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Imaging Techniques for Flow and Motion Measurement
Lecture 3
Lichuan Gui
University of Mississippi
!11
"article Image #elocimetry $"I#%"article Image #elocimetry $"I#%
IntroductionIntroduction
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&tro'oscopic illumination techniques
Flow visuali(ation with small particlesFlow visuali(ation with small particles
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Oil drop in laminar pipe flow (*ir) +olid particles in water flow
Multiple e*posed particle images
Flow visuali(ation with small particlesFlow visuali(ation with small particles
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, - .component "I# &ystems, - .component "I# &ystems
/0 laser with high.speed photo or video camera
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%luorescent particles in a microdevice
.//0 mm2, fps
+mo1e flow in air
.. mm2, . fps
/onsecutive singly e*posed "I# recordings
, - .component "I# &ystems, - .component "I# &ystems
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easurement
volume3aser
3enst4t
3iht
sheet
3ens system
5 6amera
%luid flow seeded with
small tracer particles
Dou'le e7posed recordin
87posure
90
t4t
Imae 90
+inle e7posed recordin
&tandard , "I#
, - .component "I# &ystems, - .component "I# &ystems
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easurement
volume
3ens
t4t
t4t:t
3ens system
5 6amera
3iht
sheet
+inle e7posed recordin Dou'le e7posed recordin
%luid flow seeded with
small tracer particles
Imae 90
t4t:t
Imae 92
87posure
9087posure
92
3aser
&tandard , "I#
, - .component "I# &ystems, - .component "I# &ystems
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Imae plane
O'ective
3ens
3aser liht sheet
3aser liht sheet
Imae plane
O'ective 3ens
S
S
L
L
Scale factor: M=L/L
Time interval: t
Velocity: #=&/t=M&56 t
#elocity determination with standard , "I#
, - .component "I# &ystems, - .component "I# &ystems
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%lood Illumination
4.2 nm
4
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$ +tereo "I# velocity components in a plane
@wo cameras
$ Aoloraphic "I# velocity components in a dimensional volume
6omple7 and precise illumination
$ Defocusin "I# ("ereira et al 2) *llow imaes to 'ecome defocused
+inle camera? color 66D, particle imae trac1in
$ ultiple-sheet "I# (Baffel et al,0CC. ) ultiple laser liht sheet, sinle camera
$ D scannin "I# (!rc1er, 0CCE) +cannin a D volume with a laser 'eam
+inle hih speed camera
3, or 3.component "I# &ystems3, or 3.component "I# &ystems
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&tereo "I# configurationsa. Translation systems
(lateral displacement)
b. otational systems
(an!"lar displacement)
Sc#eimpfl"! condition
3, or 3.component "I# &ystems3, or 3.component "I# &ystems
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&tereo "I# data reduction
- @ranslation systems (n4di?do)
3, or 3.component "I# &ystems3, or 3.component "I# &ystems
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&tereo "I# data reduction
- Botational system (nconstant)
3, or 3.component "I# &ystems3, or 3.component "I# &ystems
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@olographic "I# $@"I#% &ystem@olographic "I# $@"I#% &ystem
@olographic diagnostics of a 3, particle filed
a Aoloram recordin
' Aoloram reconstruction
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@olographic "I# $@"I#% &ystem@olographic "I# $@"I#% &ystem
@olographic recording of particles
Interference pattern in a A"I# recordin
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@olographic "I# $@"I#% &ystem@olographic "I# $@"I#% &ystem
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@olographic "I# $@"I#% &ystem@olographic "I# $@"I#% &ystem
;*ample of @"I# system $recording%
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@olographic "I# $@"I#% &ystem@olographic "I# $@"I#% &ystem
;*ample of @"I# system $reconstruction%
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"ractice with 8D"I# software
0 Bead 8D"I# help manual pae to 1now details in FBaw Imae %ormatG window
2 Open imaes in application e7ample 9 with 8D"I# and loo1 at imae details
8D"I# software and sample imaes are availa'le at httpH??wwwedpivcom?
@omeworA@omeworA
