Abstract
Entrainment-mixing processes such as droplet spectrum broadening and its
impact on the onset of precipitation are, among many others, physical
phenomena whose experimental study relies on in-cloud airborne
measurements. For more than 30 yr, droplet sizing has been performed
mostly with the Forward Scattering Spectrometer Probe (FSSP-100). The
probe performance was extensively studied and probabilistic procedures
were developed for characterizing the transfer function of the probe and
correcting instrumental artifacts in the measurement of both the total
droplet concentration and the droplet spectral shape. These procedures
are revised here with a focus on low concentration measurements and the
spectral distortion that may be generated by the real-time pulse
processing, when the actual droplet spectrum is broad. The transfer
matrix method is extended to account for this instrumental artifact.
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