Emission Properties of Compact Antenna-Excited Super-High Pressure Mercury Microwave Discharge Lamps

Abstract

A compact high-intensity microwave discharge lamp and ignition system have been investigated using a couple of antennas and a solid-state microwave generator. It is found that the antenna-excited microwave discharge lamps can sustain mercury discharges at pressures higher than 100 atm with 2.45 GHz microwave power lower than 80 W, and that a stable plasma column is generated isolated from the lamp wall. The radial radiant profile is much different from that of conventional microwave discharge lamps without electrodes.

Compact Sulfur Lamps Operated by Antenna-Excited Microwave Discharge

“…These experiments have been carried out using high-pressure metal-halide lamps [1][2][3][4] and extremely high-pressure mercury discharge lamps. 5,6) The results showed stable high-pressure microwave discharges confined to the antenna gap because of efficient microwave power supply into the discharge space of the lamp using small antenna gap effects. Antenna-excited microwave discharge is called AEMD hereafter.…”

Production of atmospheric pressure microwave plasma with dielectric half-mirror resonator and its application to polymer surface treatment

“…12) Mizojiri et al reported APMP production using an antenna where plasma is produced on the tip of wire. 13) By combining a waveguide and a tube, a microwave torch using He has also been produced. 14,15) Another way to produce the APMP is the use of a discharge gap.…”

Emission Properties of Antenna-Excited Microwave Discharge Lamps Filled with Extremely High Pressure Mercury

“…In our previous study, 4) we demonstrated that the AEMD lamp could sustain mercury discharge at a pressure of around 100 atm using 2.45 GHz microwave power at a power of lower than 80 W. Therefore, the AEMD lamp ignition system is suitable as a light source for data projectors and many other lighting systems. Khan et al 6,7) have fabricated two types of miniaturized high-intensity discharge lamps using the techniques of micromachining and ICs.…”

“…A lamp ignition system for compact high-intensity discharge lamps has been investigated by our group [1][2][3][4][5] by applying the antenna effect to feed microwave power into high-pressure discharge lamps. The ignition system simply consists of a pair of antennas installed on compact discharge lamps and a solid-state microwave generator (SPC Electronics ESG-2450S-2A).…”

“…Recently, the advantages of AEMD lamps were clarified by comparing them with the properties of superhigh-pressure mercury discharge lamps sustained by electrodeless discharge. 4) The AEMD lamps had much more stable ignition and the properties such as radiant power and luminous efficacy were considerably improved. These superior properties are based on the fact that the plasma column is strictly confined in the antenna gap at the center of the lamp and is isolated from the lamp wall due to the highpressure gas, which leads to a lower lamp wall temperature and a higher lamp efficacy.…”