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 摘要對(duì)透明液體、固體中氣泡在激光照射下產(chǎn)生的一種非單心光束干涉進(jìn)行了遠(yuǎn)場(chǎng)分析,得到了程差公式,分析了干涉的區(qū)域、圓環(huán)狀干涉條紋內(nèi)密外疏的原因,通過干涉的方法可以測(cè)量氣泡的直徑,能夠用于介質(zhì)深處氣泡尺寸及泡內(nèi)氣體折射率的測(cè)量。