Sweep drive circuit for a streak camera

Details Sweep drive circuit for a streak camera Sweep drive circuit for a streak camera

1981-03-23

1983-11-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313537, H01J 3150

Patent

active

044131780

ABSTRACT:
An inexpensive, simple and highly accurate sweep drive circuit for streak cameras generates a ramp voltage for the deflection plates of an image converter tube of a streak camera. A solid state switch is used in a manner which eliminates the need for a pulsed multi-kilovolt bias voltage and the use of cryogenics. High voltage direct current in the multi-kilovolt range is applied to a charged circuit which may include a high voltage capacitor or use the capacitance presented by the deflection plates of the tube. The switch is laser activated and becomes photo-conducting. The charge in the capacitor passes through a charging resistor which controls the sweep rate to the deflection plates. After the activating laser pulse, the switch returns rapidly to a nonconducting state, during the recombination time of the switch material. The photo-electron beam is swept linearly over a substantial portion of the recombination time from off the image forming phosphor screen to off screen on the other side thereof. A resistor connected to the deflection plates provides a time constant long compared to the transient event lifetime, which may be the fluorescence decay time of the system under study, and the beam remains off the phosphor screen for a very large time compared to the fluorescence decay time. In a second configuration when the deflection plates are used as the charged source, the laser-activated switch is connected between a deflection plate and a point of reference potential (ground) through the charging resistor.

REFERENCES:
patent: 4282427 (1981-08-01), Brjukhnevich et al.
patent: 4327285 (1982-04-01), Bradley

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