Optics: measuring and testing – For light transmission or absorption
Patent
1995-08-01
1997-08-26
McGraw, Vincent P.
Optics: measuring and testing
For light transmission or absorption
359235, 359236, G01N 2159
Patent
active
056615620
ABSTRACT:
A tomographic imaging system works with a conventional real image formed by, e.g., a lens. Scanning is over an image formation area of the image plane. A plurality of differently-oriented scanning apertures are disposed over the surface of a spinning element (disk or rotor drum). A detector is located behind the image plane for creating a signal proportional to light passing through the scanning apertures, which sweep over the image. The apertures are swept through the image plane in a first direction by the spinning of the disk or drum; they are simultaneously swept in a second direction, also lying in the image plane, that is perpendicular to the first direction, by appropriate mechanical mechanism. The simultaneous sweeps allow signal processing means to reconstruct from the detector signal a scanned image by using conventional tomographic algorithms. The device may include a variable-diameter aperture and means for moving the aperture over the image formation area; this acts as a "zoom".
REFERENCES:
patent: 1842759 (1932-01-01), Malm
patent: 3002098 (1961-09-01), Watkins
patent: 3526774 (1970-09-01), Alden
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