In this paper, the hydrodynamic characteristics including the droplet velocity, the droplet diameter, and the droplet movement direction in a 4038 pulsed sieve plate extraction column were measured with a four-sensor optical probe, where water and 40% (Vo/Vo) octanolkerosene were used as the continuous phase and the dispersed phase, respectively. The influence of the pulsation intensity on the droplet characteristics was investigated. Experimental results showed that with the increase of the pulsation intensity, the droplet velocity and the angle between the droplet movement direction and the probe increase, and the droplet diameter decreases. Under the same experimental condition, the velocity of larger droplets is larger than that of smaller droplets. It is demonstrated that the four-sensor optical probe is reliable to the measurement of the dispersed phase hydrodynamic characteristics in liquid-liquid two-phase flow through the analysis and estimation of error caused by the time delay of the probe signal and the direction deviation of the probe. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.