MIDI Quality Control

MIDI:
PROFILE of the MIDI Spectra

QUALITY CONTROL HOME
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GENERAL

One of MIDI recipe (midi_profile) is used for several puposes.

When used on a large number of photometry file the resulting product is a mask profile. This is run for the GRISM each 6 months and for the PRISM around once a month.

When used on only the photometry files associated to an OB, 2 different types of QC parameters are monitored:

the vertical postion of the spectrum QC.CENT.Yx
the maximum intensity in the center of the spectrum

Mask calculation

The mask applied to the interferometric and photometric data is recalculated to insure that the mask is still centered on the signal. These masks calculated with the midi_profile recipe are compatible with the pipeline and the off-line DRS MIA/EWS.

Position of the spectrum

Since the beginning of MIDI operations, the PRISM is slowly tilting inside the instrument. The vertical position of the spectrum for the PRISM is shifting down by around 1 pixel each yer. This needs to be monitored until a solution is found (change of the PRISM). The QC parameters are given for 5 different binned wavelength. The bin3 (around 10.46 microns) is shown in the HC plots

for the position of the PRISM spectrum since 2005

History

2010-06-16 The readout window has been shifted upward by 7 pixels for the PRISM to compensate for the drift and bring the spectrum back to the center of the detector.

Spectrum width

The spectrum width is also calculated by the recipe and the intensity at the center of the spectrum is given for several wavelength (QC.Y1.MAXSUM.BINx). VLTI is sometimes affected by vibrations of one of the telescope. In this case the spectrum is wider in the vertical direction and the maximum intensity dropped down. This is monitored in the HC:

Intensity in the center of the spectrum

The reference intensities are :

Mode	Dispersion	from	to	win1	win2	win3	win4
HIGH_SENS	PRISM	2009-05-10	2009-09	3.209	3.216
		2009-07-01	2009-09	3.216	3.189
		2009-09	2009-09	3.149	3.119
	GRISM	2006-05	2009-09	7.108	7.209
SCI_PHOT	PRISM	2009-04-19	2009-09	3.029	3.061	3.111	3.063
		2009-07-01	2009-09	3.057	3.026	3.197	3.124
		2009-09	2009-09	3.079	3.414	3.496	4.038
	GRISM	2007-04-22	2009-09	5.212	7.568	7.614	7.198