What is Glow Discharge?
Glow discharge is a phenomenon where a continuous electrical discharge occurs within a low-pressure gas. When a discharge is triggered between two electrodes inside a glass tube kept at low pressure, the charged particles supplied between the electrodes accelerate, causing positive ions to collide with the negative electrode (cathode). This collision triggers secondary electron emission, which ionizes (excites) the gas molecules sealed within the tube, allowing a large electric current to flow.
In addition, light is emitted when the gas molecules are ionized. The color of this light varies depending on the type of gas used. Note that if the current flowing between the electrodes increases further, it will transition into an arc discharge accompanied by sparks, and the continuous discharge will cease.
Applications of Glow Discharge
By utilizing the characteristic where gas molecules emit light through continuous discharge, glow discharge is widely used in applications such as fluorescent lamps and xenon tubes. Compared to incandescent bulbs, it features lower power consumption and a longer lifespan. To initiate a glow discharge, it is necessary to apply a high voltage between the electrodes.
Matsusada Precision offers a comprehensive lineup of power supply equipment, including the high-voltage power supplies required to generate glow discharges.
- Related Terms:
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- Discharge
- Fluorescent Lamp
- Xenon Tube
