Generation and detection of broadband airborne ultrasound with cellular polymer ferroelectrets
Generation and detection of broadband airborne ultrasound with cellular polymer ferroelectrets
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DOI：
10.1063/1.2819090
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发表时间：
2007-11
影响因子：
4
通讯作者：
M. Dansachmuller;I. Minev;P. Bartu;I. Graz;N. Arnold;S. Bauer
中科院分区：
文献类型：
--
作者：
M. Dansachmuller;I. Minev;P. Bartu;I. Graz;N. Arnold;S. Bauer
蜂窝状聚丙烯铁驻极体可用于宽频带航空超声的产生和检测，最高可达基波厚度延伸共振。作者指出，铁驻极体与空气的耦合改变了泡沫的机电共振。在声腔中，得到了法布里-珀罗共振，这与平面波模型的计算很好地吻合。对于航空超声应用中的材料评估，使用了基于材料的机电耦合系数和声阻抗的优值系数。铁驻极体与气体的良好耦合源于材料的小声阻抗。
Cellular polypropylene ferroelectrets are useful for broadband airborne ultrasound generation and detection up to the fundamental thickness extension resonance. The authors show that the coupling of ferroelectrets to air alters the electromechanical resonance of the foam. In an acoustical cavity, Fabry-Perot resonances are obtained, which is in excellent agreement with the plane wave model calculations. For material assessment in airborne ultrasound applications, a figure of merit is used based on the electromechanical coupling factor and acoustical impedance of the material. The good coupling of ferroelectrets to gases results from the small acoustical impedance of the material.