Introduction
TerahertzTerahertz radiation is electromagnetic energy commonly associated with frequencies around 0.1 to 10 THz, between microwaves and infrared, where many materials reveal distinctive propagation, absorption, and imaging behavior. More time domain imaging, FMCW and spectroscopy are useful tools for artTerahertz technology offers a powerful, non-invasive way to explore and preserve works of art and cultural heritage objects. Positioned between infrared and microwaves, terahertz waves can penetrate many non-metallic and... More restorer to inspect paintings and other cultural. Thanks to the different terahertzTerahertz radiation is electromagnetic energy commonly associated with frequencies around 0.1 to 10 THz, between microwaves and infrared, where many materials reveal distinctive propagation, absorption, and imaging behavior. More equipments present on the terahertz platform in Bordeaux, we have set up collaborations with artTerahertz technology offers a powerful, non-invasive way to explore and preserve works of art and cultural heritage objects. Positioned between infrared and microwaves, terahertz waves can penetrate many non-metallic and... More restorers and researchers working on the analysis of works of artTerahertz technology offers a powerful, non-invasive way to explore and preserve works of art and cultural heritage objects. Positioned between infrared and microwaves, terahertz waves can penetrate many non-metallic and... More with terahertzTerahertz radiation is electromagnetic energy commonly associated with frequencies around 0.1 to 10 THz, between microwaves and infrared, where many materials reveal distinctive propagation, absorption, and imaging behavior. More. This article presents different results obtained with our systems.
Pulse time domain imaging
Time domain imaging is used for artTerahertz technology offers a powerful, non-invasive way to explore and preserve works of art and cultural heritage objects. Positioned between infrared and microwaves, terahertz waves can penetrate many non-metallic and... More painting analysis since several years. This is the reference system which give the best resolution, allow to see multilayers and to give spectral information.
FMCW fast imaging
In this work, we present how FMCW can be used for painting analysis. You can see on this video the image at 300 GHz:
Several image were also made at 100 GHz and 300 GHz, in reflexion and transmission modes.
Flowchart and different approaches
The different terahertzTerahertz radiation is electromagnetic energy commonly associated with frequencies around 0.1 to 10 THz, between microwaves and infrared, where many materials reveal distinctive propagation, absorption, and imaging behavior. More approaches presented here offer different analysis capabilities and results. In addition, the acquisition time varies according to the systems. Consequently, we must choose different analysis surfaces according to the systems used. We can therefore choose an approach consisting in first doing an analysis of the whole painting with the FMCW system, then an image with the TDS system on a small area. Finally, we can focus on a few points to make a spectroscopy analysis.
Read this paper
Guillet, J. P., Roux, M., Wang, K., Ma, X., Fauquet, F., Balacey, H. & Mounaix, P. (2017). ArtTerahertz technology offers a powerful, non-invasive way to explore and preserve works of art and cultural heritage objects. Positioned between infrared and microwaves, terahertz waves can penetrate many non-metallic and... More Painting Diagnostic Before Restoration with TerahertzTerahertz radiation is electromagnetic energy commonly associated with frequencies around 0.1 to 10 THz, between microwaves and infrared, where many materials reveal distinctive propagation, absorption, and imaging behavior. More and Millimeter Waves. Journal of Infrared, Millimeter, and TerahertzTerahertz radiation is electromagnetic energy commonly associated with frequencies around 0.1 to 10 THz, between microwaves and infrared, where many materials reveal distinctive propagation, absorption, and imaging behavior. More Waves, 38(4), 369-379.