Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1983-03-07
1986-01-14
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
250237G, G01B 1124, G01B 1504
Patent
active
045642958
ABSTRACT:
The disclosure is directed to an apparatus and method for obtaining an improved moire fringe pattern image of an object. A beam of incoherent light is projected at the object. A grating is disposed in the path of the beam projected at the object, this grating being referred to as a projection grating. Means are provided for focusing the beam reflected from the object to obtain an image at an image plane. Another movable grating is disposed at the image plane. This movable grating is referred to as a reference grating. Means are provided for recording the image at the image plane, the recording means being, for example, a photographic or video camera. In accordance with an important feature of the invention, means are provided for moving the projection grating and the reference grating in synchronism. In a preferred embodiment, the projection and reference gratings are mounted in spaced relation in a movable member, and the synchronized motion of the gratings is implemented by moving the member. In a form of the disclosure, a double-projection set-up is used wherein two projection beams are directed at the object through first and second movable projection gratings, respectively. In this embodiment, the first and second projection gratings are moved in synchronism with the reference grating. This is preferably achieved by mounting the three gratings in appropriate spaced relationship in a common member, and moving the member.
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patent: 4132575 (1979-01-01), Suzuki et al.
Cline et al., "Computer Aided Surface Reconstruction of Interference Contours", Applied Optics, vol. 21, No. 24, 12/15/82, pp. 4481-4487.
Meadows et al., "Generation of Surface Contours by Moire Patterns", Applied Optics, vol. 9, No. 4, Apr. 1970, pp. 942-947.
Wasowski, "Moire Topographic Maps", Optical Communications, vol. 2, No. 7, Dec. 1970, pp. 321-323.
Allen et al., "Removal of Unwanted Patterns from Moire Contour Maps by Grid Translation Techniques", Applied Optics, vol. 10, No. 1, pp. 210-212, Jan. 1971.
Xenofos et al., "Evaluation of Moire Imaging System", Phys. Med. Biol., vol. 24, No. 2, 1979, pp. 262-270.
New York Institute of Technology
Novack Martin M.
Rosenberger R. A.
Vollero Michael
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