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Hadamard Transform Raman Spectroscopy in the Near-Infrared A Suggestion

Volume 41, Number 4 (June 1987) Page 708-709

Waters, D.N.

There has been much interest in the possibility of securing, for Raman spectroscopy, the multiplex advantage that characterizes Fourier transform infrared spectroscopy. An essential prerequisite before any multiplex advantage can be realized is that the Rayleigh line, and stray light at the excitation wavelength, be effectively removed before the Raman light enters the multiplexing device. Even if this is done, Raman observations in the visible region are not likely to gain from the use of a multiplex method, because the signal-related shot noise usually exceeds the detector noise and is the dominant source of noise in the recorded spectrum. An important case, however, where the use of a multiplex method is expected to yield a significant signal-to-noise (S/N) advantage is that of Raman spectra excited and observed in the near-infrared (NIR) spectral region, provided (as before) the Rayleigh line is effectively removed prior to multiplexing.