The signal/noise ratio of a scanning spectrometer in the spectral region where shot noise is not limiting (sub-stantially the λ ≥ 1 μ region of the infrared spectrum) can be expressed as [Equation 1] where <i>SNR</i><sub>sc</sub>(ν) is the signal/noise ratio as a function of ν, <i>f</i>(ν) is the spectral density function of the spectrum measured at resolution Δν, <i>a</i> is the noise equivalent power of the detector, <i>b</i> is the relative fluctuation amplitude of fluctuations in the source, sample, or measuring system, <i>T</i> is the total measurement time, and ν<sub>1</sub>, ν<sub>2</sub> the scan limits.

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