Frequency domain NIR measurements with optical fibers: Limits and perspectives

Year: 1997

Authors: Salimbeni R., Marconi G., Pini R., Vannini M.

Autors Affiliation: Institute of Quantum Electronics, IEQ, CNR, Via Panciatichi 56/30, I-50127 Florence, Italy

Abstract: NIR spectroscopy and imaging are having an increasing interest as not invasive diagnostics, for the evolution experienced in the last years by both instrumentation technology and interpretation models. In the frequency domain, the informative content of the diffusive photons waves is primarily limited by the approximation of the reconstruction algorithm, according to the measurement precision of the whole diagnostic apparatus. In this work, the influence of optical fiber delivery and collection systems has been studied, to determine signal amplitudes and phase errors, according to refractive effects at the coupling areas, and to propagation effects as intermodal dispersion induced by bending and other mechanical instabilities of the fibers.

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KeyWords: Algorithms; Approximation theory; Frequency domain analysis; Image reconstruction; Infrared spectroscopy; Medical imaging; Noninvasive medical procedures; Refractive index, Optical fiber dispersion, Optical fibers
DOI: 10.1117/12.280303