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Table 1
Parameters of the S-DIMM+ as installed on the NST.
| Parameters | Comments | |
|
|
||
| Primary mirror diameter, D | 1.6 m | Off-axis telescope: no central obstruction |
| Wavefront diameter on the SH array | 16 mm | |
| Size of SH lenslets | 1 mm | Square lenslets |
| Number of lenslets | 15 | |
| Focal length of SH lenslets | 31 mm | |
| Pixel-size of detector | 7.4 μm | |
| Angular size of a pixel, αp |
|
1 mm/31 mm · 16 mm/1.6 m |
| Wavelength, λ | 0.65 μm | 645–655 nm spectral filter |
| Acquisition frequency | 60 Hz | |
| Exposure time | 0.65 ms | Chosen to use the whole dynamic range |
| of the detector while avoiding saturation | ||
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