Calibration Quality

This means you want to make sure your modulation matrixes are not singular.

1. Go to ssh -X store1 then cd polcal from any control computer.
2. Run ./polcal logfile on your SOUP camera logfile
3. Do NOT File $\rightarrow$ Open /data/... /logfile if you have observed in the same directory, unless you have a lot of time on your hands and nothing better to do! (listing the directory with Sarnoff data takes a lot of time due to the large number of files)
4. Double click with left mouse button inside the top left window.
5. Select the first calibration sequence (LP angle 0$^\circ$, no 0).
6. The related 5 darks and 5 images should be selected automatically in the 2 bottom parts of the window. But not always, so check the image numbers from your calibration schedule and select the 5 darks and 5 images that belong to the sequence you want to investigate.
7. Press the OK button.
8. After loading the files, you should see 4 curves in the top display.
9. Solid lines correspond to the initial modulation matrix specified in a config file (polcal.cfg) and circles correspond to the measured calibration data.

   If you didn't make any changes to the hardware, the curves should show clearly different modulation, in which case your matrix should be fine (i.e. not singular, not necessarily efficient though). So the calibration you did for LP angel 0$^\circ$ is ok. But you should of course check all 8 LP angles covered during calibration. So continue at:

10. Double click with left mouse button inside the second window row left window.
11. Select the second calibration sequence (LP angle 45$^\circ$, no 2).
12. Double click with left mouse button inside the third window row. left window.
13. Select the second calibration sequence (LP angle 90$^\circ$, no 1). And so on...

Angles $< 180^\circ$ should be loaded on the left, angles $\ge 180^\circ$.