hvi measurement principles_by_abubakkar marwat
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HVI High Volume TestingHVI High Volume TestingHVI High Volume TestingHVI High Volume Testing
HVI Measurement Principles:
Overview of each measurement Factors influencing test results
calibration accuracy and precision
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USTERUSTER®® HVIHVIUSTERUSTER®® HVIHVI
• Test Report
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Basic Measurements of cotton (bales): Length, Uniformity Strength Color Trash
NEW on HVI SPECTRUM: Maturity Short Fiber Index
USTERUSTER®® HVIHVIUSTERUSTER®® HVIHVI
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Pulling a Length StaplePulling a Length Staple
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Example:Example:
1 inch = staple class 32 32:32 = 1
1 1/16 inch = staple class 34 34:32 = 1 1/16
1 1/2 inch = staple class 48 48:32 = 1 1/2
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Relationship Between Classer’s Call Relationship Between Classer’s Call and HVI Length Resultsand HVI Length Results
Inches UHM [inches] UHM [mm] Code
unter 13/16 < 0.79 < 20.1 2413/16 0.80 - 0.85 20.1 - 21.6 267/8 0.86 - 0.89 21.8 - 22.6 2829/32 0.90 - 0.92 22.9 - 23.4 2915/16 0.93 - 0.95 23.6 - 24.1 30
31/32 0.96 - 0.98 24.4 - 24.9 311 0.99 - 1.01 25.1 - 25.8 321 1/32 1.02 - 1.04 25.9 - 26.4 331 1/16 1.05 - 1.07 26.7 - 27.2 341 3/32 1.08 - 1.10 27.4 - 27.9 35
1 1/8 1.11 - 1.13 28.2 - 28.7 361 5/32 1.14 - 1.17 29.0 - 29.7 371 3/16 1.18 - 1.20 30.0 - 30.5 381 7/32 1.21 - 1.23 30.7 - 31.2 391 1/4 1.24 - 1.26 31.5 - 32.0 40
1 9/32 1.27 - 1.29 32.3 - 32.8 411 5/16 1.30 - 1.32 33.0 - 33.5 421 11/32 1.33 - 1.35 33.8 - 34.3 431 3/8 > 1.38 > 35.0 44
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Fiber BeardComb
HomePosition
Breaker Jaws
Breaker Jaws
LED
D2 = Lens to BreakD1 = Length Standard
HVI Length & StrengthHVI Length & Strength
Measurement PrincipleMeasurement Principle
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Span Length -Span Length -Principle of MeasurementPrinciple of Measurement
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Mean Length - Mean Length - Principle of MeasurementPrinciple of Measurement
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Upper Half Mean Length -Upper Half Mean Length -Principle of MeasurementPrinciple of Measurement
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Comparison of Span and Mean LengthsComparison of Span and Mean Lengths
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Uniformity Ratio and Uniformity IndexUniformity Ratio and Uniformity Index
Uniformity Ratio UR = 50% SL x 100
2.5% SL
Uniformity Index UI = ML x 100
UHML
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Uniformity - EvaluationUniformity - Evaluation
Description Uniformity Ratio50%SL / 2.5%SL
Uniformity IndexML / UHML
very low 41 & lower 77 & lowerlow 41 - 43 77 - 79
average 44 - 46 80 - 82high 47 - 48 83 - 85
very high 48 & higher 85 & higher
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USTER® HVI SPECTRUMUSTER® HVI SPECTRUM
Features & Benefits:
Accurate and precise Short Fiber Index -
Detects high short fiber content bales quickly and
accurately
Proven algorithm under evaluation by USDA
High correlation to AFIS Short Fiber Content
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USTER® HVI SPECTRUMUSTER® HVI SPECTRUM
Staple Standards Staple Standards Evaluation CottonsEvaluation Cottons Test - r = 0.98 Test - r = 0.98
6
8
10
12
14
16
31 32 32 34 35 36 37 38
Sh
ort
Fib
er C
on
ten
t/ I
nd
ex [
%]
AFIS HVI
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Cotton Fiber StructureCotton Fiber Structure
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Bundle Fiber Strength - Bundle Fiber Strength - Principle of MeasurementPrinciple of Measurement
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* Calibrated to HVI Cal. Cottons
Bundle Fiber Strength - EvaluationBundle Fiber Strength - Evaluation
Description Pressley 0" MPSI(1000) lbs/in^2
Pressley 1/8"g/tex
Stelometer 1/8"g/tex
HVI 1/8"*g/tex
very low 70 – 78 21 & lower 17 & lower 21 & lowerlow 77 – 83 21 – 23 17 – 19 22 - 24average 84 – 90 24 – 26 20 – 22 25 – 27high 91 – 97 27 – 29 23 – 25 28 – 30very high 98 – 104 30 & higher 26 & higher 31 & higher
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MicronaireMicronaire
Measurement PrincipleMeasurement Principle
1. Closing Valve
2. Pressure Regulating Valve
3. Air Measuring Device
4. Pressure Change Measuring Device
5. Measuring Chamber with Fibers
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Relationship Between Maturity and Relationship Between Maturity and MicronaireMicronaire
Fine and immature, very low Micronaire
Fine and mature, low Micronaire
Coarse and immature, low Micronaire
Coarse and mature, high Micronaire
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Micronaire - EvaluationMicronaire - Evaluationsmaller than 3.0
= very fine small perimeter and mature or medium
perimeter and immature
3.1 to 3.6 = fine small to medium perimeter with different
degrees of maturity
3.7 to 4.7 = average medium perimeter with different degrees
of maturity
4.8 to 5.9 = coarse medium perimeter and mature or
large perimeter and immature
greater than 6.0
= very coarse large perimeter with different degrees
of maturity
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Low
Micronaire &
“fairly mature”
High
Micronaire &
“well mature”
Medium
Micronaire &
“fairly mature”
Medium
Micronaire &
“less mature”
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USTER® HVI SPECTRUMUSTER® HVI SPECTRUM
Features & Benefits:
Accurate and precise Maturity Index -
Detects potential immature bales quickly and
accurately
Advanced algorithm compares well to AFIS
Maturity Ratio
No special sample preparation necessary
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USTER® HVI SPECTRUMUSTER® HVI SPECTRUM
0.6
0.8
1
1.2
1 6 11 16 21 26 31 36 41 46 51 56 61 66 71
Mat
uri
ty R
atio
AFIS HVI
International Cotton Samples - r = 0.93International Cotton Samples - r = 0.93
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HVI Color & TrashHVI Color & Trash
Measurement PrincipleMeasurement Principle
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Color Range of Cotton Color Range of Cotton
• Two-dimensional color range
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HVI ColorHVI Color
• U.S. Upland color chart
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HVI ColorHVI Color
• 80-85% of U.S. cotton crop falls within this color range
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HVI ColorHVI Color
• Typical color distribution of U.S. cotton crop
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HVI ColorHVI Color
• Color chart for American Pima cottons
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U.S. Upland U.S. Upland Cotton Cotton StandardsStandards
Color Grade Symbols Code Leaf CodeWhiteGood MiddlingStrict MiddlingMiddlingStrict Low MiddlingLow MiddlingStrict Good OrdinaryGood Ordinary
GMSMMidSLMLMSGOGO
11213141516171
1234567
Light SpottedGood MiddlingStrict MiddlingMiddlingStrict Low MiddlingLow MiddlingStrict Good Ordinary
GM Lt SpSM Lt SpMid Lt SpSLM Lt SpLM Lt SpSGO Lt Sp
122232425262
123456
SpottedGood MiddlingStrict MiddlingMiddlingStrict Low MiddlingLow MiddlingStrict Good Ordinary
GM SpSM SpMid SpSLM SpLM SpSGO Sp
132333435363
123456
TingedStrict MiddlingMiddlingStrict Low MiddlingLow Middling
SM TgMid TgSLM TgLM Tg
24344454
2345
Yellow StainedStrict MiddlingMiddling
SM YSMid YS
2535
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• Grade descriptions
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Trash - Trash - Measurement PrincipleMeasurement Principle
Video Image
Analysis
Results:
% Area (covered)
(Particle)Count
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Relationship of Trash Measurement to Relationship of Trash Measurement to Classer’s Leaf Grade*Classer’s Leaf Grade*
Classer‘s Leaf Grade
Trash Measurement
(% area)
1 2 3 4 5 6 7 8
<= 0.08 <= 0.12 <= 0.18 <= 0.34 <= 0.55 <= 0.86 <= 1.56 > 1.56
* 1999 USDA crop data (4 year average)* 1999 USDA crop data (4 year average)