| 摘要 |
The present application relates to a contact angle measurement apparatus comprising a liquid reservoir arrangement (35), at least one drop dosing device (30) in fluid communication with the liquid reservoir arrangement (35) and adapted for applying a drop (8) of a liquid stored in the liquid reservoir arrangement (35) onto a surface (6) of a sample body (7), an illuminating device (20) adapted 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, and an image recording device (10) adapted for recording an image of each applied drop (8) disposed on the surface (6) in side view from a second side opposite the first side. Each drop dosing device (30) comprises a liquid line (31), which comprises an outlet (32) and a valve (38), and which is adapted to guide a liquid stored in the liquid reservoir arrangement (35) towards the outlet (32) and out of the outlet (32) onto the surface (6). The apparatus further comprises a liquid pressurizing system (37) adapted to pressurize liquid from the liquid reservoir arrangement (35), and a controller (39) connected to the valve (38) of each drop dosing device (30) and to the liquid pressurizing system (37) and adapted to control the operation of the liquid pressurizing system (37) and, for each drop dosing device (30), opening and closing of the respective valve (38) to apply a drop (8) of the respective liquid from the respective liquid line (31) to the surface (6) in a jet of pressurized liquid, wherein for each drop dosing device (30) the controller (39) and the valve (38) are adapted such that the jet applies the liquid to the surface (6) with a flow rate of 45 µl/s or less. |
