Indentation hardness tester
US5146779A · kind A · utility
38Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Dec 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0647
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An indentation hardness tester determines positions of edge points of an indentation and calculates a hardness number from the length of diagonals of the indentation measured from the position of apexes of the indentation. The positions of apexes of the indentation are detected, for example, from intersection points of lines which approximate sides of the indentation. The indentation hardness tester may comprise a bright field/dark field switching part to obtain a clear image of the indentation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.