Method for mitigating 2.pi.N ambiguity in an adaptive optics con

Details Method for mitigating 2.pi.N ambiguity in an adaptive optics con Method for mitigating 2.pi.N ambiguity in an adaptive optics con

1979-08-30

1981-06-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250205, G01J 120

Patent

active

042713552

ABSTRACT:
A method of mitigating 2.pi.N phase ambiguity in an adaptive optics control system is disclosed wherein the radiation sensed by a detector within a feedback loop is passed through an aperture having a variable diameter. The turn-on of the adaptive optics control system is initiated with the aperture in an open position to transmit radiation from all actuator zones onto the detector resulting in a convergence free of the 2.pi.N phase ambiguity. The diameter of the aperture is then reduced slowly compared to the bandwidth of the control system to converge to a near diffraction limited output beam at the aperture.

REFERENCES:
patent: 3979585 (1976-09-01), O'Meara
patent: 3988608 (1976-10-01), O'Meara

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