基于远场干涉测平板玻璃内的气泡直径

Measurement of Bubble Diameter in a Flat Glass Based on Far-Field Interference

提出一种测量平板玻璃中气泡直径的方法。用平行He-Ne激光束照射平板玻璃内的气泡,在远场产生圆环状干涉条纹。利用气泡远场干涉理论模型,使用分光仪对平板玻璃外干涉条纹角位置进行测量,由折射定律换算为平板玻璃内干涉条纹角位置,进而使用计算软件mathematica计算出气泡直径,测量结果显示平板玻璃内气泡的形状为椭球。给出了快速测量气泡直径的建议。因为是远场干涉,对气泡在载物台上方的位置要求不严格。对夫琅和费圆屏衍射条纹的干扰进行了分析,为平板玻璃内气泡直径测量提供了一种新的方法。

A method for measurement of bubble diameter in the flat glass is presentecl. With parallel He-Ne laser beam irradiating the bubble, circular interference fringe is produced in the far-field. Based on the far-field theoretical model, the angle position of interference fringes outside the flat glass is measured with spectrometer and converted into the angle position of interference fringes inside the flat glass according to Snell＇ s law and then the bubble diameter is calculated with mathematica. The measurement results indicate the bubble in the flat glass is ellipsoid. Suggestion of rapid measurement of bubble diameter is given. Because of far-field interference, the demand for the bubble location over platform is not strict. The interference caused by Fraunhofer screen diffraction fringes is analyzed and a completely new method is provided for measurement of the bubble diameter in the flat glass.