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金属卤化灯的放电特性、发光效率、显色性和工作寿命都明显地受电孤管内有害杂质气体的影响,其中最有害的气体是氢气.如果外壳内氢气分压强远低于电孤管内氢气分压强,则有些氢气从电孤管内经高温的石英壁扩散入真空外壳中.一般外充内放入一种像Z_r—Al那样的吸气剂,它将能吸除氢气.在本试验中,用回旋质谱计分析外壳内残余气体,而用B—A真空计测量总压强.最后,实验给出了残余气体随灯管寿命的变化,以及灯管起动电压和端电压因外壳中氢气压力的增大而升高.
The discharge characteristics, luminous efficiency, color rendering and working life of metal halide lamps are obviously affected by the harmful impurity gases in the electric arc tube, the most harmful gas is hydrogen. If the partial pressure of hydrogen in the shell is far lower than the hydrogen in the electric arc tube Partial pressure, then some hydrogen from the high temperature inside the arc tube quartz wall diffusion into the vacuum envelope.Generally filled with a like Z_r-Al getter, it will be able to get rid of hydrogen.In this experiment , The cyclotron mass spectrometer was used to analyze the residual gas in the shell and the total pressure was measured with a B-A vacuum gauge.Finally, the experiment gave the change of the residual gas with the life of the tube, and the lamp starting voltage and terminal voltage were changed due to the hydrogen pressure in the shell Increase and increase.