Towards Reflectivity profile inversion through Artificial Neural
Networks
- URL: http://arxiv.org/abs/2010.07634v3
- Date: Sun, 24 Jan 2021 10:00:18 GMT
- Title: Towards Reflectivity profile inversion through Artificial Neural
Networks
- Authors: Juan Manuel Carmona-Loaiza and Zamaan Raza
- Abstract summary: The goal of Specular Neutron and X-ray Reflectometry is to infer materials Scattering Length Density profiles from experimental reflectivity curves.
This paper focuses on investigating an original approach to the ill-posed non-invertible problem which involves the use of Artificial Neural Networks.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The goal of Specular Neutron and X-ray Reflectometry is to infer materials
Scattering Length Density (SLD) profiles from experimental reflectivity curves.
This paper focuses on investigating an original approach to the ill-posed
non-invertible problem which involves the use of Artificial Neural Networks
(ANN). In particular, the numerical experiments described here deal with large
data sets of simulated reflectivity curves and SLD profiles, and aim to assess
the applicability of Data Science and Machine Learning technology to the
analysis of data generated at neutron scattering large scale facilities. It is
demonstrated that, under certain circumstances, properly trained Deep Neural
Networks are capable of correctly recovering plausible SLD profiles when
presented with never-seen-before simulated reflectivity curves. When the
necessary conditions are met, a proper implementation of the described approach
would offer two main advantages over traditional fitting methods when dealing
with real experiments, namely, 1. sample physical models are described under a
new paradigm: detailed layer-by-layer descriptions (SLDs, thicknesses,
roughnesses) are replaced by parameter free curves $\rho(z)$, allowing a-priori
assumptions to be fed in terms of the sample family to which a given sample
belongs (e.g. "thin film", "lamellar structure", etc.) 2. the time-to-solution
is shrunk by orders of magnitude, enabling faster batch analyses for large
datasets.
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