发现了凹形弯曲液面上边界反射光场的带状亮场扩张效应。当平行激光束垂直入射到两平行平板之间润湿效应引起的凹形弯曲液面上时，边界反射产生特殊反射图样，图样的中间为带状亮场，两侧为暗场，亮场中有清晰的带状衍射条纹，并且亮场宽度随入射光束宽度的增加而迅速地变大。分析了反射图样中带状亮场宽度与入射光束宽度的解析关系，进而精确地描述凹形弯曲液面的斜率和上升高度，建立了一种描述凹形弯曲液面特性的新方法。

The distensible effect of a strip-shape bright region light reflection from curved liquid surface was discovered. When a collimated laser beam illumines the sunk curved liquid surface by two parallel wetting plate,the special reflective patterns,which correspond to the boundary light reflection,can be produced. In fact,there is the pattern with a strip-shape bright region in the center,the high visibility diffraction fringes,dark region both sides and the width of bright region become big with the increased width of the incident beam. The relation of the width of the bright region and the width of the incident beam was derived theoretically. Subsequently,the slope,the contact angle and the surface height of liquid surface were calculated. It is believed that the distensible effect of a strip-shape bright region is capable of real time characterization of curved liquid surface.