基于粒子成像测速技术的水中气泡界面的光学性质研究

基于粒子成像测速的流体可视化技术，根据菲涅耳公式计算了入射到水中气泡界面的光强，得出点光源连续两次反射或折射的光强具有等比数列的规律，光线在气泡界面反射、折射4次就变成完全偏振光且光线几乎消失.当入射角避开35°左右时，即便有一定宽度的线光源入射到气泡界面，第2次折射出气泡的光强与线光源的宽度无关，类似一条光线入射所产生的光强，给出了面光源在界面所产生的光强的二重积分表达式.线光源所产生的界面光强理论值、面光源产生的光强数值解与实验值都较为符合. 关键词： 水中气泡 界面 光强 粒子成像测速

Study of the interface optical property of bubbles in water based on PIV

Based on the technique of PIV (particle image velocimetry),We calculated the light intensity of the bubble interface and discovered that the intensities of lighr reflected or refracted twice succeedingly abide by the rules of geometric series, and the light will disappear after reflecting or refracting 4 times by the bubbles. When the angle of incidence of 35° is avoided , the intensity of second refraction out of a bubble is independent of the incident beam width, similar to the case of a narrow light ray falling on the bubble interface. The integral formulas for the intensities of reflection or refraction are given for the planar light beam falling on the bubble interface. The numerical solution of the integral is in agreement with the experiment value.