SU1534552A1 - Gaseous-discharge spectral lamp - Google Patents

Abstract

The invention relates to electrical engineering, in particular to gas discharge lighting lamps emitting the spectra of various chemical elements and intended for use in atomic absorption equipment and spectrophotometric devices. The purpose of the invention is to increase the service life while simplifying the manufacturing technology. The discharge tube of the spectral lamp contains an inert gas-filled flask 1 with an end window 2, a cathode 4 coaxially mounted on it with a cylindrical plane, an anode 3 in the form of a hollow cylinder, and a tubular insulator 6 in the form of a cone between them, protruding above the end surface of the cathode to the side windows 2.5 - 3.5 times the diameter of the cathode cavity. The end surface of the anode from the cathode side is located at the level of the cone end on the side of the window. 1 il.

Description

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The invention relates to electrical engineering, in particular to gas discharge lighting lamps emitting the spectra of various chemical elements and intended for use in atomic absorption equipment and other spectrophotometric devices.

The purpose of the invention is to increase the life of the lamp while simplifying its manufacturing technology.

The drawing shows the proposed lamp, the general view,

The gas discharge of the spectral lamp contains a glass cylindrical flask 1 with a flat window 2, transparent in the spectral range 210–2000 nm, an anode 3 in the form of a hollow cylinder, a hollow cathode 4, a tubular insulator 5 installed between them with a conical protrusion 6, centering mica discs 7 and 8, and ceramic insulating tubes 9 assembled on current leads 10, flasks 1 welded to the leg 11. The cathode 4 has 3 shoulders on the outer surface from the anode side and is made (in whole or in a layer surrounding the cavity} of metal whose spectral lines are necessary imo get.

The disk 8 with the central hole is tightly mounted on the external surface of the conical tube 6 and pressed by wire racks to the disk 7, the electrode assembly is simply and securely fixed, i.e. the taper of the protrusion 6 will increase mechanical reliability while simplifying the lamp assembly technology. In a concrete example, flask 1 is filled with neon under a pressure of 1 kPa and is equipped with a base for a standard octal panel. The inner diameter of the anode

About 15 mm, the outer diameter of the cathode 4 in the area of the collar 10 mm, the rest of the part - 8 mm, the diameter of the cavity

4mm. The insulator 5 is made of a glass tube with an inner diameter of 11.5 mm, the protrusion 6 in the assembled lamp protrudes 11–12 mm above the end of the cathode 4, the internal diameter of the protrusion 6 at its end is 8 mm.

When the lamp is supplied with a constant or pulsed current between the hollow cathode 4 and the anode 3, a glow discharge in an inert gas is initiated, intense ion bombardment of the cathode 4 and its sputtering occur, and pairs of cathode material 4 are generated in the discharge channel, which excites and radiate.

Claims (1)

Invention Formula A gas discharge spectral lamp containing a flask with an end window filled with an inert gas for exit of radiation, a cathode with a cylindrical cavity coaxially mounted in it, an anode in the form of a hollow cylinder and a tubular insulator positioned between them, protruding above the end surface of the cathode towards the window, characterized by the fact that, in order to increase the service life while simplifying the manufacturing technology, the protruding part of the insulator is made conical, tapering towards the window, its end is located at the level of the end face overhnosti anode from the cathode side, and the length and composition of smallest inner diameter L are respectively 2.5 to 3.5 and 1.7-2.2 of the diameter of the cathode cavity.