Design and performance evaluation of a near-infrared Fourier transform spectrometer

Vidi A. Saptari; Kamal Youcef-Toumi

doi:10.1117/12.407643

22 November 2000 Design and performance evaluation of a near-infrared Fourier transform spectrometer

Vidi A. Saptari, Kamal Youcef-Toumi

Proceedings Volume 4163, Optical Techniques and Instrumentation for the Measurement of Blood Composition, Structure, and Dynamics; (2000) https://doi.org/10.1117/12.407643
Event: EOS/SPIE European Biomedical Optics Week, 2000, Amsterdam, Netherlands

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.

Citation Download Citation

Vidi A. Saptari and Kamal Youcef-Toumi "Design and performance evaluation of a near-infrared Fourier transform spectrometer", Proc. SPIE 4163, Optical Techniques and Instrumentation for the Measurement of Blood Composition, Structure, and Dynamics, (22 November 2000); https://doi.org/10.1117/12.407643

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