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Turbulence noise in dual-wavelength long-path laser absorption spectrometers is analyzed with the aid of weak turbulence theory, and results are compared with experimental CO(2) laser beam transmission data. Spectrometers with finite-sized transmitter and receiver apertures are considered, where noise reduction is sought simultaneously through aperture(More)
An experimental investigation has been carried out on turbulence-induced noise in a long-path laser absorption spectrometer which measures sequentially the atmospheric transmission at two preselected wavelengths over the same path. A simple analysis shows that performance degradation due to scintillation can be significantly reduced by exploiting the(More)
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