Abstract
We measured water temperature around a self-oscillating water vapor-rich bubble using diffraction phase microscopy equipped with a pulsed laser. The water vapor-rich bubble, which causes a strong water flow around it, was generated by locally heating degassed water through the photothermal conversion properties of an FeSi2 thin film. The generation of the flow is related to the self-oscillation of the bubble at sub-MHz frequencies and the temperature distribution around it. Here, the refractive index of the surrounding water was measured using a pulsed laser with a 3.5-ns pulse duration, which guarantees a time resolution of less than 1/200 of the oscillation cycle of the bubble. The temperature distribution around the bubble was calculated from the measured refractive index.
| Original language | English |
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| Title of host publication | Optical Manipulation and Structured Materials Conference 2025 |
| Editors | Takashige Omatsu, Kishan Dholakia, Sile Nic Chormaic |
| Publisher | SPIE |
| ISBN (Electronic) | 9781510693555 |
| DOIs | |
| State | Published - 2025 |
| Event | Optical Manipulation and Structured Materials Conference 2025 - Yokohama, Japan Duration: Apr 21 2025 → Apr 25 2025 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
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| Volume | 13703 |
| ISSN (Print) | 0277-786X |
| ISSN (Electronic) | 1996-756X |
Conference
| Conference | Optical Manipulation and Structured Materials Conference 2025 |
|---|---|
| Country/Territory | Japan |
| City | Yokohama |
| Period | 04/21/25 → 04/25/25 |
Funding
This study was supported by the JST FOREST Program (Grant No. JPMJFR203N, Japan) and JSPS KAKENHI Grant No. 21H01784. It was also financially supported by a collaborative research project between Kyoto University and Mitsubishi Electric Corporation on Evolutionary Mechanical System Technology.
Keywords
- microbubbles
- microfluidics
- phase imaging
- photothermal
- pulsed laser
- temperature measurement