CALIBRATION OF VIBRATION REFERENCE TRANSDUCERS WITH PRIMARY AND SECONDARY METHODS. PROPOSALS FOR HANDLING THE DEPENDANCE OF HIGH FREQUENCY RESPONSE ON MOUNTING PARAMETERS |
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| Torben R. Licht, Sven Erik Salboel, Jacob H. Winther |
- Abstract:
- Dissemination of vibration sensitivity values to the broader vibration community has been dominated over several decades by the calibrations performed at NMIs using primary vibration calibration by laser interferometry using the methods described in the ISO 5347-1 (latest edition1993) replaced by 16063-11 in 1999.
In most cases this method is applied to reference transducers, either single-ended or meant for back-to-back calibration.
In recent years there has been a push towards very low uncertainties and frequencies above 5 kHz. About 5 years ago it became evident that although the calibration at the NMIs with similar equipment could be reproduced with high confidence it is questionable if these results and uncertainties can be disseminated with sufficient confidence to the users of the reference transducers.
It has been demonstrated that the results depend on the actual mounting conditions described by the mechanical impedance of the structure which calls for recommendations for increased uncertainties and/or correction factors and methods for use of the results.
Calibration of reference transducers have in some countries been performed by using transfer standards to calibrate back-to back references for the users and naturally the results obtained and the stated uncertainties are questionable in the light of the newest discoveries.
Examples and some proposed solutions to these challenges including uncertainty calculations will be presented. - Keywords:
- vibration, calibration, interferometry, dissemination
- Download:
- IMEKO-WC-2015-TC22-432.pdf
- DOI:
- -
- Event details
- Event name:
- XXI IMEKO World Congress
- Title:
Measurement in Research and Industry
- Place:
- Prague, CZECH REPUBLIC
- Time:
- 30 August 2015 - 04 September 2015