Electro-optical gaging system having dual cameras on a scanner

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Details

364469, 72 37, B21B 3700, G06F 1546

Patent

active

041212924

ABSTRACT:
Computerized electro-optical system gages two orthogonal dimensions of a moving hot bar at various peripheral positions. Dual back-light electronic camera heads mounted 90.degree. apart on a scanner generate high-speed bar shadow pulses which represent the bar dimensions. Bar pulses are processed by way of individual camera electronics and a digital computer. CRT and printing terminals, interacting with the computer, indicate and/or record each cold-size bar diameter measurement, a plot of bar profile deviation from aim gage overlaid on full- and half-commercial tolerance references with a data header, and a gaging system histogram.
Each camera head electronics includes camera AGC circuit, a digital type one-axis bidirectional linear sweep, bar pulse edge-detection with an autocorrelator to remove noise and enhance the bar pulse, and a digital accumulator of digital bar size signals and digital bar position-in-field-of-view signals. The digital computer assimilates each bar size and bar position digital signal along with scanner position, bar temperature and other data signals. The computer is programmed to: (a) compensate each bar size signal for field-of-view errors and other optical and electronic nonlinearities, bar temperature and other sources of error; (b) calibrate the gage off-line and automatically recalibrate the gage on-line to correct for drift and slope errors; (c) automatically drive the scanner and implement incremental digital storage of corrected bar size signals for bar profile plotting; (d) perform gaging system histograms; and (e) communicate with the CRT and printing terminals and an exterior control system.

REFERENCES:
patent: RE27370 (1972-05-01), McNaugher
patent: 3052809 (1962-09-01), Bahring et al.
patent: 3676652 (1972-07-01), Millis, Jr. et al.
patent: 3686437 (1972-08-01), Leonard
patent: 3713313 (1973-01-01), Spradlin
patent: 3761182 (1973-09-01), Kubisiak et al.
patent: 3854822 (1974-12-01), Altman et al.
patent: 3874798 (1975-04-01), Antonsson et al.
patent: 3894259 (1975-07-01), Webb
patent: 3902811 (1975-09-01), Altman
patent: 3907439 (1975-09-01), Zanoni
patent: 3968681 (1976-07-01), Cornforth et al.
"By Continuously Measuring the Dimensions of Rods and Bars, Expensive Loss of Stock Can be Avoided", AGA Electronics Div., Product AGA Diameter, Lidingo, Sweden, 1974, 511001, 8 pp.

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