Method and apparatus for measuring depth and hardness

Details Method and apparatus for measuring depth and hardness Method and apparatus for measuring depth and hardness

1993-09-30

1994-10-18

Raevis, Robert

Measuring and testing

Hardness

By penetrator or indentor

G01N 348

Patent

active

053557212

ABSTRACT:
A method and apparatus of measuring the hardness or various other characteristics of a sample surface, comprises a load cell carrying a penetrator and connected to a computer for reading signals from the load cell. The sample is advantageously mounted on the vertically moveable table of a microscope. The table can be moved by a stepper motor also connected to the computer for raising the sample into contact with the penetrator until a preselected force is reached. The force is sufficient to indent the sample surface with the penetrator. Optical or other mechanisms can then be used to measure the indentation. One other mechanism which can be used to measure the indentation is a second load cell carrying a tube which also contacts the sample surface and produces a second signal. Signals from the two load cells can be processed to measure a difference between the signals which provides a measurement of the indentation produced by the penetrator.

REFERENCES:
patent: 3365937 (1968-01-01), Miserocchi
patent: 3406566 (1968-10-01), Livingston et al.
patent: 3877298 (1975-04-01), Narang
patent: 4611487 (1986-09-01), Krenn et al.

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