documentation:adaptive_layer_segmentation

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documentation:adaptive_layer_segmentation [2013/04/03 22:21] 127.0.0.1 external edit |
documentation:adaptive_layer_segmentation [2013/06/20 02:31] (current) macke |
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- | == Adaptive Layer Segmentation Model == | + | == Roughness Models == |

- | The model differs between two methods to calculate the transition of the index of refraction between two layers. | + | The roughness model assumes a continuous transition (error function) of the optical constants between two layers and can be altered by the roughness parameter σ. |

- | The default is Parratt which means the method used in the Parratt32 software from the HMI. | + | |

+ | Two modes implemented to calculate the spectra. | ||

+ | | ||

+ | * Nevot&Croce | ||

+ | * Adaptive Layer segmentation (slicing) | ||

+ | | ||

+ | == Adaptive Layer Segmentation Model == | ||

+ | | ||

+ | The slicing parameters can be changed in the "Adaptive Layer Segmentation" sheet. | ||

+ | |||

+ | The default model is "local" which means the method used in the Parratt32 software from the HMI. | ||

The global model is described in the diploma thesis of M. Harlander. | The global model is described in the diploma thesis of M. Harlander. | ||

If the thickness is smaller than σ both models describe the interface almost like the roughness approximation by Nevot&Croce. | If the thickness is smaller than σ both models describe the interface almost like the roughness approximation by Nevot&Croce. | ||

However there are differences for the case σ>thickness. The local model describes the σ>thickness case like the Nevot&Croce approximation. | However there are differences for the case σ>thickness. The local model describes the σ>thickness case like the Nevot&Croce approximation. | ||

- | The global models should give you physical more feasible results which cannot be modelled by the analytical approximation. | + | The global models should give you physical more feasible results which cannot be modelled by the analytical approximation. |

documentation/adaptive_layer_segmentation.txt · Last modified: 2013/06/20 02:31 by macke