The V2 Level 0 data are processed into fringe amplitudes and other
necessary information by a program called Kvis (see the data reduction manual
for
details). This processing is done automatically at the end of each
observing night. At the output of this reduction we obtain Level 1 data,
i.e. fringe data that have been corrected for detector biases
and averaged, but not yet corrected for the system visibility. The
Level 1 data are contained in a group of files, described in detail in
the links
below. The primary data
files are called .sum and .spec files which contain the wideband (or
white light) and narrow band data respectively. The prefix for Level
1 files is the UT observation date in the form yyyyddd. In
addition to the fringe amplitudes, these files contain other
information (delay line positions, time, etc.) needed to calibrate the
data for the system visibility (by the programs wbCalib and nbCalib as
described below). In addition, there are files which
contain other instrument information such as the baseline (.baseline),
as well as
ancillary data (.anc) from various sub-systems (e.g. angle tracker and
adaptive optics systems). The nulling data are also
processed through a pipeline to produce Level 1 files,
see below.
Once the KI user has obtained his/her Level 1 data for science
targets and corresponding calibrators, the programs wbCalib and nbCalib (for V2 data)
take these files as
input in order to produce fully calibrated Level 2 data. At this time,
KI users must calibrate their own data, a task that is greatly
simplified if making use of our calibration packages, which may be
obtained from our software
download page.
All PIs of a KI observing program have an account created when their
data are obtained,
please contact your contact scientist with if you are a KI PI and do
not know how to access your web data account.
Non-PI users will be allowed to obtain KI data as it becomes public
by obtaining a public account to our web access tool.
The KI operates in a variety of modes.
The KI data is tagged so that data for a given mode can be identified
and accessed. The modes currently under operation, and their
corresponding mode tags are as follows:
| KI
Mode |
Mode Name |
| Visibility amplitude
in the near-infrared |
NIRV2 |
| Nulling
(mid-infrared) |
Nulling |