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DIFFRACTION MONPIORING OF RAYLEIGH MODE DROPLET FORMATION

IP.com Disclosure Number: IPCOM000022790D
Original Publication Date: 1976-Feb-29
Included in the Prior Art Database: 2004-Mar-26
Document File: 2 page(s) / 262K

Publishing Venue

Xerox Disclosure Journal

Abstract

A light diffraction technique is set forth for monitoring the behavior of small liquid jets operating in the Rayleigh mode, Measurement and on-line control of jet parameters is thereby enabled. A beam of light from laser 9 is directed through an array of particles 6 produced by Rayleigh mode jets creating a dif- fraction pattern dependent upon the vertical periodicity (up and down in the drawing) of the particle array. The dot separation in the Y direction of the diffraction pattern is inversely proportional to the vertical periodicity and con- centric bright and dark rings in the diffraction pattern are inversely related in size to the diameter of the droplets.

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XEROX DISCLOSURE JOURNAL

DIFFRACTION MONPIORING OF Proposed Classification
RAYLEIGH MODE DROPLET U.S. Cl. 356/138
FORMATION mt. Cl, GOib 11/26

D.R, Ims
A,P, Neukermans

A light diffraction technique is set forth for monitoring
the behavior of small liquid jets operating in the Rayleigh
mode, Measurement and on-line control of jet parameters is
thereby enabled.

A beam of light from laser 9 is directed through an array of
particles 6 produced by Rayleigh mode jets creating a dif-
fraction pattern dependent upon the vertical periodicity (up
and down in the drawing) of the particle array. The dot
separation in the Y direction of the diffraction pattern is
inversely proportional to the vertical periodicity and con-
centric bright and dark rings in the diffraction pattern are
inversely related in size to the diameter of the droplets.

The diffraction pattern can be optionally viewed and
measured at this point and computations made for vertical
drop separation and velocity. Visibly, more intense and

numerous concentric rings indicate a smaller particle size
distribution. The vertical drop separation, S, is equal to

~ld/~x where ~l is the laser radiation wavelength, Ax is the
distance between horizontal bands in the diffraction pattern
and d is the distance between screen and particle array.
Velocity, Vj, is equal to sf where f is the acoustic driving

frequency of the transducer used as a driving force to
create Rayleigh mode spraying, The particle radius, a, is
equal to 7.016 divided by p/d w...