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Annual Report TC PR EURAMET


    Annual Report
18th EUROMET General Assembly

           Maria Luisa Rastello
            Bled, June 2004
                       Annual Meeting
Istituto Elettrotecnico Nazionale Galileo Ferraris
Turin, Italy, April 22-23, 2004.
23 participants from 23 NMIs.

- status of CMCs.
- maintenance of EUROMET PR CMCs.
- activities of NMIs.
- status of the CCPR Key and supplementary comparisons.
- status of the EUROMET Key comparisons.
- status of the EUROMET PHORA projects.

         (from the report at the XVII GA)
Future PHORA activities: Classification criteria
for identification of quantities, parameters, etc. in
P&R metrology subject field.
- Very high investments needed.
- Specific additional expertise needed.
- Specific application needed.
- General national needs.
- Classical/basic activities /key and supplementary
Possible PHORA list:
 - Two photon radiometry.
 - Fibre optics.
 - High power lasers.
 - Synchrotron radiation, …..
EUROMET PHORA project #562
        Collaboration in research

   Two photon metrology

              Coordinator: IEN
 partners : METAS, BNM-INM, NPL, IEN, NIST
 Two photon metrology concerns the absolute
 measurement of photon quantities based on
      fundamental physical phenomena.

Application fields of two photon technique:
        Metrology: Quantum Radiometry
but also:
        Quantum Cryptography
        Chemistry, Biology and material science
        Optical fibre testing in communications and sensor
        Diode laser characterisation
        Laser ranging in space applications and telemetry
               Parametric down-conversion (PDC)

Spontaneous “decay” of a photon, inside a non-linear medium,
into a pair of correlated photons

          •energy and momentum conservation:
                            p  i   s
                                  
                            k p  ki  k s
          •simultaneous emission of the two photons

  Ref. D.N. Klyshko, Coherent photon decay in a non linear medium, Sov. Phys. JETP Lett.6,1967
       S.E.Harris et al., Observation of tunable parmetric fluorescence, Phys.Rev.Lett. 18, 1967
Absolute calibration of photodetectors

 N S  S ( S )  N
                                                         S ( S )  N c Ni
 Ni  i (i )  N                                      
 N   ( )  ( )  N                                  i (i )  N c N s
 c      S    S      i i

Ref. D.N. Klyshko, Sov. J. Quantum Electron. 10, 1112-1116,1988
  Absolute calibration of photodetectors


the deep interest in this technique is the definite possibility
of establishing references at very low levels of intensity
without turning to any other radiometric standard
Exchanging researchers and students

2000:   NPL researcher at IEN for training;
        IEN researcher at NPL partecipating in the setting up of a new PDC
        facility for absolute detector calibration by correlated photons;
        NIST researcher at IEN working on single-photon detector bilateral

2001:   BNM-INM researcher at IEN for training;

2002:   IEN researcher at NIST for partecipating in the setting up of new
        experimental facility for absolute calibrations by correlated photons;

2003:   BNM-INM researcher at IEN preparing a single-photon detector
        bilateral comparison.
The quantum efficiency of detector CP-00-A of BNM-INM has been
measured by both IEN and BNM-INM at = 633 nm.

BNM result is                 0,7412  0,0083

with a relative uncertainty of 1,1 %, while

IEN result is                 0,7412  0,0052

with a relative uncertainty of 0,7 %.
BNM-INM measured the quantum efficiency by
- the two-photon method and
- by comparison with reference detectors directly linked to the
cryogenic radiometer of BNM-INM.

           Quantum efficiency                relative uncertainty
BNM-INM(1) 0,7412 ± 0,0083                    1,1 %
BNM-INM(2) 0,6943 ± 0,047                     6,8 %
CCPR Working Group on Calibration and Measurement
Capabilities (WG-CMC)

NIST (Gaithersburg, USA), 10 May 2004

F Hengstberger (CSIR-NML)        Member(CCPR, SADCMET)
C Matamoros (CENAM)              Member (SIM)
M Stock (BIPM)                   Member (secretary of the CCPR)
J Gardner (CSIRO-NML)            Member (APMP)
M L Rastello (IEN)               Member (EUROMET)
CCPR Working Group on Calibration and Measurement
Capabilities (WG-CMC)


-     to coordinate and approve the definition of service categories
      requested by RMOs and to maintain lists of service categories,
      and - where necessary - rules for the preparation of CMC
-     to agree on detailed technical review criteria;
-     to coordinate and, if necessary, conduct inter-regional reviews
      of CMCs submitted by RMOs for posting in Appendix C of the
CCPR Working Group on Calibration and Measurement
Capabilities (WG-CMC)


-     to provide guidance on the range of CMCs supported by
      particular key and supplementary comparisons;
-     to suggest to the WG-KC areas where additional key and
      supplementary comparisons may be needed;
-     to coordinate the review of existing CMCs in the context of
      new results of key and supplementary comparisons.
MEMBERSHIP: Chairs of the Technical Committees of Regional
Metrology Organizations (RMOs) dealing with photometry and

RMOs are entitled to include technical advisors in their delegation.

Chairmanship rotates on an alphabetical basis between the RMOs.

Terms of chairpersons will commence at the start of a WG-CMC
meeting and end at the start of the next meeting. Present and incoming
chairs will jointly prepare the draft agenda for the next meeting.
The formation of the WG-CMC complies with a request of the JCRB
to all CIPM Consultative Committees to form such working groups.

Its establishment is not meant not change the review process for CMCs
in each RMO in any way.
It is only after the inter-regional review process has taken place in each
reviewing RMO that a meeting of the RMO TC chairs by way of the
WG-CMC may be useful to resolve outstanding review issues.

Where there are no issues to be resolved, the WG-CMC will not even

get involved.
Round 1: 2001 – 16 countries – 315 entries
         Parameters critical for traceability to SI units
Round 2: 2002 – 13 countries – 137 entries.
         Quantities closely related to basic ones

In conclusion:
    452 entries from 20 NMIs of 20 countries.
    All of them included in the KCDB.
       Discussion on the way forward, timetable

The range of parameters submitted during rounds 1 and 2 now has been
extended further to allow the submission of CMCs in most, if not all,
of the outstanding service categories.

An agreement has been reached on the list of these round-3 CMCs.

The JCRB would then be informed of the arrangements and RMOs
would be invited to submit round-three CMCs in these new service
categories as soon as possible after the meeting.
Round 3 service categories

Comments on new list by RMOs to WG until the end of May 2004

CMC submissions acceptable from 1 June 2004.

Executive Secretary of the CCPR: custodian of the list of service

Latest approved version of this list available asap on the BIPM
Round 4 service categories

Applications for new service categories submitted to the WG-CMC:
after the completion of round 3 at any time on an “on demand” basis.

New submissions of round 1 to 3 CMCs by RMOs acceptable at any
     Annual report
18th EUROMET General Assembly.

            Maria Luisa Rastello
             Bled, June 2004

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