Abstract
The pulse-laser induced luminescence method (LIL method) developed in our laboratory has proved promissing for instantaneous quantitative measurement of flow velocity distribution. Now luminescent particles with small diameter can be obtained and the LIL method is applicable to gas and liquid flows. However, the CRT images have small line width and intensity distribution because the luminescent images are exposured on the CRT camera through a hole of a rotating disk as a shutter.
In this study, to obtain thin time-lines from the CRT images, image processing methods are investigated. A frame memory is used for recording, and a personal computer, for processing. The meth-ods with Sobel filtering and thinning, and with thresholding and thinning are suitable for the processing.
Using these methods, variations of time-lines in a T branch tube are observed.
