SU400064A1 - IMPULSE source of ROCKED SPECTRUM - Google Patents

Description

one

The invention relates to the field of optical ismerenin and is intended, in particular, for spectroscopic studies of high-speed processes.

Prn.menenne as sources of the line spectrum in the near infrared region of intense pulsed lamps, which are mainly xenon-filled at a sufficiently high pressure, is very difficult due to the presence of very strong continuous background.

The purpose of the invention is to create a source having an intense line spectrum in the near liK region.

This is achieved by the fact that in a device containing a PRK mercury lamp, fed from a pilot arc source, and a capacitor discharged to the lamp through a controlled switch to provide an impulse subband, the capacitance value of the Bbi6paiia capacitor is such that the ratio of the inductance of the discharge gap of the lamp to the capacitor the capacitor did not exceed 0.4 g / f when the voltage across the capacitor does not exceed 500 volts.

In order to ensure the stable operation of the nstochik, a phasing transformer is introduced into it, the primary winding of which is connected to the source of the pilot arc, and the secondary

Winding is connected to the managed switch.

The introduction of a phasing transformer ensures that the conditions are energized. This is where the systronization of the supply of the impulse pulse with a certain ammount and the phase of the alternating current applied to the lamina is important.

FIG. I shows the noluprnnipialnaya scheme of the arrangement of the nmnusor subpatka, where 1 is the discharge circuit and the discharge circuit of the storage capacitor, 2 is the switch, 3 is the source of the standby arc.

The charge circuit of the capacitor 4 with a capacitance, nanrid; ep, 50-100 micron consists of a ballast sonrogation of a 5 n direct current source 6.

The discharge of capacitor 4 consists of a gas discharge gap 7 and a fuse of contacts 8.

Com: A 1utator consists of a phasing trans (a juermator 9, a unit 10 for forming rectangular impulses that control the operation of a thyratron 11, the discharge coil of which is connected to the relay coil 12, which is triggered by the bottom 13.

The operation of the source is as follows.

When coinciding in time with the impulse of the negative half-wave voltage coming from the secondary winding of the transformer 9, a rectangular pulse is removed from the unit and fed to the grid of the thyratron 11.

When the thyratron is ignited, relay 12 is activated and its contacts 8 close the discharge circuit. Precharged to a voltage of 600-800, the storage capacitor 4 begins to discharge through the burning gap of the mercury lamp. After 20-10 ® sec, the discharge current reaches a maximum value, the value of which is 50 times or more than the current in the continuous mode of the lamp. When the discharge current through the thyratron disappears, the relay contacts open and the effect of the pulse replenishment on the lamp ceases.

To extinguish the contacts at the moment of opening, the winding of the relay is shunted by a diode 13. A significant increase in the current flowing through the lamp at the time of the pulsed feed leads to the excitation of an intense line spectrum in the near IR region.

FIG. Figure 2 shows the spectrum of the PRK lamp in pulsed power mode.

Deciphering the spectrum showed that, in the near-IR region, it mainly belongs to argon, which is filled with a PRK lamp to facilitate ignition. The initial pressure of argon is 40 mmHg. Art. A similar spectrum is recorded in the case that an unlit lamp is excited with the aid of the discharge circuit indicated above. The source is easy to manufacture and provides a stable pattern of emission of spectral lines in the near PC region. It is especially advisable to use such a source if the receiver is an EOC having a multi-alkaline or kilo-cesium photocathode, since the region of the location of the spectral lines

argon is in good agreement with the spectral characteristics of these photocathodes.

Subject invention

A pulsed line spectrum source containing an immobile mercury-quartz lamp fed from a source of an arc, using argon as a buffer gas and a capacitor discharged through a controlled switch to the discharge gap of the lamp to provide a pulsed recharge, characterized in that ensuring its stable operation, expanding the spectral composition of the radiation in the near infrared region and increasing the intensity of the radiation of the spectral lines under the voltage of an impulse feed, do not exceed 500 lev els in the ratio of inductance to discharge gap capacitance is not more than 0.4 H / f, and the controlled switch connected to the source of the pilot arc through the phasing transformer. Чg 57 70 Hq57SU. 596ff Ar7067 ftr / UO U. -J a. I f j-L riTTT 3, Ar8668 NG OOOO, ZZ Hg W1W f-ig. 2 b