A new structure of microwave-driven UV lamp

摘要

Microwave-driven electrodeless UV lamps are widely used in industry. However,the ultraviolet light intensity of the traditional UV lamps is non-uniform.In this article, a novel microwave-driven UV lamp structure for underwatersterilization is developed, which equalizes the UV light intensity of each lampat different positions. Based on the electromagnetic theory and the Drudemodel, finite difference time domain algorithm is adopted to obtain the dimensionsof this new structure. An experimental system is established, and fourUV lamp tubes are successfully excited and intensity of UV light at 253.7 nm istested by spectrometer. Results show that the UV radiation of each lamp isalmost same. The sensitivity of the structure is analyzed by changing themicrowave power and electron density of the UV lamp. It can be found thatsignificant changes in microwave power and electron density exhibit littleeffect on the uniformity of light intensity. Meanwhile, the microwave powershould be large enough to excite the UV lamp and electron density may affectthe S11 a little. Therefore, this structure can be applied to different types of UVlamps.