IFS spectra position raw frame is acquired in IFU mode and shows broad
band lamp spectra (an IFU flat field) to determine the identification and
position of the spectra. The recipe generates one product with different
extensions. Further recipes of the calibration cascade essentially append
more and more extensions to this product with additional information
IFS spectral position raw frame.
IFS spectral position raw frame. Zoomed version
Zoom into extension "PDT.WAVELENGTH" of the IFS spectral position product, showing position of the spectra and the initial wavelength range.
correcting scale to fit the lenslet model and the SPOS calibration slitlet center point pattern.
The pixel offsets as a function of the optical bench temperature. The solid lines are empirical non-linear relations. The dashed line is the empirical relation before the earth quake in 2015-11 and shows the shift by 0.6 pixel introduced by this event.
The pixel offset in x between the SPHERE IFS spectra positions of the raw input frame and the lenselet model.
The pixel offset in y between the SPHERE IFS spectra positions of the raw input frame and the lenselet model.
There was a 6.2 mag earth quake on 2015-11-27, which caused a shift of the OFFSET_X values by 0.6 pixel. The non-linear relation between the offset and the optical bench temperature before the EQ event is shown as a dashed line, the post EQ empirical relations are shown as solid lines and are:
2017-04-05: The processing strategy was modified. SPOS calibrations are no longer processed using a IFS master dark. As a consequence the pipeline reports a different number of found spectra.
2018-10-26T12: 'NO RISK' earthquake at 2018-10-26T12:31:07 introduced a huge offset in the spos values.