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RF driven sulfur lamp having driving electrodes which face each other

Patent ·
OSTI ID:872346
 [1];  [2];  [3];  [4];  [5]
  1. Lafayette, CA
  2. Castro Valley, CA
  3. Oakland, CA
  4. Orinda, CA
  5. San Francisco, CA
+ Show Author Affiliations

A high intensity discharge lamp without mercury is disclosed radiating a selected spectrum of which can be almost entirely in the visible range from an envelope that contains a sulfur containing substance. The lamp utilizes a signal source that generates an excitation signal that is externally coupled to the exterior surface of the envelope to excite the enclosed sulfur containing substance. Various embodiments of the lamp use electrodes adjacent the envelope to couple the excitation signal thereto with the face of the electrodes shaped to complement the shape of the exterior surface of the envelope. Two shapes discussed are spherical and cylindrical. To minimize filamentary discharges each envelope may include an elongated stem affixed to the exterior thereof whereby a rotational subsystem spins the envelope. In yet another embodiment the envelope has a Dewar configuration with two electrodes, one positioned near the external curved side surface of the body, and a second to the inner surface of the hole through the envelope. Further, the envelope may contain a backfill of a selected inert gas to assist in the excitation of lamp with that backfill at a pressure of less than 1 atmosphere, wherein the backfill pressure is directly related to the increase or decrease of peak output and inversely related to the increase and decrease of the emitted spectrum from the envelope. The emitting fill can be less than 6 mg/cc, or at least 2 mg/cc of the envelope of a sulfur containing substance.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
DOE Contract Number:
AC03-76SF00098
Assignee:
Regents of University of California (Oakland, CA)
Patent Number(s):
US 5914564
OSTI ID:
872346
Country of Publication:
United States
Language:
English

References (5)

Detection of sulfur dimers in SF 6 and SF 6 /O 2 plasma‐etching discharges journal April 1989
Stable pure sulfur discharges and associated spectra journal August 1980
The Identification of Molecular Spectra book January 1976
Technique for measuring rotational temperature of microwave excited diatomic sulfur journal January 1980
Radiative efficiencies of radio frequency sulfur discharges journal July 1985

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Related Subjects

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backfill
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cylindrical
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elongated
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excite
exterior
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external
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filamentary
fill
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inert gas
inner
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inversely
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mercury
mg
minimize
near
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rf
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rotational
selected
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sulfur
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various embodiments
visible
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whereby