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15 December 2000 Multichannel MCT/PIR-fiber detectors for fast pyrometry and multispectral sensing
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MCT-detectors are the most sensitive detectors used for spectroscopic applications in the middle infrared (MIR) fingerprint region of spectra (5-15 micrometers ), but their exploitation requires Liquid Nitrogen (LN) cooling in specialized optical dewars and precise optical alignment systems. Polycrystalline Infrared (PIR) fibers from solid solutions of AgCl/AgBr are transparent in the spectral range of 4-18 micrometers and have been coupled with pigtailed MCT detectors. The combination of such more advanced MCT detectors with PIR-fibers' flexibility enables remote spectroscopy of chemical reaction processes in situ or biomedical diagnostics in vivo at distances up to 20 meters from Fourier Transform Infrared (FTIR), Tunable Diode Laser (TDL) or optical filter spectrometers. The main advantage of these multichannel MCT/PIR detectors for spectroscopy and multispectral sensing is that there is no need for costly and bulky optics and time consuming alignment procedures of the MCT detector and the dewar in relation to the IR sources used. In this study, PIR-fiber pigtailed 2 and 4 channel MCT-detectors are described for different spectroscopic applications where the fibers are assembled in a bundle for remote spectroscopy and for multispectral analysis of specific targets and characteristic wavelengths.
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Vjacheslav G. Artioushenko, Natalia I. Afanasyeva, and Reinhard F. Bruch "Multichannel MCT/PIR-fiber detectors for fast pyrometry and multispectral sensing", Proc. SPIE 4130, Infrared Technology and Applications XXVI, (15 December 2000);

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