Study on thickness measurement for liquid film by means of laser diffraction
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摘要: 为了测量厚度小于0.5mm不溶性液体薄膜的厚度,采用激光衍射法验证了液体薄膜的色散关系,并根据其机理,建立起一种实时、非接触的测量不溶性液体薄膜厚度的方法,测得了薄膜的厚度。结果表明,实验值与理论十分吻合。Abstract: An experimental setup was constructed to measure the thickness less than 0.5mm of the indissoluble liquid film.When the laser falls on the liquid film surface waves,steady and visible diffraction patterns were obtained.Based on laser diffration,the theory of dispersion relations for waves on liquid film surfaces was testified.Subsequently,the thickness of the liquid film was measured carefully.The result shows that the measured thickness corresponded with the actual thickness very wel1.Based on the principle of this experiment,a new method for thickness measurement of indissoluble liquid film is built in a real time and non-contact way.
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Keywords:
- diffraction gratings /
- liquid film /
- dispersion relations /
- surface waves
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