Phase-Locked-Loop Adaptive-Optic Controller and Simulated Shear Layer Correction
نویسندگان
چکیده
An alternative adaptive-optic controller, using both flow control and a phase-lock-loop control strategy, has been designed to overcome bandwidth limitations inhibiting current adaptive-optic controllers. A discrete-vortex code and weakly compressible model were used to simulate high-speed shear layer adaptive-optic corrections based upon the proposed phase-lock-loop controller given a range of upper and lowerMach numbers. The shear layer was forced at its origin, creating a region of regularized large-scale structures through which a simulated optical beam was projected. The controller applied a predicted conjugate correction to the shear layer’s emerging wavefront in a feedforward approach. The phase-lock-loop controller produces a sinusoidal signal for which the amplitude and phase are adjusted in real time to synchronize with the reference input. The controller is designed to track abrupt changes in phase or frequency.An overviewof the design process is providedalongwith the alternative adaptive-optic controller’s basic layout and circuitry diagrams. Finally, experimental jitter results illustrate the controller’s amplitude and phase response capabilities given a purely sinusoidal function generator input signal.
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