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Automatic measurement of surface tension and wetting angle - using optical measurement of drop or bubble illuminated by parallel light
Automatic measurement of surface tension and wetting angle - using optical measurement of drop or bubble illuminated by parallel light
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机译：自动测量表面张力和润湿角度-使用光学测量平行光照射的液滴或气泡
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摘要
Drops or air bubbles of the fluid are illuminated by a parallel beam of light. The intensity of the light reflected back from a background mirror is measured at different positions and the results are processed electronically to compute the surface tension and wetting angle. The computation uses a binary intensity signal generated by passing the direct measurements through a comparator. The level of the comparator threshold is adapted for each set of measurements. Full information is obtained by using both suspended and resting drops or bubbles. The technique is superior to conventional capillary action in that it readily permits automation.
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