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首页> 美国政府科技报告 >A Comparison of Signal-to-Noise Ratios for Single Channel Methods (Sequential and Multiplex) Versus Multichannel Methods in Optical Spectroscopy.
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A Comparison of Signal-to-Noise Ratios for Single Channel Methods (Sequential and Multiplex) Versus Multichannel Methods in Optical Spectroscopy.

机译：光谱学中单通道方法（序列和多路）与多通道方法的信噪比比较。

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摘要

Four major types of spectroscopic systems for quantitative analysis of one or more spectral components are compared, with regard to signal-to-noise ratio for constant analysis time. These four methods are based on sequential-linear scan, sequential-slew scan, multichannel, and multiplex approaches. The multiplex methods can generally be classified into two types, namely Fourier transform spectroscopy and Hadamard transform spectroscopy. It is shown that for the same spectral source, for the same resolving power luminosity product of the optical system, and the same detector, the multichannel approach is the best and the sequential slew scan system is nearly as good for relatively simple spectra in the u.v.-Visible region. Multiplex methods have little to offer in the u.v.-Visible region, where the detector noise limitation seldom applies and where background shot and/or fluctuation noise are dominant but could find considerable use in the u.v.-Visible region for atomic fluorescence or emission spectroscopy especially if the density of spectral lines in the measurement region is not too great and the background intensity is low.

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