Indentation hardness tester

Details Indentation hardness tester Indentation hardness tester

1991-12-16

1992-09-15

Raevis, Robert

Measuring and testing

Hardness

By penetrator or indentor

356378, G01N 348

Patent

active

051467798

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.

REFERENCES:
patent: 4182164 (1980-01-01), Fohey
patent: 4255966 (1981-03-01), Batie
patent: 4312220 (1982-01-01), Borgersen
patent: 4354761 (1982-10-01), Jacoby
patent: 4463600 (1984-08-01), Hobbs et al.
patent: 4653106 (1987-03-01), Yamatsuta et al.

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