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• W2739702316 abstract "An experimental study is carried out to investigate a bilateral direct-flow vortex tube o/ small ((0.33.0) 10 -2 m) size and to compare its optical properties with those characteristics of vortex tubes of a larger ((3-16). 10 -z m) scale. A model is suffested for forming transverse pro)~les of the intensity of loser beams with an intensUy hole in the center and of annular beams. In [1 ] a simple method is described which can be used to obtain a focusing medium that is formed in a swirled gas flow in a bilateral direct-flow vortex tube (BVT). Focal lengths of the BVT were found experimentally to vary form 7 to 102 m, depending on the length of its vortex zone. With a length of this device of 4-5 gauges, when the optical power of the device is maximal, tran~erse inten~ty profiles of fight beams with an intensity hole in the center and annual beams are formed within 0.35-0.85 of the radius of the displaced tube (the radius is 2.8-10 -2 m) and at inlet pre~ures of 1.05-1.70 kg/cm 2 [2 ]. The above-mentioned works are devoted to the development of a method for controlling laser radiation (with large beam cross-sections of (3-6)- 10 -2 m) which is based on using the vortex effect and has some advantages ever standard (using solid-state optics) and gaseous thermoconvective systen~. Therefore, it is of interest to use this method in particular practical applications of real laser beams with a small cross-section of between 0.3 and 1.2-10 -2 m. However, at present there are no works on the focusing properties of gas lenses of this type with small apertur~ ((0.5-1.5)- 10 -2 m) that could act effectively on laser beams with this cross-section. The present work is a study of the effect of the scale factor of the BVT on the focusing properties of a vortex gas flow. In our studies we used a BVT of a smaller scale in comparison with its analog used in [1 ]. It consisted of a cylindrical tube with a length of 12 gauges and with a radius of 0.87.10 -2 m and a displaceable tube with a radius of 0.4.10 -2 m. The design of the conical restrictor was not drastically changed and allowed variations of the width of the outlet slot for the periferal gas flow up to 0.3.10 -2 m. Operation of the BVT was provided by a high pressure source with a receiver connected via a pressure regulator with a tangential rectangular input with a cross-sectional area equal to 0.2 of the cross-sectional area of the cylindrical tube. The inlet pressure at the input of the device was measured with a standard micromanometer and in the experiments it was controlled with a valve within 1.5-3.0 kg/cm 2. The studies were carried out on an experimental bench (an analog of that used in [2 ]) whose structural components were a light source (an LG-38 laser), a BVT 0.465 m in length, and a device for measuring the diameter of the light beam at the outlet of the BVT located in-line. The light beam emitted by the laser was expanded to 8.10 -3 m at the natural divergence angle that coincided with the inner diameter of the displaced tube, which was the aperture of the BVT. In the experiment the diameter of the light beam was measured (using a screen) in various" @default.
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• W2739702316 date "1997-01-01" @default.
• W2739702316 modified "2023-09-24" @default.
• W2739702316 title "THE E FFECT O F T HE S CALE F ACTOR O N T HE FOCUSING P ROPERTIES O F A VORTEX G AS F LOW" @default.
• W2739702316 hasPublicationYear "1997" @default.
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