Hardness tester

Details Hardness tester Hardness tester

1977-08-17

1979-04-03

Ciarlante, Anthony V.

Measuring and testing

Hardness

By penetrator or indentor

G01N 342

Patent

active

041470524

ABSTRACT:
A hardness tester has an image sensor and a detecting system. The image sensor has aligned plurality photoelectric sensor elements on an image plane on which a bright and dark image of an indentation is formed through an optical system. The detecting system detects the diagonal length of the indentation by using the differences in amplitude of the output signals developed by the sensor elements in the vicinity of the ends of the indentation image.

REFERENCES:
patent: 2713259 (1955-07-01), Grodzinski et al.
patent: 3737856 (1973-06-01), Lehrer et al.
patent: 3739630 (1973-06-01), Llop
patent: 3822946 (1974-07-01), Rynkowski

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