Open Access
Table 1
Parameters of GPAO wavefront sensors associated with their corresponding AO mode.
| Parameter | LGS | NGS VIS HO | NGS VIS LO | NGS IR HO | NGS IR LO |
|---|---|---|---|---|---|
| Camera | OCAM2 | OCAM2 | Saphira | ||
| Nb. of pixel read | 240 × 240 | 240 × 240 | 72 × 72 | ||
| Pattern of subap | 30 × 30 | 40 × 40 | 4 × 4 | 9 × 9 | |
| Nb. of subap | 704 | 1240 | 12 | 68 | |
| Plate scale [″/pix] | 0.71 | 0.42 | 0.21 | 0.51 | |
| Frame rate [Hz] | 1000 | 1000,500,250,100 | 500,250,100 | 1000,500,200,100 | 500,200,100 |
| Controlled KL modes | 4–500 | 500,200 | 3 | 50 | 3 |
| Modal controller | Implicit | Implicit | Explicit | Implicit | Explicit |
| is active in mode: | |||||
| NGS_VIS | ✓ | ||||
| NGS_IR | ✓ | ||||
| LGS_VIS | ✓ | ✓ | |||
| LGS_IR | ✓ | ✓ | |||
Notes. In terms of hardware, the NGS VIS HO/LO wavefront sensors only differ by the setting of the NHILO lenslet. In terms of hardware, the NGS IR HO/LO wavefront sensors are identical.
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