Microwave excitation device of electrodeless lamp

Abstract

The invention discloses a microwave excitation device of an electrodeless lamp. The microwave excitation device comprises an electrodeless lamp tube, a metal cavity, a dielectric resonator and a microwave inputting device. The metal cavity comprises a microwave inputting opening and a microwave outputting opening. The dielectric resonator is installed inside the metal cavity, microwave energy is fed into the metal cavity from the microwave inputting opening through the microwave inputting device so that the dielectric resonator can resonate, and one end of the electrodeless lamp tube extends into the metal cavity from the microwave outputting opening, makes contact with the dielectric resonator and is excited by microwaves output by the dielectric resonator to emit light. The microwave excitation device of the electrodeless lamp is compact in structure, can easily achieve good microwave inputting matching through adjusting coupling between the microwave inputting device and the dielectric resonator and is high in excitation efficiency, and working frequency is easier to control.

Description

[technical field] [0001] The invention relates to an electrodeless lamp light source, in particular to a microwave excitation device for an electrodeless lamp. [Background technique] [0002] The electrodeless lamp has no built-in electrodes, and the discharge cavity can be sealed with a single material, thus greatly prolonging the life of the electrodeless lamp. The microwave electrodeless discharge lamp is a microwave trigger coupled plasma electrodeless light source (Microwave trigger coupled plasma electrodeless light source) working on the principle of microwave coupling discharge. [0003] Microwave discharge is to feed microwave energy generated by a microwave source such as a magnetron into a resonator through a waveguide or a coaxial line, thereby exciting an electrodeless discharge tube to emit light. During the microwave discharge process, electrons constantly change their direction of motion due to elastic collisions with surrounding particles, and gradually obt...

AI Technical Summary

Problems solved by technology

Its size depends on the operating frequency of the excitation microwave, limited to the frequency of the microwave source, it is often difficult to miniaturize the excitation device, and its excitation efficiency is low

[0005] The 201280032914.5 invention patent discloses a transparent waveguide electromagnetic wave plasma light source. By loading the excitation antenna with an alumina block, the excitation volume of the plasma light source is effectively reduced, but because the microwave energy is directly coupled into the plasma material seal through the excitation antenna , the coupling control is not easy, and the matching of the input port of the excitation device is difficult

On the other hand, since the relative permittivity of the alumina material is often lower than 10, the microwave energy of the excitation device is not concentrated enough, thereby reducing the excitation efficiency of the plasma light source.

Images