Upload
moses
View
34
Download
3
Tags:
Embed Size (px)
DESCRIPTION
A 3D Scanning System for Fabric Fuzziness and Pilling Evaluations. Bugao Xu and Ming Yao. The University of Texas at Austin January 2005. 3D Laser Scanning System. Goal to acquire the surface profile of a fabric and to characterize the surface roughness. Setup Profile sensor: 10um - PowerPoint PPT Presentation
Citation preview
1
A 3D Scanning System for Fabric Fuzziness and Pilling Evaluations
Bugao Xu and Ming Yao
The University of Texas at AustinJanuary 2005
2
3D Laser Scanning System
Goalto acquire the surface profile of a fabric
and to characterize the surface roughness.
SetupProfile sensor: 10um 2-axis stage: 0.5 um/stepA/D board: 12 bits
3
HardwareDimension: 8 x 8 x 6 inches
4
Software
5
Samples
Five knitted fabric (interlock, dark blue) were washed and dried different cycles.
F5: no fuzzF4: lowF3: mediumF2: high (a few pills)F1: severe ( a lot pills)
6
Procedures
• Scan the sample • Level the surface• Set the central plane• Select the offset plane• Calculate surface parameters
7
Scanning
Profiles, 1x1 in2
Surface, 200 DPI
Surface, 400 DPI
8
Leveling (B-spline Approximation)
u and v: two parameters
Ni,q(v) and Nj,p: basis functions
p and q: degrees
{Pi,j|0<i<m, 0<j<n}: control points
m
i
n
jjipjqi PuNvNvuS
0 0,,, )()(),(
9
LevelingScannedSurface
B-spline Fit Plane Leveled Surface
10
Offset Plane
Central Planeu=0 um
Offset Planeu=0.25um
Offset Planeu=0.3um
11
Surface Roughness(ANSI/ASME B46.1-1985)
Roughness Average Ra
Root-Mean-Square Roughness Rq
Skewness Rs
Central Lineyi
ia yN
R 1
21iq y
NR
33
1i
qs y
NRR
12
Skewness
13
Surface Roughness(ANSI/ASME B46.1-1985)
Ten-point Height Rz:
5)()( 10864297531 RRRRRRRRRRRz
14
Surface Roughness(ANSI/ASME B46.1-1985)
Bearing Length Ratio tp:
Mean Spacing Rsm:
15
Surface Roughness
Peak Count Np:
Peak Size Average Sa:
Peak Height Average Ha:
16
F5
17
F4
18
F3
19
F2
20
F1
21
Pilling
22
Results
00.20.40.60.8
11.21.4
1 2 3 4 5
RaRqRz
23
Results
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
1 2 3 4 5
Skew
tpc
Peak count
Peak size
Peak height
24
ResultsF1 F2 F3 F4 F5 F6
Ra 0.287 0.139 0.123 0.101 0.086 0.092Rq 0.365 0.181 0.158 0.127 0.110 0.140Rz 1.257 0.613 0.573 0.383 0.334 0.690Rs 0.518 0.455 0.237 0.005 -0.001 2.270tp 0.259 0.061 0.056 0.017 0.008 0.019Np 0.446 0.481 0.535 0.277 0.184 0.047Sa 0.507 0.154 0.109 0.089 0.067 0.248Ha 0.511 0.368 0.335 0.304 0.296 0.714
25
Conclusions• The selected surface parameters can
effectively differentiate the level of fabric fuzziness/pilling.
• It provides the characteristic information about fuzz and pills.
• It is independent of fabric structure, color and orientation.
• The scanning is a slow process.