An improved image dissector camera tube system for improving the signal-to-noise ratio in which the aperture plate of the image dissector has a plurality of apertures, the apertures individually biased by an electronic control network to accomplish a Hadamard encoding of the electron image.
A light detector which can be gated on and off in picoseconds is disclosed. The light detector includes a photomultiplier tube and a streak camera, the streak camera having a picosecond sweep time and being disposed so as to serve as a gate for the input to the photomultiplier tube. In operation, light received by the streak camera is converted into a streak image which is formed on the phosphor screen of the streak camera tube, the streak image corresponding to the intensity of light received by the streak camera during the time window of the sweep. Relay optics at the output end of the streak camera images the streak image onto the photocathode of the photomultiplier tube. The input end of the streak camera includes a two lens relay lens system. A variable aperture located between the phosphor screen and the output relay optics limits the portion of the streak image that is collected by the output relay optics and actually imaged onto the photomultiplier tube and hence the portion of the time window during which the photomultiplier tube receives light from the streak camera. A varible delay unit coupled to input of the streak camera enables the time window to be selectively shifted.
The device operates after the principle of an intensity interferometer. It contains a plurality of detectors arranged two-dimensionally in fixed relative positions. The signals from the detectors are correlated in pairs. A pattern formed from the correlation values is compared with patterns of the same kind from known objects.
A system utilizing uniformly redundant arrays to image non-focusable radiation. The uniformly redundant array is used in conjunction with a balanced correlation technique to provide a system with no artifacts such that virtually limitless signal-to-noise ratio is obtained with high transmission characteristics. Additionally, the array is mosaicked to reduce required detector size over conventional array detectors.
4360797 - Coded aperture imaging with uniformly redundant arrays - Owned by The United States of America as represented by the United States (Washington, DC) [*] Notice:The portion of the term of this patent subsequent to June 24, 1997 has been disclaimed.
A system utilizing uniformly redundant arrays to image non-focusable radiation. The uniformly redundant array is used in conjunction with a balanced correlation technique to provide a system with no artifacts such that virtually limitless signal-to-noise ratio is obtained with high transmission characteristics. Additionally, the array is mosaicked to reduce required detector size over conventional array detectors.
