Anodic Oscillations and Noise Generated in Glass Bulb Mercury Arc Rectifiers
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概要
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Voltage oscillations and noise occur generally in low pressure gaseous discharges. In glass bulb mercury arc rectifiers, oscillations and noise are generated the same as in the other discharge tubes, for example fluorescent lamps. The properties of oscillations and noise were observed with oscilloscopes or synchroscope at several rectifiers and the frequency spectrum of radio noise was measured by noise meters. The oscillations are anodic oscillations generated in anode region. They have two types, one of which is low frequency pulsatory (rarely saw-tooth wave) fluctuation having frequency below 10kc/s and peak to peak amplitude below several volts and the other is high frequency quasi-sinusoidal oscillation having frequency about 100kc/s and the same amplitude as the former. Low frequency fluctuations are generated in some rectifiers in a range of arc current, ambient temperature or residual gas pressure, accompanied by a faint glow which surrounds a cylindrical anode. High frequency oscillations appear very stably in other rectifiers, accompanied by a bright glow ball contacting on the front surface of the anode. Frequency of two types of oscillations is affected by arc current, ambient temperature, residual gas pressure, magnetic field or parallel connected capacitor. On the hypothesis that these oscillations are periodic repititions of generation of excess ions and the decay of ion density by ambipolar diffusion, the life time of ion can be calculated. The frequencies calculated on some assumptions appreciably agree well with experimental results. The noise has a continuous spectrum, which is such that the noise intensity gradually decreases with higher frequencies in the broadcast band and becomes weaker in the short wave band. It varies with the arc current and the ambient temperature. The suppression of noise is achieved, in addition to shunting the arc with a capacitor, by anchoring the cathode spot or eliminating anodic oscillations.
- 山梨大学の論文
- 1965-12-20
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