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基于低振动低温恒温器,建立了一套用于冷冻靶参数测量的马赫-曾德尔激光干涉显微系统。考虑光折射效应,推导出了靶丸光程差随入射角变化的完整表达式。在低温环境中,当燃料固化或完全气化时,分别获取了靶丸中心存在条纹时的干涉图。基于干涉条纹形状分析法,利用光程差表达式分别计算了靶丸壁厚及靶丸内燃料气体浓度。同时,用非破坏性方法对气体浓度测量结果进行了实时标定。两种方法给出的结果之间的相对误差小于5%。
Based on the low vibration cryostat, a set of Mach-Zehnder laser interferometry microscopy system for frozen target parameter measurement was established. Considering the effect of light refraction, a complete expression of the change of the optical path difference with the angle of incidence is derived. In the low temperature environment, when the fuel is solidified or completely gasified, the interferogram of the center of the pellet is obtained respectively. Based on the interference fringe shape analysis method, the wall thickness of the target and the concentration of the fuel gas in the target were calculated by using the optical path difference expression. Meanwhile, the non-destructive method was used to calibrate the gas concentration measurement in real time. The relative error between the results given by the two methods is less than 5%.