The synergy of novel MIR‐fibers with FTIR‐spectroscopy opens a new horizon in applications of spectroscopy in 4 − 16 μm range in vivo medical diagnostics. 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: 0.1 − 0.5 dB/m nearby 10μm, and high flexibility: Rbending > 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: cancer detection and glucose content measurements in whole human blood is possible. The new family of evanescent fiber sensors is started for the direct in‐process applications. Fiberoptic Evanescent Wave FTIR Spectroscopy (FEWS) for cancer diagnosis in human organs is exemplified in this paper, and their great potentiality is demonstrated.
The relation between the structure of fibres extruded from mixed silver halides AgBr 1−x Cl x and their IR optical losses and luminescence properties is studied. The recently established ageing effect of the considerable growth of mean grain size of the fibre's polycrystalline structure (typically from 20 to 1000 nm in two years) is correlated with IR and luminescence measurements. IR spectra measured in the interval 3.0-13 µm show growth of the concentrations of molecular impurities. The luminescence measurements are used for the characterization of the fibre's structure ordering. The luminescence decay kinetics is analysed theoretically in terms of the diffusion-controlled recombination of spatially well-correlated Frenkel defects. The considerable difference between the diffusion properties of monocrystals and fibres is established. This is caused by partial disorder (the grain structure effect) of the initially polycrystalline structure arising due to the fibre extrusion.
Different mechanisms of extrinsic losses, including aging, in extruded mixed AgClBr fibers are discussed. Additional losses caused by changes in structure of fiber material have been investigated. INTRODUCTION Mechanisms of optical losses in polycrystaffine fibers are still not clear due to theirs complicated dependence on a lot of various parameters of extrusion process and initial characteristics of crystalline preforms [1-4]. Aging effect is also determined by parameters of "fresh" fibers and by influence of environment conditions and way of fiber use. Our last studies were undertaken for better understanding of correlation between structure and optical losses in polycrystalline fibers extruded from crystals of solid solutions AgCI-AgBr. SPIE VoL 1591 Infrared Fiber Optics /11(1991) / 83 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/25/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
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