SOFI is the infrared spectrograph and imaging camera on the NTT. The optical layout can be viewed in Figure 1 and Figure 2.
The instrument is equiped with a Hawaii HgCdTe 1024x1024 array with sqared 18.5 micron pixels, sensitive to light within 0.9-2.5 micron range. The peak quantum efficiency is 65 %, the gain is about 5.4 e/ADU, and the read-out-noise is about 2.1 ADU. The array is linear to less than 1.5 % for signal below 10000 ADU.
The instrument offers the following observing modes:
- imaging with plate scales of 0.144, 0.273 and 0.288 arc-seconds/pixel using broad and narrow band filters in the wavelength range 0.9 to 2.5 microns. Click here to check the image quality in the different configurations.
Only the large field mode with the plate scale of 0.288 arc-seconds/pixel is offered as of Period 80.
- low resolution (R=600) and medium resolution (R=1200-1500), 0.93-2.54 micron spectroscopy with fixed width slits of 0.6, 1 and 2 arc seconds.
- 0.9-2.5 micron imaging polarimetry (postscript).
- High time-resolution imaging in burst and fast photometry mode with integration times of the order of a few tens of milliseconds via hardware windowing of the detector array.
|Array Format||Hawaii HgCdTe 1024x1024|
|Pixel Size||18.5 µ|
|Gain||~ 5.4 e/ADU|
|RON||~ 2.1 ADU|
|Bad Pixels||About 1000|
|Non-Linearity||< 1.5% over 0 to 10000 ADU|
|Dark Current||< 0.1 e/s|
See also a brief overview of SOFI's history.
SofI Publication Metrics (Last modiefied 2012-05-13)