Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1974-02-25
1976-11-30
Wilbur, Maynard R.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
250559, 250578, 350175TS, G01P 336
Patent
active
039945839
ABSTRACT:
A method and apparatus for monitoring the speed and travel of a moving article (such as a moving sheet of wood veneer) without contacting the article. The apparatus is stationary relative to such an article, and contains an optical imaging system including spaced coaxial positive lenses, and a cylindrical lens, which cooperate to produce, and to project onto a photodetector, a special distorted image of such an article. The projected image consists of moving elongated bands of light, wherein the speed of movement of the bands, and their travel distance in the image, are directly proportional to the speed and travel distance, respectively, of the viewed article. Further, the lenses in the imaging system are so arranged that the appearance of a projected image is substantially independent of changes, within a predetermined range, in the distance between the apparatus and the viewed article.
REFERENCES:
patent: 2464793 (1949-03-01), Cooke
patent: 3486032 (1969-12-01), Cufflin
patent: 3525569 (1970-08-01), Gamertsfelder et al.
patent: 3612888 (1971-10-01), Boucher
patent: 3820896 (1974-06-01), Stavis
patent: 3822940 (1974-07-01), Goldfischer
patent: 3865487 (1975-02-01), Andermo
Buczinski S. C.
Wilbur Maynard R.
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