Optics: measuring and testing – By configuration comparison – With comparison to master – desired shape – or reference voltage
Patent
1984-01-04
1985-10-01
Rosenberger, R. A.
Optics: measuring and testing
By configuration comparison
With comparison to master, desired shape, or reference voltage
356398, 356237, G01B 1124, G01B 1130
Patent
active
045442681
ABSTRACT:
A method and an apparatus for detecting a flaw on threads of a male screw, which comprises: fully applying a light from a light source onto tops, roots and flanks of threads of a male screw while rotating the male screw around the axis thereof; continuously measuring, by means of a photoelectric converter, electric signal values corresponding to variations in brightness of the male screw in the axial direction thereof during one turn of the male screw around the axis thereof; moving-averaging the thus measured electric signal values corresponding to the variations in brightness of the male screw in the axial direction thereof; determining electric signal values corresponding to variations in brightness of the male screw in the circumferential direction thereof, on the basis of the thus moving-averaged electric signal values corresponding to the variations in brightness of the male screw in the axial direction thereof; obtaining a mean square value of the thus determined electric signal values corresponding to the variations in brightness of the male screw in the circumferential direction thereof; and comparing the thus obtained mean square value with a previously set reference value to detect a flaw on the threads of the male screw.
Okamura Masaru
Uesugi Mitsuaki
Yamada Takeo
Nippon Kokan Kabushiki Kaisha
Rosenberger R. A.
Vollero Michael
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