Ceta camera support¶

Installation¶

program/package	notes
Tia.dll	(Should come with the microscope)

Program	package web site	local copy of win32 installer
comtypes 0.6.2	http://sourceforge.net/projects/comtypes"	comtypes-0.6.2.win32.exe

Comtypes installation¶

THIS INSTRUCTION IS FOR comtypes 0.6.2. If you install newer version, this may not work.¶

Double click on the installer¶

Modify comtypes¶

IMPORTANT: After installing comtypes, you must make one modification to it. The module "safearray.py" that comes with comtypes must be replaced with a modified version that we provide. You can find the custom version of safearray.py in the pyscope package. Please copy this module from pyscope into the installed comtypes folder: C:\Python2*\Lib\site-packages\comtypes\. It should replace the safearray.py that is included in comtypes.

Remove safearray.pyc in C:\Python2*\Lib\site-packages\comtypes\ if it does not appear to recompile (timestamp of the file change) when you import comtype in python command line

import comtypes

Run checkcom.py¶

• From a command line window:
  

  cd C:\python27\Lib\site-packages\pyscope
  C:\python27\python.exe checkcom.py

The module it finds depends on the module.

You should have

TIA or ESVision

Testing with pyscope¶

In python command

from pyscope import tia
g = tia.TIA_Ceta()
g.setExposureTime(1000)
g.getImage()

You should expect these to run without error. The getImage() command should give a 2D numpy array like

array([[1000, 3400, 2300, ..., 1000,1200,3000],
         [1000, 3400, 2300, ..., 1000,1200,3000],
         [1000, 3400, 2300, ..., 1000,1200,3000],
         ...,
         [1000, 3400, 2300, ..., 1000,1200,3000],
         [1000, 3400, 2300, ..., 1000,1200,3000],
         [1000, 3400, 2300, ..., 1000,1200,3000],dtype=int16)

The number and dtype depends on the camera.

a.shape command should give a tuple of the camera dimension matching your camera.
For example, (4096,4096)

If you use python shell to do this test, some of the error will cause the shell window to close immediately. Use Python IDLE instead in that case

Using Ceta camera in Leginon¶

Leginon does not handle Gain/Dark correction for Ceta camera. It will not use Leginon-collected references even if you acquire them as it will make images worse.

Follow FEI's instruction in obtaining Gain/Dark References in the scope user interface.

Take an single exposure first in its Reference Manager Tab to make sure the intensity range is adequate.