Abstract
A method for the non-destructive appraisal of the purity of the filling gas in incandescent lamps has been developed. The procedure involves the measurement of the characteristics of the glow discharge formed in the argon-nitrogen filling gas inside the lamp envelope by means of a high voltage, high frequency oscillator. The rate of decay with time of the glow discharge is measured at the wavelength of one of the molecular nitrogen bands in the glow discharge spectrum, and is correlated with the purity of the filling gas. Prototype electronic instrumentation is described which will perform the non-destructive measurement of afterglow time in incandescent lamps.
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