新しい数式モデルによる高圧水銀ランプの点灯動作シミュレーション : 始動時間の短縮に関する検討

概要

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By the simulation model for high pressure mercury lamps with electrical conductivity in plasma,we have studied mainly on shortening of the starting time. The summary is as follows. (1) When the thermal conductivity of inside enclosure gas of out tube is smaller, the starting time is shortened. (2) When the outside diameter of the arc tube of lamp is larger, or the thickness of the arc tube of lamp is larger, the starting time is shortened. (3) When the ambient temperature raise,the starting time is shortened. (4) When the ambient temperature is 9 [℃], the oscillation of effective temperature of plasma and light output appears, in the calculation by means of this mathematical model. Under 8 [℃], they become to be severe and stop halfway. (5) In the experimental calculation,if it don't make decrease light output (radiated electric power), it is possible to continue the calculation until 0 [℃]. (6) The above mentioned matters suggest that an additional supply of appreciated input in starting seems to be effective, such as heating arc tube or superposition of high voltage pulse between electrodes and so on.