Apparatus for determining the surface roughness of a material

Details Apparatus for determining the surface roughness of a material Apparatus for determining the surface roughness of a material

1989-10-06

1991-05-14

Noland, Tom

Measuring and testing

Surface and cutting edge testing

Roughness

73159, 73587, G01B 1700, G01B 2130, G01N 2914

Patent

active

050145479

ABSTRACT:
An apparatus for determining the surface roughness of a material comprised of an acoustic element which is pivotally mounted to a support structure containing a polished end which is maneuvered into contact with the surface of a material to be tested by a spring element. The material is caused to move relative to the acoustic element by a driven roller. A transducer is acoustically coupled to the acoustic element and detects stress waves propagating in the acoustic element as a result of frictional and impact force generated by the rubbing of the acoustic element with the material. The relative stress wave activity is dependent upon the surface roughness of the material. A processor analyzes an electrical signal produced by the transducer to determine the surface roughness of the material which may analyze the electrical signal produced by the transducer to determine the presence of impurities on the surface of the material.

REFERENCES:
patent: 2752781 (1956-07-01), Thorsen
patent: 2896196 (1959-07-01), Hartford et al.
patent: 3037381 (1962-06-01), Grant et al.
patent: 3164015 (1965-01-01), Schafer
patent: 4448062 (1984-05-01), Peterson et al.
patent: 4538463 (1985-09-01), Pease
patent: 4541278 (1985-09-01), Marsh et al.
patent: 4563897 (1986-01-01), Moor
patent: 4819994 (1989-04-01), Holroyd

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