Near-IR Wavefront Sensor - Basic Parameters
| Basic Parameters | |
|---|---|
| Location | Nasmyth focus (IR) |
| Spectral coverage of science path | 0.6-2.4 um |
| Number of control elements | 188 |
| Deformable mirror | Bimorph mirror with 188 control electrodes |
| High-order WFS | NIR Pyramid Wavefront sensor with HgCdTe detector. |
| Control bandwidth | > 100 Hz, 500 to 2000 corrections/sec |
| NGS magnitude | -3 < H < 11 |
| Off-axis steering | 20 arcsec diameter |
| Wavelength range | 0.95-1.8 um (y, J and H-band) |
Modes supported in S24A
SCExAO
The nearIR WFS can be used with the following SCExAO modes :- CHARIS low-red broadband
- CHARIS hi-red J, H or K-band
- CHARIS PDI
- VAMPIRES imaging
- VAMPIRES PDI
- MEC y and J band
- REACH
The nearIR WFS cannot be used with fast polarization imaging (FPDI) FPDI cannot be co-scheduled with nearIR WFS as switching between the two modes required daytime instrument reconfiguration.
IRD
The NearIR WFS cannot be used with standard IRD operation (light extracted within AO188)
REACH operation (light extracted within SCExAO) is supported.IRCS
The nearIR WFS can be used with the following IRCS modes :- 20 mas imaging mode with Y- , J- , H- , and K - band
- Echelle mode with zJ- , J- , H- , and K - band
The nearIR WFS is incompatible with IRCS operation in L and M bands, and is incompatible with IRCS-polarimaetry
Additional Information
- Technical Description page.
- Performance page.
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