QC PLOTS
	CURRENT	HISTORY
REFPIX
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 reference pixels of MIDI are the two pixels of the detector onto which the centroids of the target images must fall in order to ensure a proper beam overlap.

MIDI offers different instrument modes (HIGH_SENS and SCI_PHOT). For the HIGH_SENS mode, 2 windows are recorded on the detector, when for the SCI_PHOT mode 4 windows are used. A triple-pinhole is used.

The position of the reference beams (beam A and beam B) are calculated for these 2 modes on the different windows and additionnally for the "OPEN" mode (without the beam combiner).

They are measured by a 2-D gaussian fit using the center of a pinhole. For each mode, each beam and each detector window the pipeline gives the coordinates X and Y.  

Pipeline steps

QC1 parameters

The QC1 parameters recorded in the QC1 database (table midi_refpix) and used for trending are as follow.

Trending

The left plot shows the trending of the position of the X coordinates for the two beams (red and black circles) in the detector window 2 for the HIGH_SENS mode. The same kind of plost are shown for the Y coordinates and all the other modes.

The right image, shows the pipeline product for the SCI_PHOT mode for one of the beam. In each window of the detector (here window1, 2, and 3), there is the image of the triple-pinhole. The coordinates are calculated on the central pinhole. This triple pinhole is one of the MIDI instrument setting, it allows to have simultaneous observations of the object (in the central pinhole) and of the sky (in the two extreme pinholes).

History