Observation of High-Frequency Oscillations of Water Vapor Microbubbles Using the HPV-X3

User Benefits

- The HPV-X3 high-speed video camera enables high-speed imaging of up to 20 Mfps. - The camera is capable of capturing high-resolution images of the high-frequency oscillations of microbubbles and the shape changes during their contraction process.

Introduction

In recent years, microbubble technology has been attracting attention, particularly in the medical field. For example, it is hoped that by encapsulating drugs in microscopic bubbles and delivering them to specific cells, the effectiveness of treatment can be improved. One method of generating such bubbles is to focus a laser on gold nanoparticles or FeSi₂ thin films to generate bubbles locally by applying heat. It has been reported that rapid convection on the order of 1 m/s occurs around the water vapor bubbles generated by this method, with one contributing factor being the oscillations of the bubbles. In this paper, a high-speed video camera (HPV-X3) was used to capture the expansion and contraction of water vapor bubbles generated by laser irradiation. The HPV-X3 enables high-speed imaging at up to 20 Mfps. This feature allows for observing not only the oscillations of the water vapor bubbles but also the detailed shape changes during the contraction process.

June 3, 2025 GMT