QC PLOTS
	CURRENT	HISTORY
spectrum position
spectrum height
QC1 database (advanced users): browse | plot
Click on CURRENT to see the current trending (Health Check).    Click on HISTORY to see the historical evolution of the trending.

The recipe midi_profile is applied to chopped PHOTOMETRY frames. For each window on the detector (Data1, Data2 for HIGH_SENS) and Data1 to Data4 for SCI_PHOT, a profile is identified and a mask is created. The recipe calculates the y position of the mask and the maximum intensity of the normalized profile in 5 different bins.

The recipe midi_profile can also be used on a large number of photometry files to produce a master mask profile.

QC1 parameters

• Spectrum position: 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 year. The QC parameters are given for 5 different binned wavelength. The bin3 (around 10.46 microns) is shown in the HC plots.
• Spectrum height: 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 drops down.

History

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

Reference intensities from the past have been:

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