Method and apparatus for producing an intensity contrast image f

Details Method and apparatus for producing an intensity contrast image f Method and apparatus for producing an intensity contrast image f

1995-08-14

1998-06-02

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

359 7, G01B 9021

Patent

active

057609020

ABSTRACT:
A method and apparatus for producing images in which phase variation introduced by reflections from a transparent phase object are represented in interference generated phase contrast, and in which gradients in phase introduced by transmission through the phase modulating object or plate are represented in phase gradient contrast. Combination interference generated phase contrast-phase gradient contrast images are also produced. A laser beam is directed by a beam splitter through the transparent phase and falls onto a photorefractive crystal where a temporary hologram forms. The hologram generates the phase conjugate of the transmitted beam which moves back through the plate, so the phase distortions introduced by the transparent phase object are removed in the back propagating beam. This beam interferes with a specularly reflected beam from the transparent phase object. The change in the interference pattern when the object is displaced in the beam direction yields an interference generated phase contrast image of the phase shifts introduced by reflection from the plate. An image of gradients in phase introduced by the plate or other phase object can be also produced by shifting the object in the lateral direction. Images before displacement and after displacement are digitally acquired and subtracted to produce images of the introduced phase in interference generated phase contrast; in phase gradient contrast; and combined axial and lateral shifts in combined interference generated phase contrast, phase gradient contrast. The digital images are displayed on a video monitor.

REFERENCES:
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patent: 4921333 (1990-05-01), Brody et al.
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patent: 5235400 (1993-08-01), Terasawa et al.
Phase-Conjugate Fizeau Interferometer, Daniel J. Gautheir and Robert W. B, Robert K. Jungquist, Jerold B. Lission and Lyon Voci; Mar. 15, 1989, vol. 14 No. 6, Optics Letters.

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