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Sulfur lamp

United States Patent Application

20020180356
A1
View the Complete Application at the US Patent & Trademark Office
An electrodeless discharge lamp includes a pair of opposed couplers aligned along an axis, a stationary light transmissive envelope positioned between the pair of opposed couplers, the envelope having an interior length along the axis which is greater than a maximum interior dimension of the envelope orthogonal to the axis, a light emitting fill disposed inside the envelope, the fill including at least one fill substance selected from the group of sulfur, selenium, and tellurium in a concentration of at least 1 mg/cc for each selected fill substance, and a power source connected to the couplers, wherein power applied to the couplers from the power source is effective to initiate and sustain a stable light emitting discharge from the fill. For example, the envelope may be capsule shaped or have the shape of a prolate ellipsoid. The lamp operates at low power and is stable without rotation.
Kirkpatrick, Douglas A. (Great Falls, VA), MacLennan, Donald A. (Gaithersburg, MD), Petrova, Tzvetelina (Springfield, VA), Roberts, Victor D. (Burnt Hills, NY), Turner, Brian P. (Germantown, MD)
10/ 116,748
April 5, 2002
[0002] Certain inventions described herein were made with Government support under Contract Nos. DE-FC01-97EE23776 and DE-FC26-01 NT41198 awarded by the Department of Energy (DOE). The Government has certain rights in those inventions.