Methods and devices for determining the contact angle of a drop of liquid placed on a substrate
US5115677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Apr 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2013/0241
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.