Optical system for measuring diameter, distribution and so forth of micro bubbles and micro liquid drop
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United States of America Patent
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-
Jul 1, 2003
Grant Date -
Oct 31, 2002
app pub date -
Sep 4, 2001
filing date -
Jan 7, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention expands a method of measuring the diameter, spatial distribution and so forth of micro liquid droplets by measuring the diameter of each out-of-focus image obtained by defocusing and the number of interference fringes in the out-of-focus image into a measuring method for micro gas bubbles and allows the method to be applied to a case where the spatial distribution density of micro liquid droplets and micro gas bubbles is high. A sheet-shaped parallel laser beam (2) is applied to a liquid space in which micro gas bubbles (10) are floating, and out-of-focus images of micro gas bubbles (10) irradiated with the laser beam (2) are captured at a defocus plane (8) through an objective lens (6) from a lateral direction which is at an angle .theta. to the direction of travel of the laser beam. The number of interference fringes (9) in an out-of-focus image (10') corresponding to a micro gas bubble (10) is measured, and the diameter of the micro gas bubble (10) is determined according to equation (4).
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