Abstract:
The efficiency of a conventional high-pressure gaseous discharge lamp, such as a 400 watt mercury-vapor lamp, is increased by pulse-operating the lamp at power loadings which are higher than the average rated power input of the lamp. The highpower pulses are of such magnitude and duration that the resultant average power input does not exceed the power loading for which the lamp is designed and rated. This is achieved by generating a series of high-voltage pulses with a suitable circuit and applying the pulses to the lamp electrodes. Optimum results in the case of conventional high-pressure mercury-vapor discharge lamps having ratings of from 100 to 1,000 watts are obtained with pulses that have a magnitude of from 60 to 600 volts, are 0.2 to 5 milliseconds in duration and have a repetition rate of from 50 to 500 pulses per second. In order to prevent arc extinction between pulses, the latter are preferably superimposed on a ''''keep-alive'''' DC potential that constitutes from three to 20 percent of the rated average power input of the lamp.
Abstract:
METHOD OF PRODUCING GASLESS, ELECTRON-EMISSIVE ALKALINEEARTH OXIDE COATED TUNGSTEN ELECTRODE, WHEREBY THE ELECTRODE IS ACTIVATED AND RENDERED CHEMICALLY STABLE PRIOR TO INCORPORATION INTO A DISCHARGE DEVICE BY HEATING THE TUNGSTEN ELECTRODE COATED WITH ALKALINE-EARTH METAL CARBONATE TO CONVERT THE CARBONATE TO THE OXIDE AND RENDER THE OXIDE AIR STABLE.
Abstract:
The arc length, light output and efficiency of an elongated discharge lamp, such as a fluorescent lamp, are increased by providing a planar partition within the envelope that extends laterally to the envelope walls and defines a single helical discharge channel that spirals around the envelope axis. The helical partition, electrodes and base contacts are structurally arranged to provide a compact single-ended (or double-ended) lamp of high luminous intensity. Auxiliary electrodes and a starting resistor are included as integral components in one embodiment to provide a self-starting low-pressure discharge lamp of the single-ended variety. In another embodiment the envelope has an axially-extending cavity that is open to the atmosphere and accommodates a rod type laser which is thus tightly coupled optically with the surrounding helical arc and efficiently ''''pumped'''' by the lamp. The lamp, in this case, can comprise a ''''flash'''' lamp that is pulsed rather than operated continuously.
Abstract:
THE METHOD OF PRODUCING AIR STABILIZED-EARTH METAL OXIDE EMISSION MATERIAL BY MEANS OF A TWO-STEP HEATING PROCESS OF MIXED ALKALINE-EARTH METAL CARBONATE, BY WHICH THE EUTECTIC MELTING STAGE OF THE CARBONATE-OXIDE MIXTURE IS AVOIDED. ALKALINE-EARTH METAL CARBONATE IS HEATED TO A TEMPERATURE WHICH IS BELOW THE EUTECTIC MELTING TEMPERATURE FOR ALKALINE-EARTH CARBONATE-OXIDE MIXTURES. THE HEATING IS CONTINUED UNTIL ALL OF THE ALKALINEEARTH METAL CARBONATE IS CONVERTED TO ALKALINE EARTH METAL OXIDE. THE ALKALINE-EARTH METAL OXIDE IS THEN HEATED FROM ABOUT 1300*C. TO ABOUT 1750*C. FOR A PREDETERMINED TIME TO RENDER THE OXIDE AIR STABLE.