Table 3
RMS of the slopes (WFS signals) computed on the sets of turbulence residual (i.e., partial correction) samples used to compute the SIMPCs (see Sect. 2).
| Sub-ap. | Seeing (arcsec) | |||||
|---|---|---|---|---|---|---|
| size (m) | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 |
| rmod = 0λ/D | ||||||
| 0.2 | 0.220 | 0.267 | 0.296 | 0.315 | 0.329 | 0.337 |
| 0.4 | 0.243 | 0.270 | 0.284 | 0.291 | 0.291 | 0.287 |
| 0.6 | 0.303 | 0.314 | 0.311 | 0.302 | 0.292 | 0.283 |
| 0.8 | 0.343 | 0.332 | 0.311 | 0.299 | 0.290 | 0.283 |
| rmod = 3λ/D | ||||||
| 0.2 | 0.221 | 0.231 | 0.250 | 0.271 | 0.292 | 0.306 |
| 0.4 | 0.215 | 0.233 | 0.253 | 0.265 | 0.270 | 0.270 |
| 0.6 | 0.255 | 0.277 | 0.283 | 0.283 | 0.279 | 0.274 |
| 0.8 | 0.285 | 0.296 | 0.292 | 0.287 | 0.282 | 0.278 |
Notes. PWFS with and without modulation, infinite S/N, and different seeing and sub-aperture size values are considered. The turbulence residual has two opposite effects: it increases amplitude of signal to be measured (larger RMS) and it reduces the optical gain of the PWFS (smaller RMS, see Sect. 3). Refers to the 8 m-telescope case.
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