Method of operating a discharge lamp

Details Method of operating a discharge lamp Method of operating a discharge lamp

2005-01-18

2005-01-18

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S174000, C315SDIG005

Reexamination Certificate

active

06844687

ABSTRACT:
A method of operating a discharge lamp includes modulation of lamp power with a first longitudinal mode frequency to reduce segregation of the vapor phase species within the arc tube. The first longitudinal mode excitation frequency is determined by the acoustic response spectrum observed at an upper region of the arc tube when operated vertically. A frequency in an arc-straightening frequency range may also be added to the input power to straighten and center the arc.

REFERENCES:
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patent: 5134345 (1992-07-01), El-Hamamsy et al.
patent: 6124683 (2000-09-01), Olsen et al.
patent: 6184633 (2001-02-01), Kramer
patent: 6437517 (2002-08-01), Kramer
J. Olsen and W.P. Moskowitz,Optical Measurement of Acoustic Resonance Frequencies in HID Lamps, Proceedings of the IEEE Industrial Applications Society Annual Meeting, New Orleans, LA (Oct. 1997).

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