Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-06-16
1977-05-10
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250445T, 356167, H01J 3912, G01N 2304
Patent
active
040230368
ABSTRACT:
An apparatus and method for generating a two-dimensional back-projected image of a slice of an object. In accordance with the invention there is provided a carrier means having a plurality of substantially parallel elongated projections thereon, each projection having an optical characteristic (transmissivity or reflectivity) representing the density characteristic of said slice of the object as measured at a particular relative rotational angle. Means are provided for imaging successive sinusoidal patterns on the carrier means, the successive sinusoidal patterns being imaged at a predetermined rate. Photodetector means are responsive to the imaged sinusoidal patterns. Finally, a display or recording means, synchronized at the predetermined rate, is responsive to the output of the photodetector for displaying the back-projected image. In a preferred embodiment of the invention the carrier means is a cylindrical film having projections thereon with transmissivities that represent the density characteristic of the slice of the object under consideration. In this embodiment, means are provided for uniformly illuminating the projections and optical mask means are provided in spaced relation to the cylindrical film and operative to image portions of the projections on the cylindrical film. Means are provided for rotating the cylindrical film on its axis so that the mask means continuously images different groups of projections on the film. Means are also provided for effecting relative angular motion between the mask means and the axis of the cylindrical film, whereby the mask means continuously images varying portions of the cylindrical film, the variation being along the axial direction thereof. In this embodiment the display means is synchronized with the rotational rate of the cylindrical film and with the effective angular displacement rate between the mask means and the axis of the cylindrical film.
REFERENCES:
patent: 3483557 (1969-12-01), Skenderhoff et al.
patent: 3621222 (1971-11-01), Minami
patent: 3642350 (1972-02-01), Hirsch et al.
patent: 3706881 (1972-12-01), Emshwiller
patent: 3882482 (1975-05-01), Green et al.
Barrett Harrison H.
Gordon Scott
Moore David K.
Novack Martin
Smith Alfred E.
University Patents Inc.
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