门控分幅相机增益衰减特性
Gain attenuation of gated framing camera
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摘要: 分析了分幅相机增益衰减的理论模型，利用Mathematica软件模拟了增益随电脉冲传输时间指数衰减的曲线图。根据增益衰减理论，设计了测量增益衰减系数的实验。实验结果表明：分幅相机的平均增益按0.024 9 mm-1指数衰减，电脉冲沿微带线传输的电压幅值衰减系数平均为0.003 56 mm-1。得出实验数据中单条微带上增益并不完全符合增益指数衰减规律，而是在最后一帧图的增益有所回升，分析得出这是由电脉冲在微带末端连接处的反射引起的。经多次测量，电脉冲在微带线末端的平均值反射比为24.2％。对增益衰减状况的改善提出建议：采用良导体制作传输线，选取介质损耗小和绝缘性能好的材料作为填充介质，合理设计MCP微带线的厚度、微带宽度及微带与输出面的间距则可减小分幅相机增益的衰减。Abstract: The theoretic model of framing camera’s gain attenuation is analyzed. The exponential attenuation curve of the gain along the pulse propagation time is simulated. An experiment to measure the coefficient of gain attenuation based on the gain attenuation theory is designed. Experiment result shows that the gain follows an exponential attenuation rule with a quotient of 0024 9 mm－１,the attenuation coefficient of the pulse is 0.003 56 mm－１. The loss of the pulse propagation along the MCP stripline is the leading reason of gain attenuation. But in the figure of a single stripline, the gain dose not follow the rule of exponential attenuation completely, instead, there is a gain increase at the stripline bottom. That is caused by the reflection of the pulse.The reflectance is about 24.2％.
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Key words:
- icf /
- framing camera /
- microchannel plate /
- gain attenuation /
- x-ray /
- radiation /
- reflection
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