1 / 23

IAGA 2010, China Changchun

IAGA 2010, China Changchun A Proposal for a APMP Key Comparison of a Scalar Quantum Magnetometers in the Geomagnetic Range. Po Gyu Park. Korea Research Institute of Standards and Science (KRISS). V. Ya. Shifrin. D. I. Mendeleyev Institute for Metrology(VNIIM).

shanon
Download Presentation

IAGA 2010, China Changchun

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IAGA 2010, China Changchun A Proposal for a APMP Key Comparison of a Scalar Quantum Magnetometers in the Geomagnetic Range Po Gyu Park Korea Research Institute of Standards and Science (KRISS) V. Ya. Shifrin D. I. Mendeleyev Institute for Metrology(VNIIM)

  2. I. Introduction Taking into consideration Resolution 4 of the 21st CGPM concerning the need to use SI units in studies of Earth resources, the environment, human well-being and related issues. Geomagnetic Observatories has presently a worst case accuracy level of a few nanotesla and that it is necessary to obtain an accuracy at the level of 0.1 nT. We would like to ask for you support in organizing within the APMP a key comparison of magnetic flux density(MFD) standards in the geomagnetic range from 20 μT to 100 μT.

  3. I. Introduction This idea was approved at the 22nd CCEM meeting CCEM/WGKC/2000-12). However it has not been realized till now at the CCEM level. We are asking for your support in organizing and running the comparison campaign, in which KRISS and VNIIM could be co-pilots laboratories, with 4 to 6 participating countries of the APMP region and we expect also participation in this comparison not only of the National Metrology Institutes (NMI), but also the Earth’s Magnetic Field (EMF) observatories.

  4. CGPM (Conference Generale des Poids et Mesures, General Conference of Weights and Measures) • 48 Member countries Meter Convention CIPM (Comit'e Internationale des Poids et Mesures, International Committee on Weights and Measures) • Held every 4 years CGPM APMP EUROMET • Held every year • CIPM CCEM, CCL, CCM • Regional Metrology Organizations (RMOs) • Consultative Committees BIPM BIPM (Bureau International des Poids et Mesures, International Bureau of Weights and Measures] KRISS, NIST • National Metrology Institutes (NMIs)

  5. 국제표준기구 • BIPM/CIPM • ILAC • RMO : Regional Metrology Organization EURAMET SIM SADCMET COOMET APMP • RCAB : Regional Coop. of Accreditation Body EA : Europe IAAC : America SADCA : Africa CAS-MAS-Q APLAC : Asia

  6. 국제표International Accreditation Forum International Organization of Legal Metrology • 준력 International Laboratory Accreditation Cooperation • CIPM-ILAC MoU : Signed on November 3, 2001 • IAF-ILAC-ISO MoU : Signed on March 25, 2004 • ILAC-OIML MoU : Signed on November 12, 2006 • Common Statement and Declaration by BIPM, OIML and ILAC : Signed on January 23, 2006

  7. VARIOUS RMOs OF THE WORLD It was left to the regional metrology organizations (RMOs) to develop guidelines for acceptable quality systems. In case of our laboratory RMO is Asia Pacific Metrology Program (APMP).

  8. II. Motivations (technical limitations) 1. Shielded proton gyromagnetic ratio - Physical fundamental constant ; P(gamma prime p) definition : pure water(H20), spherical shape, 25oC - Proton and Overhauser magnetometers used to Kerosene, Alcohol, etc (cylin. shape) 2. Optical pumping magnetometer(Cs, K, Rb..): vapor gas, no absolute(relative) 3. Phase shifts : NMR signal damping 4. Heading Error (magnetic impurities in sensors, use extremely low magnetic permeability) * Overhauser : omnidirectional sensor (no dead zone and no heading error:theory) * Some optically pumped magnetometers have an inherent heading error 5. Reference Frequency ( proton : 0.0426 Hz - 1 nT)

  9. III. Process of KC (APMP.EM.M-X) • Transfer std. scalar magnetometers (Proton, Cs , K…) from participators to KRISS * KRISS, VNIIM, NIM(China), NPLI(India), Kakioka?(Japan), NMIA?(Australia), CMC?(Tiwan), SIRIM?(Maleysia) • Comparison between KRISS/VNIIM std scalar magnetometers • KRISS/VNIIM report for KC (protocol and KC results-draftA, B) • Corrections of measurement data and evaluate the measurement uncertainties for each scalar magnetometer. * Participation deadline : 31 Oct. 2010

  10. Process of KC (APMP.EM.M-X) EMF obs2 EMF obs1 EMF obs2 EMF obs3 EMF std EMF obs3 NMI2 EMF obs1 NMI1 No EMF std KRISS/VNIIM EMF obs1 NMI3 NMI4 EMF obs1 EMF std No EMF std EMF obs2 Scalar magnetometers (proton, Cs, K,…) send to KRISS for KC

  11. IV. Magnetic Flux Density Standard (KRISS) Nonmagnetic Observatory Lab. Lab. 50 m P.M EMF compensation Ver Current sources E - W Main 3-component coils N-S He AMR Auxiliary 3-component coils magnetometer Oil bath He W Cs AMR main 0 + - Cs current source Solenoid Current - + U reproducing set 0 Frequency Phase synthesizer comparator T.V. EMF compensation GPS Cs-AMR Freq . Std. controller Traceability of MFD standards at KRISS

  12. Photograph of KRISS MFD std

  13. Magnetic Flux Density Standard (VNIIM) • Current • stabilizer • (horizontal) • Magnetometer • to calibrate • One-volume MFD stabilizer • Two-volume MFD stabilizer • 3-component MFD coils • 3-component MFD coils • Correcting variations • coils • 6-component • dipoles and • coils system • Сs • AC-MF • compen- • sator • Cs • He • . • MFD-gradient • compensator • StandardСs-He • magntometer • Сs-АМR • sensor • Current • stabilizer • (vertical) • Сs-АМR • sensor • Phase detector • Phase detector • Voltage • calibrator • Current stabilizer • E-W • Frequency • synthesizer • Frequency • synthesizer • Computer

  14. Photograph of VNIIM MFD std

  15. VI. CCEM KC Results (2001, CCEM.M-K1, DC) • KRISS VNIIM

  16. V. Ya. Shifrin, Po Gyu Park et al., “Experimental estimation of the accuracy of medern scalar quantum magnetometer…”, Phys. Ear. Plan. Inter. 166(2), pp.147-152(2008).

  17. VII. Discussion ♦ Proposal to organize APMP comparisons of the magnetic flux density standards in a geomagnetic range from 20 µТ to 100 µТ with KRISS and VNIIM co-pilot laboratories(Type A:(0.1 – 0.02) nT, B:(0.1 – 0.2 ) nT) ♦ Participation in this key comparison not only of the National Metrology Institutes (NMI), but also the Geomagnetic Observatories. ♦ KRISS, VNIIM, NIM(China), NPLI(India), Kakioka?(Japan), NMIA?(Australia), CMC?(Tiwan), SIRIM?(Malaysia) ♦ Participation deadline : 31 Oct. 2010

  18. References • V. Ya. Shifrin, Po Gyu Park et al., “Experimental estimation of the accuracy of medern scalar quantum magnetometer…”, Phys. Ear. Plan. Inter. 166(2), pp.147-152(2008). • P. G. park, Y. G. Kim, V. Ya. Shifrin, "Maintenance of Magnetic Flux Density Standards on the Basis of Proton Gyromagnetic Ratio at KRISS" IEEE Trans. Instrum. Meas. 54(2), pp.734-737(2005). • V. Ya. Shifrin, V.N.Khorev, A.Ye.Shilov and P.G.Park, “The long-term stability of an atomic magnetic resonance standard system…’, IEEE Trans. Instrum. Meas. 52(2), pp.433-435(2003). • P. G. Park, Y. G. Kim, V. Ya. Shifrin, and V. N. Khorev, "Precise standard system for low dc magnetic field reproduction", Rev. Sci. Instrum., 73(8), pp.3107-3111(2002). • V. Ya. Shifrin, E. B. Alexandrov, T. I. Chikvadze, V. N. Khorev, Po Gyu Park, “Magnetic flux density standard for geomagnetometer”, Metrologia, 37(3), pp.219-227 (2000). • V. Ya. Shifrin, Po Gyu Park, V. N. Khorev, Chang Ho Choi, C. S. Kim, “A New Low-Field Determination of the Proton Gyromagnetic Ratio in Water”, IEEE Trans. Instrum. Meas. 47(3), pp.638-643(1998). • V. Ya. Shifrin, Po Gyu Park, Cheol Gi Kim, V.N. Khorev, Chang Ho Choi, “Experimental Determination of the Gyromagnetic Ratio of the He-4 Atom in Terms of that of the He-3 Nucleus”, IEEE. Trans. Meas. Instrum IEEE Trans. Instrum. Meas. 46(2), pp. 97-100 (1997). • P. J. Mhor, B. N. Taylor and D. B. Newell, “CODATA recommended values of the fundamental physical constant : 2006”, Rev. Mod. Phys., vol. 80,pp. 633~730, April~ June 2008 9. K. Weyand, “Draft B for key comparison CCEM.M-K1, Magnetic flux density by means of a transfer standard coil”, PTB, Oct., 2003.

  19. The End Thank you

  20. Realization of magnetic field unit O SI Unit : Wb, T, A/m X CGS : Mx. G, Oe Magnetic flux density (B, T = Wb/m2) 1. B generated by a solenoid with known dimensions : carrying a current known in terms of A90 (T90 ∝ A90 ∝ e) 2. B determined by measuring the force on a conductor with known dimensions : carrying a current known in terms of A90(T90 ∝ 1/A90 ∝ 1/e) 3. B determined by measuring the NMR frequency of a spherical H2O sample with the proton gyromagnetic ratio ( T90 ∝(h/ 5 )1/2) *B.N Taylor, IEEE Trans. Instrum. Meas., 50(2), pp.563-567, April(2001) B = oKBI F = BIL

  21. Traceability of magnetic flux density standards KRISS • NMR & Electromagnet : 40 mT - 2.5 T • Helmholtz coil : 1 mT – 40 mT • Low MFD standard : below 1.2 mT Nonmagnetic facilities EMF compensation Precision quartz solenoid ω4He=γ4He∙B KRISS-VNIIM Results P = 2.675 154 18 x 108 s-1 T-1 (0.18 x 10-6) 3He = 2.037 895 61 x 108 s-1 T-1 (0.18 x 10-6) 4He = 1 760.788 19 x 108 s-1 T-1 (0.18 x 10-6) Traceability of MFD standards at KRISS

More Related