Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1979-08-08
1982-02-16
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356378, 356394, 356398, 356430, 356241, 356237, G01B 1122, G01B 1104
Patent
active
043156886
ABSTRACT:
Method and apparatus for inspecting threaded objects and for determining the depth of blind holes. For inspecting threads, a light source is provided for illuminating threads of a threaded object. A lens forms an image of the illuminated threads. A detector having a light sensitive area sufficiently small to resolve the thread image is provided to detect the image and an output signal is produced in response to the incident image light. The output signal is analyzed to determine the quality of the threads. For determining the depth of a blind hole, a light source forms a spot on the bottom of a blind hole in an object and the lens forms an image of the spot. Means are provided to detect the spot image to produce an output signal responsive to the incident image light. Means are provided to analyze the output signal to determine hole depth.
REFERENCES:
patent: 3061731 (1962-10-01), Thier et al.
patent: 3404282 (1968-10-01), Walker
patent: 3667846 (1972-06-01), Nater et al.
patent: 3741656 (1973-06-01), Shapiro
patent: 3890049 (1975-06-01), Collins et al.
patent: 3924953 (1975-12-01), Allard
Diffracto Ltd.
McGraw Vincent P.
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