SU1285543A1 - Method of performing quality control of discharge tubes of gaseous-discharge lamps - Google Patents

Abstract

The invention relates to the manufacture of gas discharge devices and light sources and can be used to control the quality of discharge tubes. The aim of the invention is to increase the accuracy of determining the amount of alkali metal diffused through the discharge tube of the gas discharge lamp. A metal measuring electrode (E) in the form of a ring, a spiral, or a grid is placed close to the external flask of the gas discharge lamp. The lamp is connected to the electrical network in accordance with the measuring circuit. After the lamp reaches the operating mode, a negative voltage is applied to the measuring electrode and the ion current flowing in the circuit is measured. Continuing the straight-line portion of the obtained current-voltage characteristic to the intersection with the axis of the currents, determine the saturation current at zero potential at the electrode. According to the Farad's law, the amount of alkali metal diffused by a unit of time through the walls of the discharge tube is determined from the magnitude of this current. The resulting parameter determines the quality of the discharge tubes, 2 Il. i (L 1C 00 ate 00

Description

The invention relates to the production of gas discharge devices and light sources and can be used to diagnose the quality of lamps and their rejection during production, as well as to predict their useful life and stability of light and electrical parameters.

The purpose of the invention is to increase the accuracy of determining the amount of alkali metal diffused through the discharge tube of a gas discharge lamp.

FIG. 1 is a schematic diagram of a device implementing the proposed method; in fig. 2 - dependence of the current through the measuring electrode on the voltage applied to this electrode.

An external flask of the finished gas discharge lamp, for example, a sodium lamp, is closely placed on metal

voltage, which indicates the onset of equilibrium between the amount of alkali metal diffused into a unit of time through the discharge tube, and the amount of ions of this metal, transferred by electrolysis through the outer glass shell of the flask to the electrode. Continuing this rectilinear section until it intersects with the axis of the currents, the saturation current 1 is determined at a zero potential at the electrode. Then, in accordance with the Farad's law, the amount m of an alkali metal diffused per unit of time through the discharge tube of a gas discharge lamp is determined:

TA-Ia

where A is the atomic weight of an alkali metal; Z is the alkali metal valency; F is the Farade number.

m value quality

By

measuring electrode E in the form of gas discharge tubes.

Yes, a spiral or mesh made of molybdenum, nickel or another metal. The lamp is connected to the electrical network in accordance with the measuring circuit (Fig. 1), kept for 10-12 minutes, until the lamp reaches the Formula

of

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The method of controlling tubes of a gas-discharging installation on a personal measuring supply to the electrodes of the working voltage of the lamp output to the working voltage electrode, measured by the voltage and the leakage electrode of the rum is quantified through the discharge metal, It is distinguished by the fact that, for the purpose of turning the method, the measuring devices are installed on the surface of the glass bulb of the lamp.

The external mode and temperature of the external bulb will not reach a maximum value of 250-300 0. Then, using a potentiometer R, the voltage applied to the measuring electrode is gradually increased, controlled by a voltmeter V. For each fixed voltage value, the value of the micrometer is determined ion current. According to the data obtained, a current-voltage characteristic of the dependence of the current on the applied voltage is constructed (Fig. 2). The dependencies are found to be the linear part.

the current at which the magnitude of the ion current weakly depends on the magnitude of the primal formula

from the bottom

thirty

35

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Method of quality control of discharge tubes of gas discharge tubes, including installation of a metal measuring electrode on a lamp, supplying a working voltage to the discharge tube electrodes, supplying a negative voltage to the measuring electrode after the lamp leaves the operating mode, measuring this voltage and flowing in the circuit current measuring electrode, according to which the amount of alkali metal diffusing through the discharge tube, characterized in that, in order to increase the method, the measuring electrode tanavlivayut on the outer surface of the glass bulb of the gas discharge lamp.

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00 800 that 1600 2000 /. at

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Claims (1)

Claim A method for controlling the quality of discharge tubes of gas discharge lamps, including installing a metal measuring electrode on a lamp, supplying an operating voltage to the electrodes of a discharge tube, supplying a negative voltage to the measuring electrode after the lamp has entered the operating mode, measuring this voltage and the current flowing in the circuit of the measuring electrode, according to which judge the amount of alkali metal diffusing through the discharge tube, characterized in that, in order to improve the accuracy of the method, the measuring electro e is installed on the surface of the outer glass bulb of a discharge lamp. dr φυιΐ. io'U l * 1 x- 400 800 1200 1600 2000 2400 in Fog. 2