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Small bubbles (< ~100 µm) in water are perfect spheres to which the Mie theory applies. This has been used to determine the sizes of such bubbles by measuring the intensity of light scattered at an angle. Hansen (1985) reports that by measuring power of light scattered by a bubble in an angular range of 79° to 81° the diameter of an air bubble in water can be determined to within 3% for bubbles smaller than ~80 µm. Holt and Crum (1990) used essentially the same technique to examine oscillations of an air bubble excited by an acoustic wave.
The size of a bubble that is much larger than the wavelength of light, for example, on the order of 1000 µm (1 mm), can be determined by measuring the attenuation of light by the bubble (for example, Asaki and Marston 1995). This attenuation is proportional to the geometric cross section of the bubble.
| CITATION: Jonasz M. 2006. Sizing of air bubbles by light scattering (www.tpdsci.com/Tpc/SzBblSca.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 17-Apr-2006 Modified: 07-Jul-2006 Peer-reviewed: PENDING |
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