Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1984-03-01
1987-07-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313537, H01J 3150
Patent
active
046820205
ABSTRACT:
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.
REFERENCES:
patent: 3969699 (1976-07-01), McGlaughlin
patent: 4069418 (1978-01-01), Merkelo
patent: 4272782 (1981-06-01), Proper et al.
patent: 4352127 (1982-09-01), Tsuchiya
patent: 4413178 (1983-11-01), Mourou et al.
patent: 4437763 (1984-03-01), Kaye
Kriegsman Irving M.
Nelms David C.
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