- Responsible personnel: Adam
- Date: February xx, 2019
Description of test
Turn on EPICS IOC and get data from screen. Calibrate mm/pixel for each screen.
Test Procedure
Calibration
- Turn on EPICS IOC
- Use ImageJ to connect to camera
- Remove baffles and other covers on camera
- Make sure that viewscreen is inserted
- Focus lens while watching ImageJ
- Adjust aperture on camera so that it is ~1/8th turn from maximally closed. i.e. very little light
- Adjust focusing again, possibly using flashlight to illuminate.
- Save picture that includes screen and assembly that is holding the screen, for later analysis.
- Later, in ImageJ, draw oval around holding assembly and get width and height in pixels
- Make sure that height / width ~ sqrt(2), since the camera is tilted at 45 degrees
- Compare to drawing of viewscreen assembly, and produce calibration number in units of mm/pixel
- Record the calibration number in an elog, and use beamview to enter into EPICS.
- Make sure that autosave records are made properly, such that this value is reloaded when IOC restarts.
Beamview centering and rotation
- Using a flashlight held to one side, make sure that L/R and Up/Down are correct in beamview.
- Use offsets and rotations to center and correctly align the image (center and align the fixture holding the viewscreen.)