Automatic exposure control for a luminous object monitor system

Details Automatic exposure control for a luminous object monitor system Automatic exposure control for a luminous object monitor system

1976-05-17

1977-07-05

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250201, 250560, 356167, G01J 120, G01B 1100, G01B 1104

Patent

active

040336972

ABSTRACT:
A system for measuring a dimension, such as the width, of a hot strip of material on line, particularly steel and glass. The system utilizes two arrays of light sensitive electronically scanned detectors, placed above the hot strip and spaced apart at a distance to permit viewing each edge. Each sensor images the hot strip onto the array of photo sensitive detectors. Using visible and infrared radiation of the hot strip as the energy to expose the detectors, position information of each edge is determined and electronically added to the fixed dimension between the two sensors resulting in a value equal to the total width. The measurement is automatically updated many times per second, as the occasion demands. In order to compensate for varying temperatures of the hot material, the system employs an automatic exposure control which varies the time required to complete a scanning cycle of the electronic detectors in response to changes in the intensity of the lumination of the object to thereby vary the exposure to the detectors.

REFERENCES:
patent: 2931917 (1960-04-01), Beelitz
patent: 3193681 (1965-07-01), Schwarz
patent: 3501623 (1970-03-01), Robinson
patent: 3589813 (1971-06-01), Sturzinger
patent: 3736063 (1973-05-01), Ohno et al.

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