There are a large number of bubbles in ocean, such as H2S, CH4 and CO2 in hydrothermal and cold springs. Bubbles in
seawater are moving targets with small scale and high transparency, and it is difficult to obtain their clear optical images.
In order to better image tiny bubbles, it is necessary to explore the optical characteristics of bubbles under different angles
of incident light. By building a multi-angle optical characteristic analysis device for underwater bubbles, this paper collects
bubble images at different incident angles, and analyzes the image characteristics of tiny bubbles. The typical bubble
patterns are "hamburger" and "doughnut". In experiment, the bubble groups at different angles were collected and analyzed,
and an orthogonal narrow slice imaging scheme was proposed. The optical slice imaging can obtain clear optical images
of bubbles, which is conducive to quantitative analysis of bubble identification and counting in the later stage.
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