| 摘要 |
A process for anticipating the service life of a rare gas discharge lamp and a system for anticipating the service life of a rare gas discharge lamp. In a process for anticipating the lifetime of a rare gas discharge lamp in which an arc tube contains an opposed anode and cathode and in which the cathode contains an emitter substance, the rare gas discharge lamp is supplied with a certain current which is lower than the rated current, the voltage of the rare gas discharge lamp is determined at this instant and the swing width of this voltage is measured, and using the value of the swing width of this voltage, the service life of the rare gas discharge lamp is anticipated. A device for executing the process has a current control for controlling current supplied to the rare gas discharge lamp, a voltage detector for determining the voltage of the rare gas discharge lamp, a voltage swing width detector for determining a swing width of the voltage based on the voltage determined by said voltage detector, a basic data memory mechanism which stores values of the swing width of the voltage for the rare gas discharge lamp operated with the rated current which have been measured beforehand by operation of the lamp a the reduced current, a comparator for comparing measured values of the swing width of the voltage of the rare gas discharge lamp when the current control supplies a reduced current which is lower than the rated current, to data stored in the basic data memory mechanism and for outputting a difference value corresponding to the difference between, and corresponding to the difference between, and a duration of service life converter for converting the difference value output by the comparison means into an indication of the service life of the rare gas discharge lamp.
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