Method and apparatus for the measurement of hardness testing ind

Details Method and apparatus for the measurement of hardness testing ind Method and apparatus for the measurement of hardness testing ind

1979-01-18

1981-06-30

Corbin, John K.

Optics: measuring and testing

By polarized light examination

With light attenuation

73 81, 250239, 350 62, 356387, G01B 1122, G02B 2717, G01N 340

Patent

active

042759668

ABSTRACT:
Methods and apparatus are provided for determining the magnitude of hardness testing indentations by scanning the indentations with a light source with or without an external load being applied while the scanning takes place. The intensity of the reflected light from the surface under test is measured utilizing a light-senstive surface surrounding the measuring field. One or more diameters or the entire indentation is scanned and measured to determine the magnitude of the indentations.

REFERENCES:
patent: 2216943 (1940-10-01), Hanemann
patent: 2311101 (1943-02-01), Tuttle et al.
patent: 2491667 (1949-12-01), Kent
patent: 3776995 (1973-12-01), Little, Jr.
patent: 3822946 (1974-07-01), Rynkowski
patent: 4078858 (1978-03-01), Mast
patent: 4112309 (1978-09-01), Nakazawa et al.
patent: 4147052 (1979-04-01), Tsujiuchi et al.

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