Update Controls
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Controls.md
56
Controls.md
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[Home page](ptychoScopy)
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List of controls consists of all parameters needed for proper dataset acquisition design. These are taken from calibration file **calibrations.xlsx** and may differ microscope to microscope. They are divided accordingly to their main influence (some of them may affect several features).
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##### Electron beam settings
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- **Energy** energy of primary electron beam in keV
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- **Probe** probe setting together with chosen probe forming aperture give probe
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current
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- **Defocus** moves focus out of the sample plane - enlarges beam diameter
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- **Aperture** probe forming aperture gives probe semi-angle (α)
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##### Scanning parameters
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- **Magnification** controls image field of view
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- **Matrix** gives beam position to position distance + beam defocus = beam overlap
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- **Dwell time** single position beam time
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##### Detection
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- **Nominal CL** sample to detector distance (usually ADF) gives maximal detected angle as well as angular sampling
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- **Detector** detector used for data collection
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- **Use PAAR** Pumping Aperture Angular Restriction, build-in aperture may limit maximal scattering angles for shortest camera lengths
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- **Binning** reduction in pixel array size usually increases maximum frame rate
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##### CL guide - build in checks for proper camera length selections for iterative reconstruction
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- Low angle approximation - scattering angle < 10deg (unequally sampled pixel around optical axis and around detector edge)
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- Ptycho pixel < step size - set step size is smaller than final pixel in reconstructed image - loose of resolution
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- Beam fits in probe window - probe window is capable to accommodate for defocused probe
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- Detector cover < 1α - no reconstruction method for such a dataset
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- Detector cover > 6α - usually no scattering beyond 5α
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Always carefully check maximal detector frame rate, needed binning and set dwell time!!
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[Home page](ptychoScopy)
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List of controls consists of all parameters needed for proper dataset acquisition design. These are taken from calibration file **calibrations.xlsx** and may differ from microscope to microscope. They are classified by their dominant impact, with potential overlaps (some of them may affect several features).
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##### Electron beam settings
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- **Energy** energy of primary electron beam in keV
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- **Probe** probe setting together with chosen probe forming aperture give probe
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current (in two condenser lens system)
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- **Defocus** moves focus out of the sample plane - enlarges beam diameter
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- **Aperture** probe forming aperture gives probe semi-angle (α)
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##### Scanning parameters
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- **Magnification** controls image field of view
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- **Matrix** gives beam position to position distance + beam defocus = beam overlap
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- **Dwell time** single position beam time
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##### Detection
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- **Nominal CL** sample to detector distance (usually ADF) gives maximal detected angle as well as angular sampling
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- **Detector** detector used for data collection
|
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- **Use PAAR** Pumping Aperture Angular Restriction, build-in aperture may limit maximal scattering angles for shortest camera lengths
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- **Binning** reduction in pixel array size usually increases maximum frame rate
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##### CL guide - build in checks for proper camera length selections for iterative reconstruction
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- Low angle approximation - scattering angle < 10deg (unequally sampled pixel around optical axis and around detector edge)
|
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- Ptycho pixel < step size - set step size is smaller than final pixel in reconstructed image - loose of resolution
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- Beam fits in probe window - probe window is capable to accommodate for defocused probe
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- Detector cover < 1α - no reconstruction method for such a dataset
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- Detector cover > 6α - usually no scattering beyond 5α
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Always carefully check maximal detector frame rate, needed binning and set dwell time!!
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