Method for measuring surface shear stress magnitude and direction using liquid crystal coatings
US5438879A · kind A · utility
33Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Oct 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is provided for determining surface shear magnitude and direction at every point on a surface. The surface is covered with a shear stress-sensitive liquid crystal coating and illuminated by white light from a normal direction. A video camera is positioned at an oblique angle above the surface to observe the color of the liquid crystal at that angle. The shear magnitude and direction are derived from the color information. A method of calibrating the device is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.