Gorecki, J; Murphy, K N; Markl, D; Burnett, A D; Naftaly, M (2025) Modelling THz TDS Spectra of Powder Compacts for Analysis of Pharmaceutical Oral Solid Dosages. In: 2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 17-22 August 2025, Helsinki, Finland.

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Abstract

THz TDS is a vital tool in many industrial sectors, however commonly analyzed samples are often produced as powders or granular materials; these morphologies have been demonstrated to produce anomalous spectral features which appear at unpredictable locations and can hamper spectral analysis. Here we systematically study the effects of sample morphology on the appearance of anomalous spectral features and present a physical mechanism to describe their behavior. Two part powder compacts of PTFE and Borofloat glass are prepared at a range of microsphere sizes and concentrations for TDS measurement. Further, a computational model utilizing raytracing through heterogeneous material is developed, which is able to accurately predict the anomalous spectral features. By attributing a physical mechanism to this phenomenon, we are able to predict their occurrence, and utilize their presence to deduce
sample morphology.

Item Type:	Conference or Workshop Item (Paper)
Keywords:	terahertz
Subjects:	Optical Radiation and Photonics > Materials and Appearance
Divisions:	Electromagnetic & Electrochemical Technologies
Publisher:	IEEE
Identification number/DOI:	10.1109/IRMMW-THz61557.2025.11320042
Last Modified:	23 Mar 2026 13:48
URI:	https://eprintspublications.npl.co.uk/id/eprint/10341