郑维民, 张晓娟. 用红外测温仪观察二极管板流引起的阴极降温现象[J]. 应用光学, 2009, 30(1): 134-138.
引用本文: 郑维民, 张晓娟. 用红外测温仪观察二极管板流引起的阴极降温现象[J]. 应用光学, 2009, 30(1): 134-138.
ZHENG Wei-min, ZHANG Xiao-juan. Observation of cathode temperature-drop phenomenon caused by diode board-current with IR thermometer[J]. Journal of Applied Optics, 2009, 30(1): 134-138.
Citation: ZHENG Wei-min, ZHANG Xiao-juan. Observation of cathode temperature-drop phenomenon caused by diode board-current with IR thermometer[J]. Journal of Applied Optics, 2009, 30(1): 134-138.

用红外测温仪观察二极管板流引起的阴极降温现象

Observation of cathode temperature-drop phenomenon caused by diode board-current with IR thermometer

  • 摘要: 为了观察由板流引起的灯丝温度下降现象,利用红外测温仪对理想二极管灯丝温度作了精密测量。由于忽略了板流,导致阴极灯丝温度下降,致使测得的金属逸出功存在着大约-1.86%的系统相对误差。实验验证了当灯丝电流和板流较小时,测不出灯丝温度随板流的变化。当灯丝电流为0.74A以上时,可以明显地观察到输出板流后,灯丝温度要比板流为0时低(1~2)K,此结果与预测值十分相符。

     

    Abstract: In order to observe the phenomenon of the filament temperature drop caused by the board-current, the ideal diode filament temperature was detected precisely with an infrared thermometer. Since the cathode filament temperature drop caused by the boardcurrent was neglected, it resulted in about-1.86% system relative error in the measured metal work function. The phenomenon was found through a theoretical analysis, and it was verified by an experiment.When both the filament current and board-current are lower, the variation of the filament temperature with the board-current is not measurable; when the filament current is above 0.74A, it can be clearly observed that the filament temperature is (1~2)K lower than that of zero board-current after the board-current is outputted.

     

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