Microsoft PowerPoint - Anx J-1 D\355a 1 chile- calibracion

The National Metrology Network of Chile &
An Experience on Wood Volume Measurement
National Metrology Network
Speaker: Francisco García Leoro
CESMEC - National Metrology Network
fgarcia@metrologia.cl
National Metrology Network
National Metrology Network
Contact person:
Rubén Verdugo, INN Metrology Division Head
e-mail: ruben.verdugo@inn.cl
CESMEC - Bureau Veritas - National Metrology Network
www.metrologia.cl
2009
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CESMEC - Bureau Veritas - National Metrology Network
2009
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National Metrology Network
► SIM CMC’s lines: 4284 (54% in physics, 30% in chemistry, 16% in
ionizing radiation)
► EURAMET CMC’s lines: 10330 (69% in physics, 15% in chemistry, 15%
in ionizing radiation)
Wood volume measurement
Chilean CMC’s
lines:
48
(43 in physics and
5 in chemistry)
CESMEC - Bureau Veritas - National Metrology Network
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Measurand definition
Measurand definition
► The“Metro Ruma”
► The “Metro Ruma”
2,54 m
1m
1m
1m
2,54 m
Volume occupied by a log pile with the following dimentions: 2,54 m x 1 m x 1
m. The space between the logs is also included.
CESMEC - Bureau Veritas - National Metrology Network
2009
1m
7
Measurand definition
CESMEC - Bureau Veritas - National Metrology Network
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The problem
► The “Metro Ruma”
~ USD 30/ ton
1m
V ±10% V
2,54 m
1m
~ USD 500 / ton
CESMEC - Bureau Veritas - National Metrology Network
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The problem
CESMEC - Bureau Veritas - National Metrology Network
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Measurand definition
► The“Metro Ruma”
…and transportation
CESMEC - Bureau Veritas - National Metrology Network
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CESMEC - Bureau Veritas - National Metrology Network
Solution
Definición de mensurando
► Portal 3D
► El “Metro Ruma”
Some considerations
http://www.portal3d.cl
CESMEC - Bureau Veritas - National Metrology Network
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Calibration proposals
CESMEC - Bureau Veritas - National Metrology Network
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2009
Calibration proposals
To simulate the wood pile external sufarce (remember that the system
can’t not see what is inside)
To evaluate the system error having in consideration three factors:
truck displacement speed, log diameter and stowage.
This solution is in implementation and hopefully ready for march this
year.
yijkl = µ + α i + β j + γ k + (αβ )ij + (βγ ) jk + (αβγ )ijk + (αγ )ik + ε ijkl
To use high density polyethylene pipes as reference standards
Advantage: high stability, durability, robustness, easy to measure.
Disadvantage: USD 100000
To use PVC
Advantage: cheaper, high stability, durability, robustness
Disadvantage: USD 30000, deformation
To use expanded polystyrene
Advantage: cheaper
Nowadays test are done with standards that do not allow us to evaluate
all factors’ effects, but speed only. They are less obvious but quite
useful…
Disadvantage: USD 10000 (too expensive for a short life material)
CESMEC - Bureau Veritas - National Metrology Network
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Calibration proposals
Is there any simpler
idea?
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2009
Calibration steps
Volume determination of the wood cubes
y i = β 0 + β1 x + ε i
2403
mm
2402
2403 mm
mm
2401
mm
2309
mm
2304
mm
2303
mm
2308
mm
2305
mm
2307
mm
2406
mm
2405
mm
2404
mm
2406
mm
2404
mm
2303
mm
2310
mm
2300
mm
1900
mm1896
1897
mm
1901
1900mm
1897
mm
1897
mm
Identificación Volumen /
m3
07-QE-400-A
07-QE-400-B
Total
CESMEC - Bureau Veritas - National Metrology Network
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10,52
10,50
21,02
1898
mm
1898
mm
1901 mm
mm
1901mm
1898mm
mm
Incertidumbre
expandida k=2 /
m3
Volumen /
MR
Incertidumbre
expandida k=2 /
MR
0,04
0,05
0,06
4,31
4,30
8,61
0,02
0,02
0,02
CESMEC - Bureau Veritas - National Metrology Network
U~0,3%
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Calibration steps
System readings for the truck
Error [%] del Portal vs. Velocidad [km/h]
-1,5
-2,0
Error [%]
-2,5
-3,0
-3,5
-4,0
-4,5
1,0
1,5
2,0
Velocidad [km/h]
2,5
3,0
2
U = 2 uregresión
+ u 2patrón = 2 0,3% 2 + 0,15% 2 = 0,7%
From the expression used for the evaluation of prediction intervals
CESMEC - Bureau Veritas - National Metrology Network
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CESMEC - Bureau Veritas - National Metrology Network
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