Automatic QE

Prerequesite :

On the Unix station near the test bench, after a reboot, you need to setup the testbench (see the HTML page called "Test bench driving").

- Launch the monochromator driver, the ammeter ke6514 driver and the FIERA driver in PRiSM.
- IMPORTANT : The testbench lamp must be turned on since a long time and FIERA online for two hours.

The automatic QE script :

In the CCD acquisition panel, youn can launch the script called "TestQE.pgm" to run the QE measurement.

Parameters :

Clock mode : this is the FIERA CCD clock mode.
Pixels size X, Y : this is the width of a pixel in micron.
Distance measurement : this is the distance of the CCD, comparing to the calibration diode distance.
Distance calibration :this is the distance of the calibration diode, comparing to the CCD distance.

Script progress :

- At First, a dialog box appears :

See the previous paragraph for more informations.

Afterwards, the script ask you the path of the image backup directory. In this directory, every image and graphic wil be saved.

- At the beginning, the script loads the diode reference file and the window transmission file values.

To change the diode reference file and the window transmission file path, you have to edit the script file with an ASCII editor, and replace the previous settting.

"
rem Diode reference file
DiodeRef$="c:\boris\CCD Images (test)\QE\calibrationFile.txt"
rem Window transmission file
WindowT$="c:\boris\CCD Images (test)\QE\WindowTransmission.txt"

- A second step in the process is to calculate the conversion factor (e-/ADU). The script take 2 flat field and 2 bias and try to calculate automatically the exposure time of the flat. If the exposure time is to short (less than 2 seconds), turn down the lamp intensity.

- Then, the script take a flat field for each wavelength value in the diode reference file. At last it can calculate the QE.

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