3 About an Initial Draft of a Standard Concerning Sensitivity Verification …
39
in blue: V103 Olympus 1 MHz UT probe, often used as wideband AE sensor.
in red: VS150M Vallen 150 kHz resonant sensor.
in blue: VS900M Vallen multi-resonant sensor.
3.7 Conclusion
The initial draft comprises 31 pages and deals with many details. Only few can be
treated in such short manuscript. Some complexity was introduced while solving
bottlenecks of the used LVM-setup:
• LVM sampling rate of velocity signal is only 2.56 MS/s and needs interpolation
to 10 or 40 MS/s.
• LVM-internal high-pass of velocity signal causes −3 dB loss already at about
60 kHz. This can be compensated (see VT in Fig. 3.3) but this adds complexity.
• Velocity measurement buries some low-frequency displacement info below noise.
Meanwhile another laser vibrometer product has been evaluated which eliminates these bottlenecks. In addition, Prof. Kanji Ono published recently a new
paper [8] titled “Progress in Sensitivity Verification of AE Sensors” that includes
recommendations for consideration in a new standard.
We feel obliged to consider such advice before submitting a first ISO working
draft (WD). The availability of a 1st official WD is now planned for the end of January
2020.
Acknowledgements We are thankful for the many suggestions and representations received from
Professor Kanji Ono and the lot of experience he distributed in recent publications concerning AE
sensor verification, especially in [4–9].
References
1. ISO 12713:1998(E), Non-destructive testing—Acoustic emission inspection—Primary calibration of transducers, International Organization for Standardization, Geneva, Switzerland
2. ISO 12714:1999, Non-destructive testing—Acoustic emission inspection—Secondary calibration of acoustic emission sensors, International Organization for Standardization, Geneva,
Switzerland,
3. ISO/TR 13115:2011, Non-destructive testing—Methods for absolute calibration of acoustic
emission transducers by the reciprocity technique, International Organization for Standardization, Geneva, Switzerland
4. K. Ono, Calibration methods of acoustic emission sensors. Materials 9, 508 (2016). https://doi.
org/10.3390/ma9070508
5. K. Ono, Critical examination of ultrasonic transducer characteristics and calibration methods.
RNDE (2017). https://doi.org/10.1080/09349847.2017.1375585
39
in blue: V103 Olympus 1 MHz UT probe, often used as wideband AE sensor.
in red: VS150M Vallen 150 kHz resonant sensor.
in blue: VS900M Vallen multi-resonant sensor.
3.7 Conclusion
The initial draft comprises 31 pages and deals with many details. Only few can be
treated in such short manuscript. Some complexity was introduced while solving
bottlenecks of the used LVM-setup:
• LVM sampling rate of velocity signal is only 2.56 MS/s and needs interpolation
to 10 or 40 MS/s.
• LVM-internal high-pass of velocity signal causes −3 dB loss already at about
60 kHz. This can be compensated (see VT in Fig. 3.3) but this adds complexity.
• Velocity measurement buries some low-frequency displacement info below noise.
Meanwhile another laser vibrometer product has been evaluated which eliminates these bottlenecks. In addition, Prof. Kanji Ono published recently a new
paper [8] titled “Progress in Sensitivity Verification of AE Sensors” that includes
recommendations for consideration in a new standard.
We feel obliged to consider such advice before submitting a first ISO working
draft (WD). The availability of a 1st official WD is now planned for the end of January
2020.
Acknowledgements We are thankful for the many suggestions and representations received from
Professor Kanji Ono and the lot of experience he distributed in recent publications concerning AE
sensor verification, especially in [4–9].
References
1. ISO 12713:1998(E), Non-destructive testing—Acoustic emission inspection—Primary calibration of transducers, International Organization for Standardization, Geneva, Switzerland
2. ISO 12714:1999, Non-destructive testing—Acoustic emission inspection—Secondary calibration of acoustic emission sensors, International Organization for Standardization, Geneva,
Switzerland,
3. ISO/TR 13115:2011, Non-destructive testing—Methods for absolute calibration of acoustic
emission transducers by the reciprocity technique, International Organization for Standardization, Geneva, Switzerland
4. K. Ono, Calibration methods of acoustic emission sensors. Materials 9, 508 (2016). https://doi.
org/10.3390/ma9070508
5. K. Ono, Critical examination of ultrasonic transducer characteristics and calibration methods.
RNDE (2017). https://doi.org/10.1080/09349847.2017.1375585