Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
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.
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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.
Clohan Paul S.
Harris Charles H.
Krosnick Freda L.
The United States of America as represented by the Secretary of
Turner Samuel A.
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