|
| |
 |
|
Current practice in “adaptive”
optics:
Non-adaptive feedback loop only
Result of this research:
Truly adaptive control loop based on Multichannel
Lattice Filter |
|
 |
f = uncorrected wave front (phase
profile)
e = closed-loop wave front error
c = actuator command
vector |
| u, v
= control command vectors |
| y, s
= Open-loop, closed-loop WFS vectors |
| |
Control
Objective: Minimize variance of e
Optics Objective: Maximize Strehl Ratio |
|
|
Strehl Ratio = Peak Intensity of
Point Spread Function |
| |
|
| Green: |
achievable only with perfect, instantaneous
information |
| Blue: |
adaptive loop closed at t = 2000 |
| Red: |
feedback loop only |
| Black: |
no control |
|
C.-C. Chang and J. S. Gibson, “Parallel control loops based on spatial subband processing for adaptive optics,” in American Control Conference,
(Chicago, IL), IEEE, June 2000.
J. S. Gibson, C.-C. Chang, and B. L. Ellerbroek, “Adaptive optics:
Wavefront reconstruction by adaptive filtering and control,” in 38th IEEE
Conference on Decision and Control, (Phoenix, AZ), IEEE, December 1999.
|
|
