Servo control loop using optical feedback

Details Servo control loop using optical feedback Servo control loop using optical feedback

1979-05-02

1981-04-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250235, G01J 120

Patent

active

042648092

ABSTRACT:
In accordance with a presently preferred embodiment of the invention, a servo control loop is disclosed using optical feedback to control the movement of a small, lightweight scanning mirror. The optical feedback is accomplished by reflecting radiation from the scanning mirror and imaging such radiation onto a pair of radiation detectors. An optical element having alternate relatively transparent and opaque regions is disposed in the optical path between the scanning mirror and the detectors to modulate in phase quadrature the intensity of radiation beams received by the detectors. The output signals from the detectors are used to develop a feedback signal to close the servo loop.

REFERENCES:
patent: 4091274 (1978-05-01), Angelbeck et al.
patent: 4097875 (1978-06-01), Scholten et al.
patent: 4127781 (1978-11-01), Sato
patent: 4130838 (1978-12-01), St. John
patent: 4178064 (1979-12-01), Mrdjen

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