IRIS-II, a portable MultiSpectral Imaging instrument, enables the compositional and structural study of multi-layered Cultural Heritage surfaces. It is fully portable enabling thus the examination of objects in situ (museums, conservation laboratories, archaeological areas etc.). This imaging system, provides detailed information related to the physical and chemical properties of materials, based on reflection and fluorescence spectroscopy.

The main elements of the multi-spectral imaging system include a camera, an imaging monochromator equipped with a filter wheel of 28 band-pass filters, the objective lens, electronics and a computer that controls all the components. The camera used on the system is a monochrome digital CMOS camera. The spatial resolution is 5MPixels, while the dynamic range applied is 8 bit. This sensor is sensitive from 350 nm up to 1200 nm. 

The whole system is designed to be portable and can be carried in a small case. 

Finally, custom-made software, entirely developed in LabView is employed. This software enables the control of the system and the data acquisition. Additional processing software for images normalization, calibration and analysis is also developed and used.