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Crack detection using Non- Linear Wave Modulation Spectroscopy
Blekinge Institute of Technology, School of Engineering.
Blekinge Institute of Technology, School of Engineering.
2003 (English)Independent thesis Advanced level (degree of Master (Two Years))Student thesis
Abstract [en]

This report comprises an investigation of the non-linear ultrasonic crack detection method; Non-Linear Wave Modulation Spectroscopy, NWMS. Cracks in test objects were according to the NWMS method detected through their non-linearity. The non-linearity was observed as sum and difference frequencies for an ultrasonic signal interacting with a low frequency signal in the test objects. A test setup and test procedure was developed and an Excel program for a rational suggested quantification of non-linearity was written. The method was applied and evaluated on cracked and non-cracked rotor blades for jet engines.

Place, publisher, year, edition, pages
2003. , 130 p.
Keyword [en]
NWMS, Rotor blade, Micro crack, Excel, Theoretical derivation, Experimental implification
National Category
Mechanical Engineering
URN: urn:nbn:se:bth-3017Local ID: diva2:830312
Available from: 2015-04-22 Created: 2010-06-04 Last updated: 2015-06-30Bibliographically approved

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