Stratified dispersive model for material characterization using terahertz time-domain spectroscopy

TL;DR

This paper introduces a new THz analysis method that models layered materials locally to accurately determine their properties, useful for industrial quality control of coated paper and car paint layers.

Contribution

It presents a stratified dispersive model for THz spectroscopy that improves material parameter accuracy in realistic environments, advancing industrial applications.

Findings

Accurate material parameters obtained for layered samples.

Effective in humid air conditions.

Applicable to quality control of paper and paint layers.

Abstract

We propose a novel THz material analysis approach which provides highly accurate material parameters and can be used for industrial quality control. The method treats the inspected material within its environment locally as a stratified system and describes the light-matter interaction of each layer in a realistic way. The approach is illustrated in the time-domain and frequency-domain for two potential fields of implementation of THz technology: quality control of (coated) paper sheets and car paint multilayers, both measured in humid air.