Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-09-13
1989-10-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356376, G01N 2186
Patent
active
048779709
ABSTRACT:
A process for measuring the contour configuration of an article defined by numerous cylindrical surface portions, is disclosed, which process comprises placing the article on a turntable, irradiating parallel light beams upon one side portion of the article while rotating the turntable, detecting changes, as a function L(.theta.) by means of a light-receiving member, in locations L at which the parallel light beams are interrupted by the article, said .theta. denoting a rotational angle of the turntable, inputting data of L(.theta.) thus detected into a memory of a computer, calculating a value of L(.theta.)+L(.theta.180.degree.), comparing the thus calculated value with that for an ideal contour configuration, and correcting deviations in a position and angle of the article. Thereby, a correct measured value is obtained.
REFERENCES:
patent: 3566135 (1971-02-01), Mouchart
patent: 3907438 (1975-09-01), Holeman
patent: 4064534 (1977-12-01), Chen et al.
patent: 4122525 (1978-10-01), Eaton
patent: 4290285 (1981-11-01), Ito
patent: 4298034 (1981-10-01), Ito et al.
Minamikawa Masayasu
Onabe Yoshiaki
Ono Masanao
Chatmon Eric F.
Nelms David C.
NGK Insulators Ltd.
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