Hardness testing apparatus

Details Hardness testing apparatus Hardness testing apparatus

1979-11-30

1981-03-17

Myracle, Jerry W.

Measuring and testing

Hardness

By penetrator or indentor

73 85, G01N 348

Patent

active

042559669

ABSTRACT:
Hardness testing apparatus, for use in assessing dimensions, from which a hardness value can be determined, of an indentation formed under controlled conditions in a surface of a specimen, having a photosensitive detector for sensing brightness over an image in which the indentation differs in brightness from the rest of the image. The detector produces electrical signals representative of sensed brightness. Discrimination circuitry discriminates signals representative of brightness within the indentation from signals representative of brightness outside the indentation. Correlation of discrimination results provides an assessment of indentation dimensions. Preferably oblique lighting is used to provide enhanced brightness differentation between a multifaceted indentation and other specimen surface features. The oblique light is directed so as to be specularly reflected from a facet of the indentation vertically with respect to the general specimen surface.

REFERENCES:
patent: 3754436 (1973-08-01), Saxton
patent: 3822946 (1974-07-01), Rynkowski
patent: 4147052 (1979-04-01), Tsujiuchi et al.

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