Electro-optic space positioner with background compensator

Details Electro-optic space positioner with background compensator Electro-optic space positioner with background compensator

1988-04-18

1989-06-20

Levy, Stewart J.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

356141, 250214B, G01M 500

Patent

active

048400696

ABSTRACT:
The output of a diode array undergoes A/D conversion. A constant digital value is added to the output when remote light sources remain de-energized to establish an ambient threshold level. The remote sources are then energized; and when a digital array output signal is sensed at a level exceeding the threshold, the positive existence of a sensed source is established. The invention has application in the measurement of aircraft wing vibration.

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IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, pp. 1935-1936.

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