SU734831A1 - Device for control of electron-optical gate - Google Patents

Description

one

The invention relates to a technique for controlling electron-optical gates used in observing high-speed light-emitting processes.

A device for controlling an electron-optical gate is known, in which the supply voltage is successively applied to both gate electrodes. The device contains a power source connected through resistors to the gate electrodes connected to the outputs of two delay lines, the inputs of which through key elements are connected to the common electrode of the power source 1.

The specified device does not have sufficient reliability, accuracy and. stability control.

The closest technical solution to the proposed one is an electronic-optical gate control device comprising a series-connected power source, a key element and a delay line, the output of which is connected to the gate electrode and the matched load 2.

This device also does not provide sufficiently reliable control.

In order to increase the reliability of control, resistors, a capacitor, and an additional key element are inserted into the device, the second gate electrode being connected to the input of the delay line through a capacitor connected in series and an additional key element to the power supply, and the second resistor shunt the gate.

FIG. 1 shows a block diagram of the proposed device, FIG. 2 - the equivalent circuit of the device in a constant mode of operation; in fig. 3 - the equivalent circuit of the device in a pulsed mode of operation.

The device for controlling the optical gate 1 contains resistors 2 and 3, a capacitor 4, a delay line 5, key elements 6 and 7, a matched load 8 and a power source 9. One of the gate electrodes 1 through a series-connected resistor 2 and a key element 6, as well as through the capacitor 4 and the key element 7 is connected to the output of the power source 9. The output of the key element 7 through the delay line 5 is connected to another gate electrode 1 and matched

load 8, and the gate 1 is shunted by a resistor 3.

The device is used in two modes, constant and pulsed.

In the constant mode with the key element 6, the voltage of the power source 9 through the resistor 2 is applied to one of the gate electrodes 1, resistor 3 and capacitor 4, which through negligible resistance of delay line 5 and matched load 8 (compared to resistors 2 and 3) is charged to a potential difference equal to the voltage drop across the resistor 3, serves as a capacitive filter. In this mode, the supply voltage, equal to the voltage drop across the resistor 3, is constantly applied to the gate 1, the gate is open, and the instrument is adjusted.

In the pulse mode, through the key element 7, the voltage of the power source 9 is applied to the input of the delay line 5 and through the capacitor 4 to one of the gate electrodes 1. A potential difference arises between the gate electrodes and the gate opens.

The voltage front formed by the key element 7 propagates along the delay line 5 at a final speed and after some time reaches the second gate electrode 1 and the matched load 8. In this case, the potential of the second gate electrode is compared with the potential of the first electrode, the potential difference disappears between the electrodes, the shutter is locked. The exposure time of the shutter is equal to the time of movement of the voltage front along delay line 5. By adjusting the delay time of the delay line 5, adjust the exposure time of shutter 1.

The proposed device allows to increase the accuracy and stability of control. The device has smaller dimensions than the known ones, due to the reduction of the number of the most cumbersome elements of the delay lines, it can operate in constant and pulsed modes, it is technically easy to perform. In addition, the shutter is automatically prevented from overloading in a pulsed mode of operation, since the full charge flowing through the shutter cannot

exceed the amount of charge accumulated on the capacitor.

Claims (2)

1. US patent number 3423595, class. 250-213, publ. 1969. 2.N. Baechi, J. Denis. Electronique associee a des equipments photographic ultravapide. Acta electronica. 1972, 15, No. 4, 317327, (prototype). FIG. I FIG. 2