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In 2001, an ultra-high-speed video camera of 1,000,000 frames per second was developed in Hydraulics Laboratory of Kinki University. The image sensor of the camera was the ISIS-V2, the In-situ Storage Image Sensor-Version 2. The camera has been applied to visualization of high-speed phenomena in various fields of science and engineering. We observed entrapment phenomena of bubbles resulting from thermal spraying of metals. Thermal spraying is used to improve solid surfaces by spraying melted metal or ceramic particles to the surfaces. One of the problems relating to the thermal spraying is entrapment of air bubbles under the metal or ceramic layers covering the solid surfaces. The bubbles decrease bonding strength of the layers made by the thermal spraying. The entrapment processes were successfully visualized by application of the ultra-high-speed video camera.
Nao Ootsuka,Takeharu Goji Etoh,Kohsei Takehara,Sachio Oki,Yasuhide Takano,Yuya Hatsuki, andSigurdur T. Thoroddsen
"Air-bubble entrapment due to a drop", Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); https://doi.org/10.1117/12.566172
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Nao Ootsuka, Takeharu Goji Etoh, Kohsei Takehara, Sachio Oki, Yasuhide Takano, Yuya Hatsuki, Sigurdur T. Thoroddsen, "Air-bubble entrapment due to a drop," Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); https://doi.org/10.1117/12.566172