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Developments in Metrology. Ed W.B. de Leer NMi Van Swinden Laboratorium The Netherlands. UNECE WP.6 Presentation 24 november 2004. Measurement Process. Measurand. Validation, Measurement Uncertainty. SI. Primary Procedure. Primary Standard. Secondary Standards. - PowerPoint PPT Presentation
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1
Developments in Metrology
Ed W.B. de LeerNMi Van Swinden Laboratorium
The Netherlands
UNECE WP.6 Presentation 24 november 2004
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Secondary Standards
SI
Measurand
MeasurementResult
Measurement Process
PrimaryStandard
Calibrated Instrument
s
PrimaryProcedure
Validation,Measurement Uncertainty
Traceability
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Traceability to the SI
Harmonizedlegal regulations
ValidatedMeasurement Methods
Competence of conformity assessment bodies
World Measurement System
NMI´sNMI´s
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Metre Convention
5
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BIPM
Scientific centre for metrology: custodian of the kilogram and the time
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EUROMET
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CIPM MRA
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Mutual recognition
Mutual recognition of calibration certificates is based on
1. Results obtained in BIPM or regional key comparisons
2. Successful implementation of a quality system based on the principles of ISO/IEC 17025 and, where relevant, ISO Guide 34.The recognition of the QMS can be based on accreditation, peer evaluation or self declaration.In EUROMET, the quality system must be presented in a QS Forum.
Key Comparisons of National Standards
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1 kg Key Comparison
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KCDB
kcdb.bipm.fr
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KCDB
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KCDB
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“High Accuracy” comparisons
All laboratories send a standard to the pilot laboratory
Preparation errors can now be Preparation errors can now be “randomised”“randomised”
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GC-TCD results
GC-TCD Results for 50,000 umol/mol CO in nitrogen
0,93
0,94
0,95
0,96
0,97
0,98
0,99
1,00
1,01
1,02
1,03
47000 47500 48000 48500 49000 49500 50000 50500 51000 51500 52000 52500
Concentration (umol/mol)
Rat
io t
o C
on
tro
l
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GLS for GC-TCD versus Gravimetry
• Conclusions for 50,000 mol/mol– Std dev of residuals is 1mol/mol (0.002% rel)-
after excluding two outliers– At 50,000 mol/mol, the gravimetric values are
very consistent within their stated uncertainties.
-80
-60
-40
-20
0
20
40
60
BAM CENAM CSIRO IPQ KRISS LNE NIST NMIJ NPL
Re
sd
iua
l De
via
tio
n (
um
ol/m
ol)
k=2k=2
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Cu in soil and sediment
0
5
10
15
20
25
30
35
40
45
50
0 5 10 15 20 25 30 35 40 45 50
Cu (mg/kg dw, certified value)
Cu
(m
g/k
g d
w,
measu
red
valu
e)
intercept: 0.55 ± 1.28 mg/ kg (k=2)slope: 0.969 ± 0.064 (k=2)
Validation of CRMs with IDMS
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Publication of draft VIM revision
• International Vocabulary in MetrologyApril, 2004
• Revision is based on the Uncertainty Approach (UA) from the GUM. Old version is based on the error concept, which is called the Classical Approach (CA)Conflict with VIML?
• The comments from ISO are approximately 60 text pages
• Uno was not accepted as a new SI unit
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Metrology in short
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GUM revision ?
• No revision of the GUM will be published
• Measurement result = value + measurement uncertainty + unit
• 4 extensions to the GUM are in preparation
• First extension on Monte Carlo calculation of measurement uncertainty published as a draft version
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Metrology and Standardization
• ISO– ISO 17000 (problem: definition of
conformity assessment activities)– ISO 17010 (problem: impartiality question)– MU concept is fully integrated in many new
standards
• CEN– MU concept is fully integrated in many new
standards
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Metrology and Accreditation
• BIPM – ILAC• Certified reference materials are the link to
the SI for most chemical measurements• Accreditation of RM producers is now possible
against ISO/IEC 17025 and ISO Guide 34 in combination
• Special calibrations of NMIs (very low uncertainties)
• Harmonization BMC and CMC• Linking key comparisons to proficiency tests
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From Cooperation to Coordination?
• European Research Area in Metrology (MERA)• Implementing the European Research Area in
Metrology (iMERA)• The metrology dilemma is budget driven:
– Do we serve the national needs in calibration?– Do we manage a profitable business?– Do we serve the future needs in metrology?
• The answer could be in coordination
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Thank you
for your attention