Quality Control and
Data Processing

HC PLOTS
Shift
QC1 database (advanced users): browse | plot

The shift map provides the distorsion and dispersion calibration laws. The measurement is made using plastic foils which provides a good estimate of the WL to pixel relation at low spectral resolution. For higher resolution, this measurement is not accurate enough and the fine spectral calibration is performed by means of sky measurements which are systematically recorded during the scientific observations.

The input data contains a series of images containing the laboratory background for each pinehole and for the slit (DISTOR_HOTDARK and SPECTRA_HOTDARK), a serie of images of the three pinholes (DISTOR_IMAGES), a serie of spectral images (SPECTRA_IMAGES), the static bad pixel map (BADPIX), the static nonlinearity map (NONLINEARITY) and the observation specific flatfield map (OBS_FLATFIELD).

Due to the different optical paths, the photometrics and interferometric channels are not aligned in spectral and spatial directions. The optical elements produce different distorsions in the different channels.
This plugin calculates the distorsion coefficients of the photometric and interferometric channels, and it determines the relative shifts between each photometric channel and the interferometric one.
The input data are:

• a series of images containing the laboratory background for each pinehole and for the slit (DISTOR_HOTDARK and SPECTRA_HOTDARK),
• a series of images of the three pinholes (DISTOR_IMAGES),
• a series of spectral images (SPECTRA_IMAGES),
• the observation specific flatfield map (OBS_FLATFIELD),
• the static calibrations BADPIX, NONLINEARITY

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.DET..PICOV1	matisse_shift..cov_shift_intphot1	relative coverage of the interferometric channel by the photometric channel 1	HC		[docuSys coming]
QC.DET..PICOV2	matisse_shift..cov_shift_intphot2	relative coverage of the interferometric channel by the photometric channel 2	HC		[docuSys coming]
QC.DET..PICOV3	matisse_shift..cov_shift_intphot3	relative coverage of the interferometric channel by the photometric channel 3	HC		[docuSys coming]
QC.DET..PICOV4	matisse_shift..cov_shift_intphot4	relative coverage of the interferometric channel by the photometric channel 4	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The QC parameters cov_shift_intphot for the 4 different photometric channels and the defferent setup are shown in the trending plots.

Scoring&thresholds detector shift

The HC plots are not scored. For the individual AB, the thresholds values are set to detect jumps

History

The evolution of the shifts will be shown under "FULL" once more data have been accumulated.

Algorithm detector shift

The recipe used is mat_est_shift.

• The static calibrations are applied on the input data to remove the reference subwindow, the badpixels, correct for non linearity and flatfield,
• the frames of the corrected input files are summed for each region
• the distorsion coefficients and the spectral shifts are calculated