Title:
METHOD AND APPARATUS FOR MEASURING DIAMETER AND DISTRIBUTION OF MICRO BUBBLE AND MICRO LIQUID DROP AND OPTICAL SYSTEM FOR MEASURING DIAMETER AND DISTRIBUTION OF MICRO BUBBLE AND MICRO LIQUID DROP
Document Type and Number:
WIPO Patent Application WO/2001/050111
Kind Code:
A1
Abstract:
A method for measuring the diameter of a micro liquid drop and the spatial distribution of micro liquid drops by measuring the diameter of an unsharp image due to defocusing and the number of interference fringes thereof is applied to measurement of micro bubbles and applicable even if the spatial distribution density of micro liquid drops or micro bubbles is high. A liquid space where a micro bubble (10) is floating is irradiated with a sheet-like parallel laser beam (2), and a defocus image of the micro bubble (10) to which the laser beam is applied is picked up on a defocus plane (8) through an objective lens (6) in a direction at an angle $g(u) with respect to the direction where the laser beam travels. The interference fringes (9) in the defocus image (10') of the micro bubble (10) are counted, and the diameter of the micro bubble (10) is determined according to formula (4).
Inventors:
MAEDA MASANOBU (JP)
KAWAGUCHI TATSUYA (JP)
KAWAGUCHI TATSUYA (JP)
Application Number:
PCT/JP2000/009082
Publication Date:
July 12, 2001
Filing Date:
December 21, 2000
Export Citation:
Assignee:
UNIV KEIO (JP)
MAEDA MASANOBU (JP)
KAWAGUCHI TATSUYA (JP)
MAEDA MASANOBU (JP)
KAWAGUCHI TATSUYA (JP)
International Classes:
G01B11/08; G01N15/02; G01B11/00; G01N15/14; G01P5/18; G01N15/00; (IPC1-7): G01N15/00; G01N15/02
Foreign References:
| JPH05264433A | 1993-10-12 | |||
| JPH0287045A | 1990-03-27 | |||
| JPS6319506A | 1988-01-27 |
Other References:
N. ROTH, K. ANDERS, A. FROHN: "Refractive-index measurements for the correction of particle sizing methods", APPLIED OPTICS, vol. 30, no. 33, 1991, US, pages 4960 - 4965, XP002937348
A.R. GLOVER, S.M. SKIPPON, R.D. BOYLE: "Interferometric laser imaging for droplet sizing: A method for droplet-size measurement in sparse spray systems", APPLIED OPTICS, vol. 34, no. 36, 1995, US, pages 8409 - 8421, XP002937349
GLOVER A. R. ET AL.: "Applied Optics, OSA", vol. 34, 19 November 1227, OPTICAL SOCIETY OF AMERICA, article "Interferometric laser imaging for droplet sizing: a method for droplet-size measurement in sparse spray systems", pages: 8409 - 8421
RAGUCCI RAFFAELE ET AL.: "Drop sizing by laser light scattering exploiting intensity angular oscillation in the Mie regime", PARTICLE AND PARTICLE SYSTEMS CHARACTERIZATION, vol. 7, no. 1-4, 19 June 1207 (1207-06-19), pages 221 - 225
HESSELBACHER K. H. ET AL.: "Experimental investigation of Gaussian beam effects on the accuracy of a droplet sizing method", APPLIED OPTICS USA, vol. 30, no. 33, pages 4930 - 4935
A.R. GLOVER, S.M. SKIPPON, R.D. BOYLE: "Interferometric laser imaging for droplet sizing: A method for droplet-size measurement in sparse spray systems", APPLIED OPTICS, vol. 34, no. 36, 1995, US, pages 8409 - 8421, XP002937349
GLOVER A. R. ET AL.: "Applied Optics, OSA", vol. 34, 19 November 1227, OPTICAL SOCIETY OF AMERICA, article "Interferometric laser imaging for droplet sizing: a method for droplet-size measurement in sparse spray systems", pages: 8409 - 8421
RAGUCCI RAFFAELE ET AL.: "Drop sizing by laser light scattering exploiting intensity angular oscillation in the Mie regime", PARTICLE AND PARTICLE SYSTEMS CHARACTERIZATION, vol. 7, no. 1-4, 19 June 1207 (1207-06-19), pages 221 - 225
HESSELBACHER K. H. ET AL.: "Experimental investigation of Gaussian beam effects on the accuracy of a droplet sizing method", APPLIED OPTICS USA, vol. 30, no. 33, pages 4930 - 4935
Attorney, Agent or Firm:
Nirasawa, Hiroshi (Ueno 3-chome Taito-ku, Tokyo, JP)
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