Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1998-07-28
2000-04-25
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214R, G01J 132
Patent
active
060547022
ABSTRACT:
The COPA accelerometer utilizes a sensing body having a non-zero product of inertia to sense acceleration when spun or oscillated about the y'-axis of an x'-y'-z' Cartesian coordinate system. The sensing body is pivotally attached to a platform and pivots about an axis parallel to the z-axis of an x-y-z coordinate system fixed in the sensing body, the z-axis being in the x'-z' plane. An orientation sensor provides a measure of the average angle between the y-axis and the y'-axis. The orientation sensor contains a laser diode which illuminates a plurality of regions of a photodetector thereby causing photodetector regional currents to flow out of the photodetector. The light intensity of the laser diode is regulated by (a) combining the photdetector regional currents and scaling the result to obtain a scaled total photodetector current, (b) generating a reference current, (c) generating a difference current measure, the difference current measure being monotonically related to the difference of the scaled total photodetector current and the reference current, (d) transforming the difference current measure into a control voltage, and (e) causing the current through the laser diode to vary monotonically with the control voltage.
REFERENCES:
patent: 5665958 (1997-09-01), Rudd et al.
Le Que T.
Litton Systems Inc.
Malm Robert E.
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