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Tags: Source, Light, Frequency, Radio, Radio Frequency Light Source,
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Radio Frequency Light Source
#1

RF light sources follow the same principles of converting electrical power into visible radiation as conventional gas discharge lamps. The fundamental difference between RF lamps and conventional lamps is that RF lamps operate without electrodes .the presence of electrodes in conventional florescent and High Intensity Discharge lamps has put many restrictions on lamp design and performance and is a major factor limiting lamp life. Recent progress in semiconductor power switching electronics, which is revolutionizing many factors of the electrical industry, and a better understanding of RF plasma characteristics, making it possible to drive lamps at high frequencies.

There are three practical ways to energize RF light sources, though there are more ways to create RF plasmas. These three ways correspond to different types of interaction of electromagnetic fields with the bounded plasma and to different kinds of RF discharges. They are: capacitive, inductive and wave sustained discharges.

The most suitable frequency range is 2.2 - 3.0 MHz [2.65MHz is the standard] for RF lighting devices. An RF generator (RF ballast) is the essential yet most expensive part of a modern RF lighting system
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#2
RF light sources follow the same principles of converting electrical energy into visible radiation like conventional gas discharge lamps. The fundamental difference between RF lamps and conventional lamps is that RF lamps work without electrodes. The presence of electrodes in conventional fluorescent lamps and high intensity lamps has placed many restrictions on the design and performance of the lamp and is an important factor limiting lamp life. Recent advances in semiconductor power switching electronics, which is revolutionizing many factors in the electrical industry, and a better understanding of the characteristics of RF plasma, which makes it possible to drive the lamps at high frequencies.

The first proposed RF illumination, as well as the first patent on RF lamps, appeared about 100 years ago, half a century before the basic principles of gas discharge-based lighting technology were developed.

Discharge tube is the device in which a gas conducting an electric current emits visible light. It is usually a glass tube from which virtually all air (producing a near vacuum) has been removed, with electrodes at each end. When a high voltage current passes between the electrodes, the few remaining gas atoms (or some deliberately introduced) ionize and emit colored light as they conduct the current along the tube. Light originates when electrons change energy levels in ionized atoms. By coating the inside of the tube with a match, invisible emitted radiation (such as ultraviolet light) can produce visible light; this is the beginning of the fluorescent lamp. Let's consider different types of RF discharges and their advantages and restrictions for lighting applications.
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