Modulated Fourier Transform Raman fiber-optic spectroscopy

Details Modulated Fourier Transform Raman fiber-optic spectroscopy Modulated Fourier Transform Raman fiber-optic spectroscopy

1999-05-21

2000-05-09

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356345, G01B 902

Patent

active

060611340

ABSTRACT:
A modification to a commercial Fourier Transform (FT) Raman spectrometer is presented for the elimination of thermal backgrounds in the FT Raman spectra. The modification involves the use of a mechanical optical chopper to modulate the continuous wave laser, remote collection of the signal via fiber optics, and connection of a dual-phase digital-signal-processor (DSP) lock-in amplifier between the detector and the spectrometer's collection electronics to demodulate and filter the optical signals. The resulting Modulated Fourier Transform Raman Fiber-Optic Spectrometer is capable of completely eliminating thermal backgrounds at temperatures exceeding 300.degree. C.

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patent: 5786893 (1998-07-01), Fink et al.
patent: 5870188 (1999-02-01), Ozaki et al.

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