Chopard, Adrien, J. Bou Sleiman, Q. Cassar, P. Fauché, J. P. Guillet, P. Mounaix, M. Pan, J. B. Perraud, and A. Susset. "Contactless Terahertz Paint Thickness Measurements: specificity of aeronautics industry." (2019).
Abstract
We report on numerical developments for the analysis of
multilayered structures and the extraction of individual layer
properties obtained by terahertz time domain measurements.
An iterative algorithm implements a connected propagation
tree which denotes the occurrence of the incident pulse
division for each reflection / transmission appearance at each
interface encountered during the propagation. Each sub pulse
is individually monitored and its carried proportion of the
incident power is extracted. Such a process allows to obtain
the specific dielectric properties of each layer but additionally
permits to derive a parametric transfer function describing the
whole interaction with an incident beam. Procedure results
performed on aeronautics multilayered painting samples are
reported.
for full paper see https://www.ndt.net/article/aero2019/papers/fp_we1a5_a_chopard.pdf
"The first step to achieve the simulations and the
characterization, was to carefully extract the dielectric
properties of each individual painting material (Tab. 1) via a
basic inverse problem method thanks to measurements
performed on a Teraview TPS 4000 system. Both the real and
the imaginary part of the dielectric function are fitted with a
first order Debye relaxation model. "
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