path length difference meaning in Chinese

光程长度差
路径长度差

A distant field interference of non - single - core light beams is analysed in a transparent liquid or solid when the bubble is irradiated with laser , a formula on optical path length difference is derived , interference regions and causes of interference rings thick inside and thin outside are analysed , the diameter of bubble can be measured by method of interference , the size of bubble and refraction index of gas inside the bubble can be measured in the depths of medium
摘要对透明液体、固体中气泡在激光照射下产生的一种非单心光束干涉进行了远场分析，得到了程差公式，分析了干涉的区域、圆环状干涉条纹内密外疏的原因，通过干涉的方法可以测量气泡的直径，能够用于介质深处气泡尺寸及泡内气体折射率的测量。