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Analysis of the linear decrease in the reflectivity measured for bubbles growing on a substrate in a liquid for dissolved-gas sensor applications
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DOI：10.1016/j.snb.2018.12.088.png)
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摘要
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As a new sensing mechanism for dissolved-gas sensors, it has been reported that the reflectivity of bubbles growing on porous silicon film in water decreases in a nearly linear manner over time. In order to determine the cause of this peculiar phenomenon, we obtained a continuous stream of projection images of a bubble growing on a transparent glass substrate in different liquids (in this case beer and cola) with a high-speed camera. The time dependences of the bubble volume and the footprint area between the bubble and the substrate were also analyzed. As a result, it was found that the area of the ring-shaped black region in the projection image increases linearly in proportion to time, thereby decreasing the reflectivity linearly. It was also found that when the dissolved gas concentration in the liquid decreased during the growth of the bubble, the area of the ring-shaped black region increased nonlinearly with time rather than linearly.
Keyword:
Sensing principle
Bubble
Projection image
dissolved gas concentration
Reflectivity
Sensing mechanism
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期刊
IF:
7.7
论文数:
3.4W
被引数:
12.6W
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