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Proceedings Paper

Design and performance evaluation of a near-infrared Fourier transform spectrometer
Author(s): Vidi A. Saptari; Kamal Youcef-Toumi
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Paper Abstract

A modular Fourier transform spectrometer for the near infrared (NIR) wavelength region was designed and built. The work was motivated by the need for a versatile, economical and a dedicated instrument for research in the area of noninvasive diagnostics. The spectrometer uses a thermo- electrically cooled InGaAs detector for maximum sensitivity and CaF2 lenses for maximum transmission in the NIR region. Great attention was put to ensure that each element was designed and/or chosen to provide maximum sensitivity in the NIR region. The first part of the paper discusses the spectrometer design procedures, which include the design of detector optics, collimating optics, interferometer optics as well as the signal processing electronics and motion control. The second part focuses on performance evaluation and quantification of errors including detector noise, digitization noise and sampling errors. For measurements of water absorption, spectral signal-to-noise ration of ~ 50000 was demonstrated over 150cm-1 wavenumber range. Instrumentation sensitivity was found to be limited by interferogram data sampling noise.

Paper Details

Date Published: 22 November 2000
PDF: 12 pages
Proc. SPIE 4163, Optical Techniques and Instrumentation for the Measurement of Blood Composition, Structure, and Dynamics, (22 November 2000); doi: 10.1117/12.407643
Show Author Affiliations
Vidi A. Saptari, Massachusetts Institute of Technology (United States)
Kamal Youcef-Toumi, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4163:
Optical Techniques and Instrumentation for the Measurement of Blood Composition, Structure, and Dynamics
Alexander V. Priezzhev; P. Ake Oberg, Editor(s)

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