Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1974-12-03
1976-03-30
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356160, 250560, G01B 1102
Patent
active
039471306
ABSTRACT:
Apparatus for measuring a dimension of a specimen whose image is projected by an optical system into a television camera or other light scanner, by forming the ratio of the time required to scan across the unknown dimension, with the time required to scan across the image of a reference dimension. The reference dimension is the width of an object placed in a focal plane of the optical system other than the focal plane in which the specimen having unknown dimension to be measured is placed.
In a preferred embodiment, the apparatus includes a variable frequency oscillator which performs the measurements for the times required to scan these two dimensions. A feedback loop adjusts oscillator frequency so that the number of oscillations during the scan of the reference object equals the number stored in a register which can be altered only manually. This preferred embodiment can be calibrated by placing an object of known dimension within the field of view reserved for the specimen. Oscillator frequency is adjusted by manually varying the contents of the manually alterable register until the number of cycles occurring during a scan across the known dimension is a selected power of 10 of the value of the known dimension. The oscillator frequency is automatically adjusted thereafter by the feedback loop to maintain the number of oscillations equal to the contents of the manually alterable register during subsequent reference object scans. The number of cycles which occur during a scan across a specimen multiplied by the selected power of 10 is the dimension of that specimen.
REFERENCES:
patent: 3546377 (1970-12-01), Troll
patent: 3758214 (1973-09-01), Mangelsdorf
Control Data Corporation
Corbin John K.
Punter Wm. H.
Schwarz Edward L.
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