Optical: systems and elements – Holographic system or element – For reconstructing image
Patent
1996-08-30
1998-09-08
Henry, Jon W.
Optical: systems and elements
Holographic system or element
For reconstructing image
359 1, 359 10, 359 32, 348 40, G03H 122
Patent
active
058053166
ABSTRACT:
The twin-image elimination apparatus of the present invention comprises (a) a scanning light source for emitting a scanning light beam; (b) an interference device which converts the scanning light beam from the scanning light source into a spherical wave and a plane wave having temporal frequencies different from each other and combines the spherical and plane waves together; (c) a scanner for scanning an object with the combined light beam from the interference device; (d) a photodetector for detecting a scattered wave from the object; (e) a first multiplier which converts an output signal of the photodetector into a cosine-coded holographic information; (f) a second multiplier which converts the output signal of the photodetector into a sine-coded holographic information; and (g) a holographic reconstruction device which converts output signals of the first and second multipliers into a sum signal, in which these output signals are added together with a phase difference of .pi./2+2n.pi. (wherein n is an integer not less than 0), so as to reproduce an image of the object without the presence of its twin image. Hence, at the time of reconstructing a hologram, the virtual image component contained in the output signal of the photodetector can be removed, thereby improving the image quality of the reconstructed image.
REFERENCES:
patent: 3856986 (1974-12-01), Macovski
patent: 4376950 (1983-03-01), Brown et al.
patent: 5064257 (1991-11-01), Shinoda et al.
Poon et al: "Three-dimensional microscopy by optical scanning holography", Optical Engineering, May 1995, vol. 34, No. 5, pp. 1338-1344.
Poon Ting-Chung
Shinoda Kazunori
Suzuki Yoshiji
Wu Ming Hsien
Hamamatsu Photonics K.K.
Henry Jon W.
Schuberg Darren E.
Virginia Tech Intellectual Properties Inc.
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