Electromagnetic ultrasonic (EMUS) probes: State of the art and developments for application in nuclear power plants
- Fraunhofer-Inst. fuer Zerstoerungsfreie Pruefverfahren, Saarbruecken (Germany)
The excitation and detection of ultrasound by conventional piezoelectric techniques doesn`t provide the full range of elastic wave modes which can be used for NDT. Besides this there is a limitation of the temperature range. This gap can be filled up using alternative techniques for the ultrasonic transduction. One of the most far developed alternative techniques is the electromagnetic ultrasonic (EMUS) excitation and detection. EMUS-probes work free of liquid couplants; hence they can be applied for inspection and measurements at higher temperatures. The transduction of Shear waves with horizontal polarization (SH-)waves can be more reliably performed by EMUS-probes for practical applications than by piezoelectric shear wave transducers using Y-cut quartz. The contribution presents the performance of Phased-Array angle-probes. The application of these probe-type for the ISI of austenitic and dissimilar welds using SH-waves will be shortly highlighted. For the continuous monitoring of the liquid level in the vessels of BWR`s from outside at temperatures of 300 C SV-wave angle probes are used. Their performance for operation in the mentioned temperature range and the principle of measurement of the liquid level will be described. Ongoing development work to enlarge the frequency range of EMUS-probes and for the automatic control of the lift-off will be shortly described.
- OSTI ID:
- 72589
- Report Number(s):
- CONF-931061-; ISBN 0-87170-506-0; TRN: 95:015657
- Resource Relation:
- Conference: 12. international conference on non-destructive evaluation in the nuclear and pressure vessel industries, Philadelphia, PA (United States), 10-13 Oct 1993; Other Information: PBD: 1994; Related Information: Is Part Of 12th International Conference on NDE in the Nuclear and Pressure Vessel Industries; PB: 521 p.
- Country of Publication:
- United States
- Language:
- English
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