The Implications of Fluctuation Noise in Multiplex Spectroscopy

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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 SNR sc(ν) is the signal/noise ratio as a function of ν, f(ν) is the spectral density function of the spectrum measured at resolution Δν, a is the noise equivalent power of the detector, b is the relative fluctuation amplitude of fluctuations in the source, sample, or measuring system, T is the total measurement time, and ν1, ν2 the scan limits.

Keywords: Fourier transform spectroscopy, infrared; Signal/noise ratio

Document Type: Short Communication


Affiliations: Block Engineering, Inc., 19 Blackstone Street, Cambridge, Massachusetts 02139

Publication date: March 1, 1976

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