Study on temperature distribution around bulb envelope and cavity of high power PLS

摘要

PLS(Plasma Light System) is one of the electrodeless lamp discharged by microwave. High efficacy and CRI visible light similar to daylight is radiated. It is mainly composed of microwave part and optical part. Microwave parts consist of magnetron, waveguide and cylindrical cavity, while optical parts consist of bulb, mirror and reflector. High power microwave generated by magnetron is focused on bulb located inside cavity. The neutral buffer gas inside bulb envelope, at a pressure of tens of torrs is ionized by microwave and ionized gas excites solid-state chemical fills to be in a state of high pressure and temperature plasma. Bulb envelope made of fused quartz should be rotated to bear up against high temperature and maintain uniformity inside envelope. We studied the temperature distribution around rotating quartz envelope and metal cavity. Through this works, we could achieve the thermal reliability of envelope and cavity.