Abstract
The purpose of the present study is to enhance measurement accuracy of a Single-Tip Optical fiber Probe (S-TOP) in droplet measurement. The S-TOP only with a wedge-shaped tip enables simultaneous measurement of the diameters, velocities and number density of bubbles/droplets. To accurately measure randomly-sprayed droplets, a determination of a touched position by the S-TOP on the droplet surface is essential. In this study, we focused on a characteristic peak (a post-signal) contained in an output signal of the S-TOP. First, We computationally clarified the post-signal characteristics; why and how the peak appears. Basically, the post-signal intensively appears when the S-TOP penetrates a droplet at its pole. Second, we experimentally quantified the relationship between the intensity of the post-signal and the touched position. Then, we established new detection method by using of the post-signal. Consequently, this new detection technique successfully improved the accuracy of the S-TOP droplet measurement.
