Finite-element modeling of acoustic chaos to sonic infrared imaging
2005; American Institute of Physics; Volume: 98; Issue: 1 Linguagem: Inglês
10.1063/1.1947382
ISSN1520-8850
AutoresXiaoyan Han, Md. Sarwar Islam, Golam Newaz, L. D. Favro, R. L. Thomas,
Tópico(s)Seismic Waves and Analysis
ResumoThe technique of sonic infrared imaging (SIR) consists of the excitation of an object with a short pulse of high-power 15–40-kHz sound, in combination with imaging of the object’s surface temperature as a function of time with an infrared video camera. SIR is effective for detecting both surface and subsurface cracks. The recent discovery of acoustic chaos has provided a means for greatly enhancing the effectiveness of SIR. Some of the authors have recently shown analytically that a simple mechanical model of a transducer, in forced contact with a structureless sample, and driven by a pure 20-kHz source will produce chaotic sound. The chaos results from the combination of the 20-kHz vibration and the bouncing of the transducer from the sample surface. Here we describe a more realistic, finite-element model, including bouncing, that also spontaneously produces chaotic sound.
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