Method for determining the structure of a body surface
US5982498A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jun 15, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A moving body surface or paper web (1) to be investigated is irradiated at at least one irradiation site by 3 laser light sources of a surface structure measuring device (FOS1, FOS2). Reflected and scattered light is detected and evaluated in order to calculate ellipse points. An ellipse major axis ratio corresponding to a fiber orientation ratio, and a fiber orientation angle are calculated from the ellipse parameters thus obtained. Identical measurements and calculations are carried out periodically on an isotropic sample (NO) and a sample (Nx) having a fiber orientation similar to that of the body surface to be measured, in order to calibrate the measurements at the body surface (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.