Patent · US Expired

Optical system for measuring diameter, distribution and so forth of micro bubbles and micro liquid drop

US6587208B2 · kind B2 · utility

6Cited by
2References
16Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 4, 2001
Grant dateJul 1, 2003
Priority date
Expiry dateDec 8, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01N2015/1493
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

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 &thgr; 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).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.