SU479177A2 - Gas dynamic light source - Google Patents

Description

It is located on the wall of the indicated chamber to a mirror, the reflecting surface of which is perpendicular to the longitudinal axis of the tube.

The obstacle-carrying tube, which also plays the role of a channel for transmitting radiation, adjoins the flask at the end of the cylindrical process remote from the discharge chamber using an intermediate metal element that simultaneously seals the flask and carries a slit diaphragm located parallel to the mirror and an optically transparent barrier.

The optically transparent barrier, which acts as a window for the radiation to exit, can be made in the form of a hollow cone with a longitudinal axis, perpendicular to the mirror, and with an apex angle of 140 °.

FIG. Figures 1 and 2 show the proposed gas-dynamic light source (two versions), a side view with a partial section.

The gas-dynamic discharge light source with an end radiation output contains a working gas, for example xenon, filled to a pressure of 2-100 Torr ((Mostly 10-50 Torr) discharge chamber 1 with means for electromagnetic acceleration of the gas-discharge plasma generated in it, are a metal bus 2 mounted on the dielectric wall 3 and included in the discharge circuit with the direction of the electric current opposite to the direction of the current in the specified chamber. The cylindrical process of the bulb (chamber Expansion 4) is associated with it through a cone junction 5 (Fig. 2) or is made as one with it.

In the discharge chamber 1, perpendicular to the longitudinal axis of the expansion chamber (process of the T-shaped tube), legs 6 and 7 are mounted, in which vacuum-tightly assembled with coinciding longitudinal axis electrode nodes 8 and 9 with flat working electrodes 10 of thoriated tungsten located at the level of This space. The end wall 11 of the discharge chamber is made flat and is externally covered with a reflectively reflective radiation layer 12 based on silver, aluminum or other material for the case when camera 1 is made of optically transparent quartz glass. The flat specularly reflecting radiation wall 11 of the discharge chamber is oriented perpendicular to the longitudinal axis of the expansion chamber 4, in which a glass or ceramic tube 13 is placed coaxially, which serves to axially transmit the radiation and at the same time carrying an optically transparent flat barrier 14 (Fig. 1) or a conical barrier 15 (Fig. 2). The barrier is made of fused silica glass or other suitable material that transmits radiation in the optical wavelength range of the spectrum. The optically transparent cone barrier 15 is made in

the shape of a hollow cone with an apex angle of 140, selected on the basis of a deliberately correct reflection when oriented by its converging part to the discharge chamber. In this case, the longitudinal axis of the cone barrier must coincide with the direction of the force vector accelerating the plasma and shock waves, which, in normal reflection, the latter for speeds exceeding 2 km / s should

to provide an increase in the temperature behind the reflected wave by more than 1.5 times as compared with the reflection from a flat obstacle.

The cone as well as the flat barrier is mounted on the front part of the carrier

tube 13 and is located near the discharge chamber parallel to its flat specularly reflecting wall AND at a distance of 20-50 mm from the axis of the discharge gap. Geometrical dimensions of the barrier in the form-washer

or a cone selected within 4-8 mm in diameter, i.e., such that its braking area is at least / 4 of the internal cross-sectional area of the expansion chamber with a diameter of up to 20 mm. In this case, between the outer walls and the barrier-carrying tube 13 and the expansion chamber 4, an annular ballast volume is formed, which must be not less than the value of the volume of the discharge chamber.

When a light source (Fig. 2) is performed with a tapered transition 5 of the discharge chamber 1 into the expansion chamber 4, the obstacle is located almost in the transition zone of the tapered part into the cylindrical part of chamber 4. To increase the service life of the source when operating in the mode of short high-current bits of the obstacle the tube 13 is mechanically and vacuum-tightly connected to the expansion chamber 4 at the end distant from the discharge.

by means of an intermediate metal cup 16 made of titanium or covara, the side walls of which form annular gaps 17 and 18, respectively, with the walls of the tube and chamber, which are filled in the tin-titanium alloy sealing process. To eliminate the effect of radiation of a shock-heated gas on the sealing zone of the carrier tube of tube 13 and cup 16, a screening sleeve 19 made of aluminum or other light-reflecting material is applied, screwed onto the axially protruding part of said cup before final sealing of expansion chamber 4 in the zone of annular gap 17. Intermediate metal cup

16, sealing the expansion chamber and mechanically strengthening the carrier tube and the barrier therein, is at the same time the holder of the diaphragm 20 with a diameter of 4-6 mm, made in its central part. To highlight

In the central part of the luminescence body of a rectangular platform with a size of 2x3 mm or other sizes with a constant energy brightness, a removable slit diaphragm can be used (not shown),

screwed onto metal - glass 16

on the thread 21, made on its side surface.

The discharge chamber and the bulb appendix can be covered with a reflective layer, for example, based on sintered silicon dioxide and / or enclosed in a metal jacket 22 (Fig. 2), for example, from aluminum with reflective internal walls, provided on the front part with a slit diaphragm 20 to pass the radiation.

The described gas-dynamic light source is switched on to the discharge circuit (Fig.) With a capacitive storage device 23 via a controlled discharge generator 24, which is triggered from the sequential ignition unit 25.

When the discharge 24 is triggered, the capacitor bank 6 of the accumulator 23 provides for the formation of an expanding channel of a high-current discharge in chamber 1.

The plasma formed from the gas discharge splashes into the expansion chamber 4 as a result of expansion during heat release by Joule, as well as under the force of electromagnetic interaction of oppositely directed discharge currents and the metal bus 2 located near the discharge chamber. in the tire, it pushes away the plasma with the current but its discharge current to barrier 14 toward the expansion chamber 4.

The resulting shock wave is formed into a flat one at the initial part of the expansion chamber, i.e. between the discharge chamber and the obstacle, where as the shock wave and plasma flow are decelerated, an increase in the brightness of the study emanating in the face direction is observed.

Subject invention

Claims (3)

1. Gas dynamic light source for ed. St. 275259, characterized in that, in order to maximize the radiation of the light source to the radiation of an absolutely black body with a higher plasma temperature and increase the life of the source when using it with increased energy of a short high-current discharge, the end part of the tube facing the discharge chamber an optically transparent barrier is installed, which serves as a window for radiation output and is placed near the discharge chamber in a plane parallel to a mirror located on the wall of the discharge chamber surface which is perpendicular to the longitudinal axis of the tube. 2. The source of light according to claim 1, characterized in that the carrier tube, which also acts as a channel for transmission radiation associated with the flask at the end of the cylindrical process remote from the discharge chamber by means of an intermediate metal element simultaneously sealing the flask and carrying a slit diaphragm oriented parallel to the mirror and an optically transparent barrier. 3. The source of light in PP I and 2, characterized in that the optically transparent barrier is made in the form of a hollow cone with a longitudinal axis perpendicular to the mirror and with an angle of 140 °. 479177 I GI 17 20 tS FIG 22 12 Fig2