| http://www.w3.org/ns/prov#value | - of the sheet-shaped parallel laser beam. [0019] Another method of measuring the diameter, distribution and so forth of micro gas bubbles and micro liquid droplets according to the present invention is a method wherein a sheet-shaped parallel laser beam is applied to a space in which micro gas bubbles or micro liquid droplets are floating, and linear out-of-focus images of micro gas bubbles or mic
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