Terahertz Identification of Materials by Multispectral

Published : 26 November 2021

Master internship – 2021-2022
TITLE: Terahertz Identification of Materials by Multispectral  Imaging


Laboratory: IMEP-LaHC (UMR 5130)
Supervisors: Emilie Hérault/Maxime Bernier
E-mail: emilie.herault@univ-smb. fr / maxime.bernier@univ-smb.fr

Context and objectives:
The field of terahertz waves (THz = 1000 GHz) is very promising for the detection of substances[1] and materials, for security purposes [2], or more generally for non-destructive testing in variousindustrial fields [3]. In the present project, the identification of substances is generally achievedthrough the presence of absorption lines in the THz spectrum, which is sensitive to the bending modes of the constituting molecules. The measurement of the spectral signature and/or the acquisition of a THz image of the sample to be identified over a large bandwidth (point-to-point multispectral imaging) is however often slow, preventing the dynamic study of materials evolving on time scales less than few minutes. TIMMING project aims at developing and studying the performances of innovating techniques and equipment for fast imaging of miscellaneous samples and the study of their sub-second dynamics.

Description of the Research Lab Work:
In this project, we aim at developing an efficient and rapid (real-time) characterization technique, applicable for example to the two application fields mentioned above (security and non-destructive testing). We plan to jointly use the possible specific and discriminating spectral signature of the material tested and a multispectral imaging technique for example to analyze the distribution of the components of a sample, to verify its non-alteration, its belonging to a batch, to identify its provenance and so on. The other idea, which will be prospected during the internship, is based on the use of innovating THz camera associated to THz CW source to perform THz videos.
In addition to the bibliographic work, the student who will be involved in the development of the imaging setup and of a signal processing algorithm based on an innovative theoretical classification/identification tools. He will also use the THz equipments already availlable in the PLATERA characterization platform [4]. In PLATERA, the student will have at his disposal a unique set of measuring equipment and scientific support by teachers-researchers specialized in the THz field.

[1] R. Miles, X.-C. Zhang, H. Eisele, A. Krotkus, « Terahertz Frequency Detection and Identification of Materials end
Objects », NATO Science for Peace and Security Series B: Physics and Biophysics, Springer Nature (2021).
[2] A.U. Sokolnikov, « THz Identification for Defense and Security Purposes », World Scientific (2013).
[3] D. Nüßler, J. Jonuscheit, « Terahertz based non-destructive testing (NDT) – Making the invisible visible »,
Oldenbourg Wissenschaftsverlag April 7 (2020) – DOI 10.1515/teme-2019-0100.
[4] https://www.platera.tech/

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