@article{fromme_high_2013,
	title = {High frequency guided ultrasonic waves for defect monitoring},
	volume = {134},
	issn = {0001-4966},
	url = {http://scitation.aip.org/content/asa/journal/jasa/134/5/10.1121/1.4831173},
	doi = {10.1121/1.4831173},
	abstract = {High frequency guided ultrasonic waves offer a good compromise between area coverage and defect detection sensitivity for the health monitoring of critical sections of structures. Using standard ultrasonic transducers with single sided access to the structure, guided wave modes were generated that penetrate through the complete thickness of the structure. The wave propagation and interference of the guided wave modes depends on the frequency thickness product. Laboratory experiments were conducted using a laser interferometer and the wave propagation dependence on the wall thickness reduction verified against theoretical predictions. Measurements were conducted using accelerated corrosion in a salt water bath. From the measured signal changes due to the wave mode interference the wall thickness reduction due to corrosion was monitored. The energy transfer between the plate surfaces results in a good sensitivity for the detection of small defects on both surfaces. Experimentally the reflected wave was measured using standard pulse-echo equipment. Using a combination of evaluation in the time and frequency domain, the defect location and damaged plate side can be accurately determined. The high frequency guided waves have the potential for damage monitoring at critical and difficult to access locations from a stand-off distance.},
	number = {5},
	urldate = {2014-04-03TZ},
	journal = {The Journal of the Acoustical Society of America},
	author = {Fromme, Paul},
	month = nov,
	year = {2013},
	keywords = {Acceleration measurement, Corrosion, Wave propagation, Waveguides, ultrasonics},
	pages = {4131--4131}
}

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