Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1984-03-01
1987-04-21
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313528, 313533, H01J 3150
Patent
active
046599215
ABSTRACT:
A light detector which can be gated on and off over an ultrashort time window, such as in picoseconds or femtoseconds, is disclosed. The light detector includes, in one embodiment, an input slit for receiving a light signal, relay optics, a sweep generator and a tubular housing, the tubular housing having therein a photocathode, an accelerating mesh, a pair of sweeping electrodes, a microchannel plate, a variable aperture and a dynode chain. Light received at the input slit is imaged by the relay optics onto the photocathode. Electrons emitted by the photocathode are conducted by the accelerating mesh to the sweeping electrodes where they are swept transversely across the tubular housing at a rate defined by the sweep generator over an angular distance defined by the sweeping electrodes, in a similar manner as in a streak camera. Swept electrons strike the microchannel plate where electron multiplication is accomplished. Exiting electrons which pass through the variable aperture and which strike the first dynode (cathode) in the dynode chain are further multiplied and outputted from the last dynode anode in the dynode chain as an analog electrical signal, the analog electrical signal corresponding to the intensity of the light signal during the time window over which swept electrons are picked up by the first dynode. In another embodiment of the invention all of the dynodes in the chain except for the last dynode are replaced by a second microchannel plate.
REFERENCES:
patent: 3885178 (1975-05-01), Goehner
patent: 4467189 (1984-08-01), Tsuchiya
Kriegsman Irving M.
Westin Edward P.
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