Methods and devices for determining the contact angle of a drop of liquid placed on a substrate
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United States of America Patent
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May 26, 1992
Grant Date -
N/A
app pub date -
Apr 5, 1990
filing date -
Apr 6, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to improvements to methods and devices for determining the contact angle of a drop of liquid placed on a substrate. The device comprises: a support 12 for a substrate 11 which receives a drop of liquid 9; a light source 1; optical means, formed for example by a plate with parallel faces 21 rotatable about its axis 22 and whose inclination with respect to the axis may be modified, with a reflecting prism 5a, for forming a primary beam 6a, advantageously annular, striking the interface 8 between drop and substrate; a receiving surface 13a, 13b formed by a reflection diffusing surface; a reflecting surface 17; and a camera C.
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