| 摘要 |
The present application relates to a contact angle measurement apparatus for measuring a contact angle between a surface (6) of a solid sample body (7) and at least one drop (8) of sample liquid disposed on the surface (6). The apparatus comprises at least one drop dosing device (30) adapted and arranged for applying a drop (8) of a liquid onto a surface (6) of a sample body (7), an illuminating device (20) adapted and arranged for illuminating each drop (8) applied by the at least one drop dosing device (30) and disposed on the surface (6) from a first side of the at least one drop (8), and an image recording device (10) adapted and arranged for recording an image of at least a transition region between the surface (6) and each drop (8) applied by the at least one drop dosing device (30) and disposed on the surface (6) in side view from a second side of the drop (8) opposite the first side. The illuminating device (20) comprises a light-emitting arrangement (21) which, when viewed by the image recording device (10), provides a two-dimensional light field (60). The contact angle measurement apparatus further comprises a controller (39) connected to the illuminating device (20), wherein the controller (39) and the light-emitting arrangement (21) are adapted such that at least one dimension of the light field (60) is selectively adjustable by the controller (39). |
