NDLI: Model for thickness measurements of steel plates using half-wave resonances

Content Provider	IEEE Xplore Digital Library
Author	Waag, Grunde Hoff, Lars Norli, Petter
Copyright Year	2012
Description	Author affiliation: Institute of Micro and Nano Systems Technology, Vestfold University College, Horten, Norway (Waag, Grunde; Hoff, Lars) \|\| HalfWave AS, Høvik, Norway (Norli, Petter)
Abstract	Previously reported measurement have shown how air-coupled ultrasound transmission measurements can be used to measure the thickness of steel plates, resolving thickness variations down to 0.2 mm. Simple plane wave theory predicts that at normal incidence, the steel plate is excited into compressional resonances when the plate thickness is an integer number of half-wavelengths. No shear waves are excited at normal incidence. The plate investigated previously had thickness 10.15 mm, with half-wave resonances expected at 288.18 kHz and 576.35 kHz. Transmission measurements on this plate showed resonance peaks at 267.33 kHz, 464.63 kHz and 571.98 kHz. The former and latter values deviate by 7% and 0.7%, respectively, from the values predicted by the plane wave model. The peak at 464.6 kHz was assumed to be due to the third harmonic resonance of the shear wave, but this was not confirmed.
Starting Page	2438
Ending Page	2441
File Size	691324
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0610
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resonant frequency Frequency measurement Solids Acoustics Steel Harmonic analysis Transducers
Content Type	Text
Resource Type	Article

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