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Development of MID-IR hyperspectral imaging system based on quantum cascade laser

Reppas Panagiotis

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Summary

Infrared hyper-spectral imaging is a non-contact, non-destructive detection technology that integrates conventional imaging and spectroscopy to get both spatial and spectral information of a target. This technique has in recent times become a powerful tool for scientific and industrial analysis in many different fields. Its applications range from security, through chemistry and biomedical applications. Infrared hyper-spectral images represent observations of a scene at many different wavelengths and most importantly associate each pixel in the image with a full spectral vector or spectral signature. The work presented in this thesis deals with the design and development of a mid-infrared hyper-spectral imaging system based on a quantum cascade laser. The implementation employs a sensitive camera, a coherent light source, a light expander, and software specially designed for the purposes of this system and exploits the full potential of the hardware. A surface’s spectrum can be acquired with the following procedure: the light source illuminates the surface with light beams of different wavelength; thus the sensor acquires optical information captured at different wavelengths at a time. After completing the acquisition process of the spectral cube the spectrum of each pixel can be generated and displayed as a diagram. Each substance absorbs different wavelengths and as a result its absorption diagram can be used in order to identify the substances of which the targeted surface is composed. The features described above make this device suitable for demanding spectral imaging applications, such as microscopic images and non-destructive analysis.

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