激光干涉法检测回流离子特征参数的实验研究
Experimental study of character diagnosis of back streaming ions by laser interferometry
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摘要: 分析了回流离子基本物理特性及特征参数的检测与信号处理方法，设计了激光干涉实验方案。简要介绍了该实验方案的优缺点，并针对具体实验调试工作中出现的不利于信号检测的问题,总结出了解决方法：严格按照成像质量要求进行光学元器件的设计、加工、选型、调试,可获得较为理想的静态干涉图像；在激光干涉条纹输出与分幅相机之间增加一定缩束比例的缩束镜，可获得动态干涉图像；采用铅等重金属材料对分幅相机进行屏蔽可提高测量图像的信噪比；在6 μs时间段内，采用变时延和时间间隔的方法，获得了回流离子的状态信息。最后对实验所获得的干涉图像进行了分析处理，获得了假设条件下回流离子的密度分布。Abstract: The basic physical properties, the methods about the detection of character parameters, and the signal disposal of back streaming ions are analyzed. A program about laser interferometry is designed. The strongpoint and disadvantage of the program are introduced briefly. Based on the concrete experimental test, approaches for high quality images are summarized. Dynamic interferometry image would be obtained through adding a cutdown lens between the output of laser interferometry list and the framing camera. The signal-to-noise of measured images would be improved through shielding the framing camera using plumbum and some other heavy metal materials. Within 6μs, the state information of back streaming ions can be obtained by changing delay and time space. Through analysis and disposal of
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Key words:
- back streaming ions /
- laser interferometry /
- x-ray source /
- spot /
- character parameters
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