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CGPM 2003 CCAUV report President: Dr. Joaquín Valdés (CIPM)

CGPM 2003 CCAUV report President: Dr. Joaquín Valdés (CIPM) Executive Secretary: Dr. P. Allisy-Roberts (BIPM). CCAUV first meeting July 1999 CCAUV second meeting October 2001 CCAUV third meeting October 2002 28 delegates, 5 observers and 1 guest. CCAUV Summary of Comparison Status.

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CGPM 2003 CCAUV report President: Dr. Joaquín Valdés (CIPM)

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  1. CGPM 2003 • CCAUV report • President: Dr. Joaquín Valdés (CIPM) • Executive Secretary: Dr. P. Allisy-Roberts (BIPM)

  2. CCAUV first meeting July 1999 • CCAUV second meeting October 2001 • CCAUV third meeting October 2002 • 28 delegates, 5 observers and 1 guest

  3. CCAUV • Summary of Comparison Status

  4. Acoustics

  5. Ultrasound

  6. Vibration

  7. Classification of Services in AUVDocument CCAUV 02 - 05

  8. Future Needs for Metrology in AUVReport prepared byNPL (UK), PTB (Germany), IEN (Italy) and the President of CCAUVDocument CCAUV 02 - 33

  9. AUV and Nanotechnology Need to develop ever smaller transducers

  10. PHONON EMISSION ONE BY ONE Achieving vibrational quantum limits with nanomembranes New standards with acoustical or thermal phonons?

  11. Schematic diagram of micromachined stereocilia mounted on a membrane, with piezoresistive strain sensors to measure deflection due to microflows (W. Tang). Array of micromachined stereocilia.

  12. In the CCAUV section of the BIPM websitethere are documents of restricted access.Most of them will be now be open for free access.There is also an extense list of publications related to AUV.

  13. The unit one, • the neper and the bel

  14. Logic A (current logic) • The ratio of two quantities of the same kind is a new quantity.

  15. Logic B • Division of one quantity by other of the same kind merely express the number of times one quantity fits into the other. • This number may be just called a coefficient, a factor or a ratio, but not a new quantity. • No need to assign SI units to numbers!

  16. Logic A or Logic B? It is a matter of choice

  17. PROBLEMS associated with Logic A • CONFUSIONbetween levels, reference levels and the underlying quantities and SI units • CONFUSION through special names • CONFUSION through the use of the special name decibel with different power and field quantities such as dB(mW), dB(W), dB(0.775V), dB(V), dB(mA), dB(mV/m), dB(W/m2), dB(W/4kHz), dB(W/K), dB(W/m2kHz), dB(kHz), dB(Pa), dB(Pa/V), dB(mV/Pa) and dB(K-1)

  18. The best recommendation should be to use more the accepted SI units underlying such ratios or levels as bel or neper

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