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User libraries is a sub-package where useful Python modules contributed by users are stored.
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Landmines
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Information
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===========
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**Author/Contact**: Iraklis Giannakis (I.Giannakis@ed.ac.uk), University of Edinburgh
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**License**: Creative Commons Attribution-ShareAlike 4.0 International License (http://creativecommons.org/licenses/by-sa/4.0/)
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**Attribution/cite**: Giannakis, I., Giannopoulos, A., Warren, C. (2016). A Realistic FDTD Numerical Modeling Framework of Ground Penetrating Radar for Landmine Detection. *IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing*, 9(1), 37-51. (http://dx.doi.org/10.1109/JSTARS.2015.2468597)
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The module currently features models of different anti-personnel (AP) landmines and a metal can which can be used as a false target. They are:
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* **PMA-1**: a blast AP landmine with minimum metal content, manufactured in the former Yugoslavia. It is possible to detect the PMA-1 with a metal detector because it contains a metal fuse, but there are reports of types of PMA-1 with plastic fuses. The PMA-1 contains 200g of high explosive (TNT). The dimensions of the PMA-1 model are: 140x64x34mm.
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* **PMN**: one of the oldest and most widely used landmines, it is a palm shaped cylindrical blast AP landmine, manufactured in Russia. Similar to PMA-1, the PMN contains a large amount, 240g, of high explosive (TNT). It has a minimum metal content which can make it detectable with a metal detector. The dimensions of the PMN model are: 116x156x50mm.
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* **TS-50**: a blast AP landmine with minimum metal content, manufactured in Italy. The dimensions of the TS-50 model are: 90x90x44mm.
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* **Metal can**: a cylindrical metal can which is can be useful as a false target. The dimensions of the metal can model are: 76x76x108mm.
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The landmine models and the metal can be used with a cubic spatial resolution of either 1mm or 2mm.
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The dielectric properties of the landmines were obtained through an iterative process of matching numerical and laboratory measurements of scattered electromagnetic fields in free space. A full description of how the models were created can be found at http://dx.doi.org/10.1109/JSTARS.2015.2468597.
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Package overview
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================
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.. code-block:: none
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can_1x1x1.h5
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can_materials.txt
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PMA_1x1x1.h5
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PMA_materials.txt
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PMN_1x1x1.h5
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PMN_materials.txt
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TS50_1x1x1.h5
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TS50_materials.txt
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* ``can_1x1x1.h5`` is a HDF5 file containing a description of the geometry of the metal can (false target) with a cubic spatial resolution of 1mm
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* ``can_materials.txt`` is a text file containing material properties associated with the metal can
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* ``PMA_1x1x1.h5`` is a HDF5 file containing a description of the geometry of the PMA landmine with a cubic spatial resolution of 1mm
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* ``PMA_materials.txt`` is a text file containing material properties associated with the PMA landmine
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* ``PMN_1x1x1.h5`` is a HDF5 file containing a description of the geometry of the PMN landmine with a cubic spatial resolution of 1mm
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* ``PMN_materials.txt`` is a text file containing material properties associated with the PMN landmine
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* ``TS50_1x1x1.h5`` is a HDF5 file containing a description of the geometry of the TS-50 landmine with a cubic spatial resolution of 1mm
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* ``TS50_materials.txt`` is a text file containing material properties associated with the TS-50 landmine
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How to use the models
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=====================
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To insert any of the landmine models or metal can into a simulation use the ``#geometry_objects_file`` command.
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Example
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-------
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The input file for inserting the PMN landmine, with the lower left corner 10mm from the origin of the domain, into an empty domain (free-space) would be:
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.. code-block:: none
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#title: PMN landmine (116x156x50mm) in free space
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#domain: 0.136 0.176 0.070
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#dx_dy_dz: 0.001 0.001 0.001
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#time_window: 5e-9
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#geometry_objects_file: 0.010 0.010 0.010 ../user_libs/landmines/PMN_1x1x1.h5 ../user_libs/landmines/PMN_materials.txt
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#geometry_view: 0 0 0 0.136 0.176 0.070 0.001 0.001 0.001 landmine_PMN_fs n
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For further information on the ``#geometry_objects_file`` see the section on object contruction commands in the :ref:`Input commands section <commands>`.
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.. figure:: images/user_libs/PMA.png
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:width: 600 px
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FDTD geometry mesh showing the PMA-1 landmine model.
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.. figure:: images/user_libs/PMN.png
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:width: 600 px
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FDTD geometry mesh showing the PMN landmine model.
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