Abstract
Abstract A droplet generator was used to calibrate and study some features of the forward-scattering spectrometer probe (FSSP). The generator produces a stable jet of monodisperse droplets with the rate of 50–500 droplets per second and a velocity between 0.4 and 1.3 m s−1. The estimated standard deviation of the diameter of the droplets is not larger than 1%. Because of the low rate of generated droplets, there were no coincidence problems during the measurements, that is, no multiple droplets in the laser beam. The results of FSSP calibration in its operating ranges 0 and 1 are presented in this paper. The experiments revealed minor differences (<15%) to the size calibration given by the manufacturer. A comparison of the measurements with theoretical Mie curves yielded good agreement. Furthermore, the effects of the laser beam inhomogeneity on the droplet sizing were studied. Scanning the droplet jet perpendicular and parallel to the axis of the laser beam of the FSSP showed that underestimates of the d...
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