Lamb waves detection in a bovine cortical tibia using a scanning laser vibrometry

2008 ◽  
Author(s):  
Manik Hapsara ◽  
Daciana D. Illiescu
Keyword(s):  
Lamb Waves ◽  
Scanning Laser ◽  
Laser Vibrometry ◽  
Scanning Laser Vibrometry

2-Dimensional Visualizations of Lamb Waves Interaction With a Notch in a Bovine Cortical Tibia

2008 ◽  
Author(s):  
Manik Hapsara
Keyword(s):  
Lamb Waves ◽  
Optical Detection ◽  
Cortical Layer ◽  
Detection Technique ◽  
Scanning Laser ◽  
Laser Vibrometry ◽  
Waves Interaction ◽  
Scanning Laser Vibrometry

The objectives of this study are to observe the behavior of Lamb waves upon encountering a defect in a bone and to provide 2-d visualizations of the process. For this purposes, measurements were conducted using a non-contact optical detection technique, scanning laser vibrometry. This technique produces 2-d graphics of the Lamb waves in the cortical layer of the bone.

scholarly journals Damage detection in a composite wind turbine blade using 3D scanning laser vibrometry

2016 ◽  
Vol 231 (16) ◽  
pp. 3024-3041 ◽  
Author(s):  
Ryan Marks ◽  
Clare Gillam ◽  
Alastair Clarke ◽  
Joe Armstrong ◽  
Rhys Pullin
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Structural Integrity ◽  
Lamb Waves ◽  
Turbine Blades ◽  
3D Scanning ◽  
Scanning Laser ◽  
Laser Vibrometry ◽  
The Impact ◽  
Scanning Laser Vibrometry

As worldwide wind energy generation capacity grows, there is an increasing demand to ensure structural integrity of the turbine blades to maintain efficient and safe energy generation. Currently, traditional non-destructive testing methods and visual inspections are employed which require the turbine to be out-of-operation during the inspection periods, resulting in costly and lengthy downtime. This study experimentally investigates the potential for using Lamb waves to monitor the structural integrity of a composite wind turbine blade that has been subject to an impact representative of damage which occurs in service. 3D scanning laser vibrometry was used to measure Lamb waves excited at three different frequencies both prior to, and after, impact to identify settings for an optimal system. Signal processing techniques were applied to the datasets to successfully locate the damage and highlight regions on the structure where the Lamb wave was significantly influenced by the presence of the impact damage. Damage size resulting from the impact was found to correlate well with the laser vibrometry results. The study concluded that acousto-ultrasonic-based structural health monitoring systems have great potential for monitoring the structural integrity of wind turbine blades.

scholarly journals Synchronized-scanning laser vibrometry

2004 ◽  
Author(s):  
Benjamin J. Halkon ◽  
Steve J. Rothberg
Keyword(s):  
Scanning Laser ◽  
Laser Vibrometry ◽  
Scanning Laser Vibrometry

Reconstructing two-dimensional acoustic object fields by use of digital phase conjugation of scanning laser vibrometry recordings

2003 ◽  
Vol 42 (29) ◽  
pp. 5831 ◽  
Author(s):  
Lothar Zipser ◽  
Heinz Franke ◽  
Erik Olsson ◽  
Nils-Erik Molin ◽  
Mikael Sjödahl
Keyword(s):  
Phase Conjugation ◽  
Scanning Laser ◽  
Two Dimensional ◽  
Laser Vibrometry ◽  
Digital Phase ◽  
Scanning Laser Vibrometry
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