METHODS AND DEVICES FOR DETEMINING THE CONTACT ANGLE OF A DROP OF LIQUID PLACED ON A SUBSTRATE

摘要

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.