Abstract
A method is described whereby a laser beam irradiates the wall of a hollow glass cylinder, and reflections from the inner and outer curved surfaces of the wall interfere to produce a fringe pattern which is analysed to give the wall thickness. The method is dependent on the fact that a curved surface presents an incident laser beam with a continuously varying angle of incidence. A comparison is made with experiment. The method is also applied to a film of water draining down the interior of a vertical cylindrical tube.
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