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Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October 2010 1 Hans-Jürgen von Martens Representative of ISO/TC 108.

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Presentation on theme: "Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October 2010 1 Hans-Jürgen von Martens Representative of ISO/TC 108."— Presentation transcript:

1 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October Hans-Jürgen von Martens Representative of ISO/TC 108 Report of the ISO International Observer to the 7 th Meeting of the CCAUV BIPM, Sèvres, October 2010 Recent progress of ISO TC 108/SC 3 towards key comparisons and traceability in the field of vibration and shock acceleration Draft Agenda of10/09/2008, item Doc. CCAUV/10-03 ISO/TC 108 Mechanical vibration, shock and condition monitoring ISO/TC 108/SC 3 Use and calibration of vibration and shock measuring instruments ISO/TC 108/ SC3/WG 6 Calibration of vibration and shock transducers

2 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October Contents of Doc. CCAUV/ Introduction 2 The standard series ISO “Methods for the calibration of vibration and shock transducers” (state of October 2010) 3 State of the standard series ISO 5347 “Calibration of vibration and shock pick-ups” (state of October 2010) 4 Recent progress in development and application of ISO calibration standards 4.1 Survey on standards 4.2 Measurement ranges and accuracy specified for standard techniques 4.3 Accuracy (uncertainty of measurement) achievable with refined techniques 4.4 Extended measurement ranges of standard methods 4.5 The new standard ISO Calibration of laser vibrometers 5 Summary and conclusions References Appendix A The Signal coincidence method (SCM) … Appendix B Examples of simultaneous measurements of vibrations at high frequencies …

3 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October (Introduction) Metrological application of methods specified in ISO documentary standards Motion quantity representing vibrationUnit accelerationmetre per second squared m/s² velocitymetre per second m/s displacementMetre m angular accelerationradiant per second squared rad/s² angular velocityradiant per second rad/s rotational angleradiant rad to establish key comparison reference values (KCRVs) in CIPM key comparisons to link regional key comparisons (RMO KCs) to the KCRVs to realize and disseminate six units of the International System of Units (SI) by NMIs:

4 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October ISO Calibration Basic concepts Cal. in severe environment ) Other calibration methods ) Calibration of laser vibrometers ) C al. of seismometers Primary Calibration Secondary Calibration Vibration interferometry Vibration reciprocity Shock interferometry Angular vibration interferometry Vibration comparison Shock comparison Angular vibration comparison Transverse sensitivity renumbered after revision, at present: ) zero stage project, 2) CD 3) FDIS nn 1) Dynamic force transducer calibration ) Cal. of accelerometers by model based parameter identification ) Resonance testing revised Red marked: Laser interferometry The standard series ISO “Methods for the calibration of vibration and (Section 2) shock transducers” (state of October 2010)

5 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October Former standard series ISO 5347 “Methods for the calibration of vibration and (Section 3) shock pick-ups“- parts for calibration (state of October 2010)

6 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October Former ISO 5347 series “Methods for the calibration of vibration and shock pick-ups“ (parts for testing) and state of revision (June 2010) Former standard series ISO 5347 “Methods for the calibration of vibration and (Section 3) shock pick-ups“- parts for testing (state of October 2010)

7 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October (Section 4) Features of the revised standard (2009) for Testing of transverse vibration sensitivity compared with the former version (1993) PropertyISO :1993ISO :2009 Frequency range20 Hz to 5 kHz1 Hz to 5 kHz Vibration generatorsingle-axis vibration excitersingle-axis vibration exciter two-axis vibration exciter tri-axis vibration exciter Apparatusnot specifiedDetailed specification Measurement methodnot specified Comparison Interferometry others Procedurenot sufficiently specifiedDetailed specification

8 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October Vibration generator with 3D-laser vibrometer ISO :2009 Testing of transverse vibration sensitivity (Section 4) 2 examples of various specifed calibration arrangements Vibration generator with three laser interferometers Triaxial vibration excitation and measurement by laser interferometry

9 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October PropertyISO :1999ISO (LAYOUT FDIS 2010) Frequency range0.4 Hz to 10 kHz “Typically 0.4 Hz to 50 kHz” provisions for lower and higher frequencies Vibration generatorElectrodynamic Piezoelectric (→high frequency) Measurement methodInterferometry Comparison Interferometer techniqueHomodyne Heterodyne (→high frequency) Terms and test methodsSpecified in some detailSpecified in great detail Applicability of commercial laser vibrometer standards Not includedDetailed specification Evaluation of measurement uncertainty Uncertainty components Example of uncert. evalulation Features of ISO Calibration of laser vibrometers (Section 4) compared with ISO (accelerometer calibration)

10 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October (Section 4) Example of metrological foundation of ISO standard specifications: Prove of applicability of the specified interferometer methods up to 50 kHz Example of comparisons performed between different interferometer standard methods and techniques - vibration amplitude measurements between 0.4 Hz to 347 kHz Finding: Standard methods are applicable beyond 100 kHz with high accuracy (exp. meas. unc. <1 %).

11 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October Measurement of a displacement amplitude of approximately λ/4 = nm at kHz using three interferometer methods simultaneously* * Example result from an experimental investigation performed at CENAM/ Mexico in February 2010 by G. Silva Pineda, A. Ruiz Rueda, R. Vázquez Ovando and L. Muñiz Mendoza in collaboration with H.-J. von Martens 1 %

12 Report of the ISO/TC108 Representative to the 7 th Meeting of the CCAUV BIPM, Sèvres, October The ISO TC 108/SC 3 includes recognized metrologists from NMIs worldwide along with a wide range of manufacturers and users. The ISO 5347 and standard series are under continuous development as a prerequisite to ensure world-wide uniformity and traceability in vibration mesurements. Summary and conclusions New demands addressed are: calibration of laser vibrometers and of seismometers, parameter identification of accelerometers and dynamic force transducer calibration Milestones marking great progress for various projects (e.g. ISO published, FDIS stage) were the 29th and 30th SC 3 Meetings (Nov. 2008, Sept. 2010) New standards allow special refined versions of the standard methods to be applied, which lead to even smaller uncertainty and/or wider parameter ranges. ISO TC 108 has acknowledged the BIPM and CCAUV to organize key comparisons based on adequate calibration methods specified in the ISO series of standards.


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