Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-03-23
1996-11-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502031, 2502036, 250332, G01C 2102, G01J 142
Patent
active
055742750
ABSTRACT:
An optical sensor and a method of operating an optical sensor. The optical sensor includes a plurality of unit cells, a plurality of groups of optical detectors, an amplifier and a plurality of selection circuits. Each of the unit cells includes at least first and second pixels, and each group of optical detectors is associated with a respective one of the unit cells. Each group of detectors includes at least first and second detectors to generate first and second electric signals representing the intensity of light incident on, respectively, the first and second pixels of the associated unit cell. Each of the selection circuits is associated with a respective one of the groups of detectors for transmitting to the amplifier the electric signals from the associated group of detectors. Also, each selection circuit has first and second modes for conducting to the amplifier, respectively, either the electric signal from only the first detector of the associated group of detectors, or the electric signals from both the first and second detectors of that associated group of detectors. By switching the selection circuit between the first and second modes, the sensor may operate at either a course resolution or a fine resolution. Thus, by combining electronic switching and summing of detector elements, a single array of detectors can function in both course and fine resolution modes.
REFERENCES:
patent: 4675532 (1987-06-01), Carson
patent: 4814629 (1989-03-01), Arnold
patent: 5293036 (1994-03-01), Norton
patent: 5304790 (1994-04-01), Arnold
Durst David I.
Hayman Patrick L.
Klop Martin
Anderson Terry J.
Hoch Jr. Karl J.
Lee John R.
Northrop Grumman Corporation
Westin Edward P.
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