Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1965-06-11
1980-10-07
Jordan, Charles T.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214B, G01J 120
Patent
active
042270766
ABSTRACT:
1. In an optical device for determining the position of a body and including compensation means for the background radiation of the body, the compensation means including two radiation detectors, one responsive to the emission spectrum of the body and the other responsive to the emission spectrum of the background of the body, and having respective outputs supplying respective electric signal potentials corresponding to the radiation effective thereupon with the detector outputs being opposed to each other, and adjusting means operable to change the output of at least one detector prior to initiation of the position determining procedure; the improvement comprising, in combination, a control device for said adjustment means; means applying the difference of the electrical signal potentials to said control device to operate said adjusting means in a direction to balance the detector outputs; and switch means operable, responsive to initiation of the position determining procedure, to deactivate said control device.
REFERENCES:
patent: 2722156 (1955-11-01), Warren
patent: 2803752 (1957-08-01), Warren
patent: 3174045 (1965-03-01), Whitney et al.
Bolkow Gesellschaft mit beschrankter Haftung
Jordan Charles T.
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