 4118124 (1978-10-01), Matsuda

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