Identify Binder (AI)
The separation between solid and pores of a structure, can usually be done using image processing methods during the import of the scanned data sets (see the ImportGeo-Vol user guide for more details). However, the separation of binder from fibers is often not possible, since they have the same gray values in the scan.
With GeoDict's Identify Binder (AI) functionality the binder can be identified and seperated from fibers automatically prior to the identification of separate fibers.
Please refer to the AI approach to identify binder and fibers for more details on the theory.
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Important! Since FiberFind ships with a limited number of neural networks for fiber and binder identification, currently some constraints on the input data exist:
- Fiber diameters should be 4 to 10 voxels for binder identification and 8 to 40 voxels for fiber identification.
If fiber diameters differ from this value, ImportGeo-Vol can be used to resample the voxel length. During the import of an image, the 3D Image Processing functionality Image Size→Scale can be used for scaling the 3D image with a different voxel length. Details can be found in the ImportGeo-Vol user guide.
- If fiber diameters in the structure are very different, and therefore, after resampling, not all diameters lie in the range listed above, we suggest separating the fibers and applying FiberFind - Identify Fibers (AI) for each kind of fiber.
To separate the fibers, Estimate Fiber Diameters in FiberFind can be used. Run the fiber diameter estimation and choose the number of fiber types in the Result Plots to fit to your structure. On the tab Result Visualization, you can then load a .gdt file with the fibers separated according to different fiber types. See Estimate fiber diameters for detailed instructions and an example.
- Some networks require fibers to be oriented mainly in the x-y plane. Please see the individual network description in the dialog. If necessary, the structure can be rotated to fulfill this condition.
Changing the coordinate axis is done easily through ProcessGeo → Permute functionality. Details can be found in the ProcessGeo user guide.
Changing the coordinate axis or applying complex rotations to the structure by defining Euler angles is also possible through ImportGeo-Vol. Details are explained in the ImportGeo-Vol user guide.
- Fiber identification works for circular and elliptical fibers right now, not for other cross sections such as hollow or trilobal fibers.
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Note! Besides this user guide, several tutorials showing the possibilities of the AI based FiberFind approach for different application cases are available on the GeoDict Learning Center.
One tutorial is dealing with the analysis of four samples of different carbon paper gas diffusion layers used for a proton-exchange membrane in a fuel cell (Digital analysis of fibers and binder content of a carbon paper GDL). Synchrotron scan data for the sample is provided with the tutorial. The tutorial contains a detailed description of the import and preprocessing of the data, the binder and fiber identification using the AI approach, and postprocessing options for the results.
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