Here at INO-CNR of Firenze it has been realized a THz holographic imaging system to get real-time coherent images of dynamic scenes.
The system makes use of a QCL and a microbolometric sensor to obtain phase and amplitude images of THz irradiated targets, both in transmission and in reflection.
Coherent imaging at these wavelengths usually requires long acquisition and processing time which prevents real-time monitoring of moving targets.
The significant reduction of environmental vibration sensitivity and the larger field of view offered by THz radiation employment in holographic imaging, conversely, allow to obtain coherent images of real world dynamic scenes, in real-time, increasing significantly the potential of imaging at these wavelengths.
The employment of THz radiation has a great appeal in various application. The capability of photons at these frequencies to be transmitted through opaque materials in the visible range (tissues, paper, plastics, …) has, indeed, clear potential, for example, in the field of non-destructive testing. The strong absorbance of THz radiation in water, moreover, is well suited for its employment in the biomedical field, as for cancerous tissues investigation.
The possibility to record real-time dynamic scenes may represent an important boost for the use of imaging in this spectral range in various applicative areas, for example, in industrial quality control, in cultural heritage analysis and in histological investigation of biological samples.

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