Process and device for inspecting and checking the internal surf

Details Process and device for inspecting and checking the internal surf Process and device for inspecting and checking the internal surf

1981-05-28

1984-04-03

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

356355, G01N 2188

Patent

active

044404964

ABSTRACT:
A process for inspecting and checking the internal surface of a hollow cylindrical workpiece which has undergone mechanical working, particularly finishing by grinding or the like following which the internal surface has two sets of intersecting, helical score lines, consists in the examination of the diffraction pattern generated by laser radiation incident normally on the internal surface of the workpiece, so as to obtain a series of indications related to the characteristics of the two sets of intersecting helical score lines. The device for carrying out the process includes, as well as means for detecting the said diffraction pattern, means for providing an indication of the degree of roughness of and the presence of possible surface defects on the internal surface of the workpiece.

REFERENCES:
patent: 3749496 (1973-07-01), Hietanen et al.
patent: 3761186 (1973-09-01), Wason
patent: 4055382 (1977-10-01), Ziekman et al.
patent: 4124300 (1978-11-01), Mead et al.

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