Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1993-08-02
1995-06-27
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
356349, 356432, G01N 2127
Patent
active
054284473
ABSTRACT:
A laser beam, which has been formed into the shape of a conical beam, is irradiated to a sample and is displaced with respect to the sample such that the laser beam may helically scan the sample. The laser beam having passed through the sample to the same direction as the direction, along which the laser beam impinging upon the sample propagates conically, is selected from the laser beam, which has scanned the sample and which has been radiated out of the sample, by using an image forming lens and a pinhole. A two-dimensional intensity distribution of the laser beam, which has passed through the sample and which has been selected, is detected. Three-dimensional information representing the form and/or structure of the sample is then obtained from the detected two-dimensional intensity distribution by using a computed tomography technique. Three-dimensional information of a sample containing a light scattering medium is thereby obtained accurately.
REFERENCES:
patent: 4386854 (1983-06-01), Byer
"Three-Dimensional Helical-Scan Computer Tomography Using Cone-Beam Projections" in Symposium of the Institute of Electronics and Communication Engineers of Japan, D-III, vol. J75-D-II, 1708, 8 Aug. 1991.
"Optical CT Microscope and Three-Dimensional Observation" Optical Technology Contact vol. 28, No. 11, 1990.
Applied Optics, vol. 31, No. 5, Feb. 10, 1992, pp. 670-674, Noda et al.: "Three Dimensional Phase Contrast, Etc.".
Applied Optics, vol. 30, No. 28, Oct. 1, 1991, pp. 4148-4153, Milbocker et al.: "Comparison Of Three Dimensional Retinal Imaging, Etc."
Electronics & Communications In Japan II: Electronics, vol. 75, No. 4, Apr. 1, 1992, New York, pp. 1-16 XP312129, Toida et al.: "Optical Computed Tomograph, Etc."
Applied Optics, vol. 23, No. 16, Aug. 15, 1984, pp. 2678-2685, Bennett et al.: "Experimental Optical Fan Beam Tomography".
Optics Letters, vol. 16, No. 16, Aug. 15, 1991, pp. 1280-1282, Beiting: "Fast Optical Absorption Tomography."
Fuji Photo Film Co. , Ltd.
Rosenberger Richard A.
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