SU813533A1 - Optronic converter - Google Patents

Description

I

The invention relates to the registration of fast processes, in particular, to electron-optical image converters (EOC).

An EOC is known, containing a translucent photocathode, a focusing electrode in the form of a truncated cone, an anode diaphragm, an electronic shutter in the form of two pairs of deflecting plates separated by a stopper diaphragm, a sweep system in the form of deflecting plates and a fluorescent screen 1.

The disadvantage of this EOC is the low temporal resolution (about 10 10 s due to the low voltage of the electric field in the cathode region. This deficiency does not allow using this device in the picosecond range of detected radiations.

An image converter tube containing a translucent photocathode, an accelerating electrode with a grid, a focusing electrode, an anode diaphragm, an electronic shutter in the form of two pairs of deflecting plates with a diaphragm, an image scanning system in the form of deflecting plates, and a fluorescent screen 2 are also known.

However, the presence of an electrode with an accelerating grid near the photocathode makes it impossible to manufacture a photocathode inside the device, therefore the photocathode is transferred to this image tube by the manipulator method. This leads to a loss of sensitivity of the image intensifier in the visible range by about 20% and in the infrared range (at a wavelength of about 1 micron) - several times.

The purpose of the invention is to increase the sensitivity of EOC.

This goal is achieved by the fact that, in the proposed EOC, the accelerating electrode is made up of two elements, one of which is a cylinder outside of which a ring is mounted so that it can move along the side surface of the said cylinder, while on the side surface there are fixed springs .x removal outside the cylinder, inside of which is located the second element of the accelerating electrode, also made in the form of a cylinder with a fine mesh, with the possibility of moving it an inner side surface of the first guide cylinder accelerates

the electrode and its fixation in the operating state in the device flask relative to the photocathode and the luminescent screen with the fixing springs of the first element of the accelerating electrode.

FIG. 1 shows the proposed EOC before the production of the photocathode; in fig. 2 - after manufacture.

The proposed EOC contains a translucent photocathode 1, an accelerating electrode consisting of a cylinder 2, an outer ring 3, fixing springs 4 (only one spring is shown in Fig.) And a cylinder 5 with a fine mesh 6, a focusing electrode 7, an anode diaphragm 8, an electronic a shutter consisting of two pairs of deflecting plates 9 and 10, between which a shutter diaphragm 11 is installed, an image scanning system 12 and a screen 13.

The manufacture of the photocathode inside the Osuts1 device is as follows.

Pre-cylinder 5 with mesh 6 is installed in the far right side of cylinder 2 (Fig. 1). The locking springs 4 are removed outside the cylinder 2 and in this state are held by the outer ring 3. The photocathode is produced by inserting through the dowels, through the hole in the cylinder 2 inside the device, the weights of the corresponding elements and spraying them on the cathode glass of the image intensifier. After the photocathode has been fabricated, the EOP turns the photocathode downward, as a result of which the cylinder 5 with the grid 6 moves in the direction of the photocathode, hits the ring 3, which releases the fixing springs 4. The fixing springs, moving the cylinder 5 into the cylinder 2, press the cylinder 5 with the grid 6 to the end surface of cylinder 2, with the result that the grid 6 is fixed at a fixed distance from the surface of the photocathode (Fig. 2).

As shown by tests of prototype EOPs made according to the invention, the sensitivity of EOPs in the visible range of the spectrum increased by an average of 20-25 / o and in the range of infrared radiation (at a wavelength of 1 µm) - by a factor of 2-3.

Claims (2)

1.Butslov M.M. Electron-optical converters for studying ultrafast processes. “Advances in scientific photography, 1959, No. 6, p. 76. 2.Butslov M.M. and Stepanov B.M. Pulsed electron-optical light amplifiers for the study of nanosecond and picosecond light processes. "Magazine scientific and applied photography and cinematography. V. 20, 1975, no. 3, s. 198, USSR Academy of Sciences (prototype). 57 89 10 g //// II one J3 gr | , / 1 77 J2 10 12 8 9 1L iUi / J fig.g / 7