Thickness Measurement of Full Field Soap Bubble Film in Real Time Based on Large Lateral Shearing Displacement Interferometry
Soap bubble has a profile nearly the same as a perfect sphere. Many researches focus on the measurement of the film thickness of the soap bubble over time in order to calculate the film drainage rate. Its thickness variation in gravitation field can be respectively approximated with many models, considering the cost and precision in different applications. In this research, fringe patterns of a soap bubble were captured continuously using the large lateral shearing displacement interferometry during the process from its formation to burst. From the analysis of three typical frames, it can be seen that the film thickness distribution along the gravity orientation shows a very good agreement with an exponential model. The ratio of its maximum error to the laser wavelength is 3/8, existing at the spheres center. Moreover, it can be seen that the absolute value of the parameter k in the exponential model keeps increasing over time, while the parameter b keeps decreasing over time. Based on the parameter k from the exponential model, the maximum limit in the thickness measurement of the soap bubble film can be calculated from the function of the fringe patterns resolution and its field coordinates. The result shows that there is a special point above the spheres center, being the right place where the gradient of phase order changes its sign. The region near this point presents very high limitation in the film thickness measurement.
lateral shearing interferometry soap bubble film thickness
Wei Lv Huai-chun Zhou Jin-rong Zhu
State key laboratory of coal combustion, Huazhong University of science and technology, Wuhan, 43007 Research Center of Thermophysics Engineering, School of Energy and Power Engineering, Huazhong Unive
国际会议
The 7th International Symposium on Measurement Techniques for Multiphase Flows(第七届国际多相流测试技术会议)
天津
英文
209-216
2011-09-17（万方平台首次上网日期，不代表论文的发表时间）