Title (en)

DEVICE FOR MEASURING, BY DIFFRACTION, THE SIZE OF SUBSTANTIALLY SPHERICAL PARTICLES, IN PARTICULAR OPAQUE DROPS

Title (de)

VORRICHTUNG ZUR MESSUNG DURCH BEUGUNG DER GRÖSSE VON IM WESENTLICHEN SPHÄRISCHEN TEILCHEN, INSBESONDERE UNDURCHSICHTIGEN TROPFEN

Title (fr)

DISPOSITIF DE MESURE, PAR DIFFRACTION, DE TAILLES DE PARTICULES SENSIBLEMENT SPHERIQUES, NOTAMMENT DE GOUTTES OPAQUES

Publication

EP 1240496 A1 20020918 (FR)

Application

EP 00985341 A 20001128

Priority

• FR 0003318 W 20001128
• FR 9914992 A 19991129

Abstract (en)

[origin: WO0140766A1] The invention concerns a device for measuring, by diffraction, the size of substantially spherical particles, in particular opaque drops. Said device comprises means (46, 49, 50, 51) for receiving light diffracted by the particles (12) illuminated with a light beam, for separating said diffracted light into concentric annular zones and concentrating the parts of diffracted light, corresponding to said zones, into points (24, 26, 28) different from one another. Levels of luminous intensity are detected corresponding to said points and the size of the particles are determined on the basis of said levels of luminous intensity. The angular pattern of the concentric zones is selected in accordance with a distribution optimising the discrimination between the dimensions of the drops.

IPC 1-7

G01N 15/02

IPC 8 full level

G01B 11/08 (2006.01); G01N 15/02 (2006.01); G01N 15/14 (2006.01)

CPC (source: EP US)

G01N 15/0211 (2013.01 - EP US); G01N 2021/4716 (2013.01 - EP US)

Citation (search report)

See references of WO 0140766A1

Designated contracting state (EPC)

AT BE CH DE GB LI

DOCDB simple family (publication)

WO 0140766 A1 20010607; EP 1240496 A1 20020918; FR 2801671 A1 20010601; FR 2801671 B1 20011221; JP 2003515738 A 20030507; US 6850324 B1 20050201

DOCDB simple family (application)

FR 0003318 W 20001128; EP 00985341 A 20001128; FR 9914992 A 19991129; JP 2001542182 A 20001128; US 14835402 A 20020904