Conceptualised, developed and constructed in the context of the CALLOS project, TRIENA is a compact, portable, field-ready analytical instrument, fusing three spectrochemical techniques: Laser-Induced Breakdown Spectroscopy, LED-Induced Fluorescence, and Diffuse Reflectance spectroscopy.

Since October 2023, right with the completion of CALLOS, this innovative analytical instrument has been installed at the conservation labs of the Ephorate of Antiquities of the City of Athens (EACA), and used by conservators in the context of studies related to the preservation of heritage objects, including, among others, stone sculpture, wall paintings, icons and manuscripts. The Photonics for Heritage Science (PhoHS) group collaborates closely with conservation scientists at EACA developing further protocols and methods for analyzing materials and objects. Routine use of TriENA in materials analysis, not only in the EACA labs but also outdoors, at monument sites in the Athens area, is expected to enhance the scientific support for crucial ongoing research and preservation initiatives.

Details concerning the TRIENA concept along with engineering aspects and relevant examples, demonstrating the instrument’s performance, are described in an article recently published in Analytical Chemistry, titled "TriENA: a portable, hybrid multimode spectrometer combining Diffuse Reflectance, LED-Induced Fluorescence, and Laser-Induced Breakdown Spectroscopy for a holistic analysis of materials on monuments and objects of archaeological interest" (https://doi.org/10.1021/acs.analchem.5c05236).