Abstract
Fine particle size measurement technique with laser interference fringes is proposed as one of the in-line measurement techniques to the diameter of several hundred nano meter particles. The objective of this study is to examine the principle of this measurement technique with laser interference fringes. First, we visualize the laser interference fringes images with a high-speed video camera. And we identify the fringes images moving through the test cell. Finally, we measure the time variation of the intensity of the laser interference fringes by using photodiodes. It is confirmed that the voltage signal depends on fine particle size. Also, correlation between the time and the voltage signal scattered with the focused laser beam is different from that of with the parallel laser beam.
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