“…For example, in Meshesha DT, et al [13] DSD for each rain was determined by the exposure of about 370 sheets of filter paper treated with a small amount of powdered dye. Automatic measurement of DSD is possible with the use of devices such as disdrometers, which record the spectra of rain drop sizes and falling velocities [3,5,11,15,17,[26][27][28][29][30][31][32]. There are a number of disdrometers based on different physical principles.…”