Abstract
The hollow-cathode glow-modulator tube has a cylindrical molybdenum cathode cavity and ring anode. An abnormal glow discharge is formed between these electrodes in a low pressure neon-argon gas mixture to create a high intensity source of light which passes out through the anode. The tube is used mainly in scanning and facsimile equipment.Impedance-frequency measurements have been made over the range 200 Hz to 6 MHz which at low frequencies have been related to the static voltage-current curves of the discharge. The effects of sputtering over periods up to 200 h have been observed and the cathode cavity has been sectioned and photographed. The results for various depth/diameter ratios are shown, each of which forms a spherical hollow after many hours of operation. The noise characteristics in a 6 kHz bandwidth have been measured over the range 5 kHz to 6 MHz and are explained with reference to the basic gas processes and the impedance characteristics. Identification has been made of the spectral lines from the discharge which are linearly proportional to current for the gas atoms and proportional to current cubed for cathodic atoms.
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