Abstract: The synergy of novel MIR-fibers with Fourier Transform Infrared (FTIR) spectroscopy opens new horizons in applications of spectroscopy in the 4 - 16 $mu@m range for in line control of chemical processes, in vivo medical diagnostics and in situ pollution monitoring. The innovated bare core and core-clad MIR-fibers are produced by hot extrusion method from the crystals of silver halides solid solutions. These non toxic and non hygroscopic fibers are characterized by low optical losses $MIN 0.1 - 0.5 dB/m nearby 10 $mu@m, and high flexibility - R$-bending$/ $GRT 10 - 100 fiber diameters. Some prototypes of accessories for FTIR spectrometers, based on commercially available MIR-fibers for several areas of promising applications are developed. Non-invasive medical diagnostics in vivo including cancer diagnostics are possible. FTS methods with evanescent fiber probes for cancer detection in human organs is exemplified in this paper and their great potential is demonstrated. !8
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