Detection of acoustically induced electromagnetic radiation
Detection of acoustically induced electromagnetic radiation
复制标题
声感应电磁辐射的检测
DOI：
10.1063/1.2374847
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发表时间：
2006
影响因子：
4
通讯作者：
S. Komiyama
中科院分区：
文献类型：
--
作者：
K. Ikushima;S. Watanuki;S. Komiyama
材料的电磁机械响应是通过超声波引起的电磁辐射来检测的。将目标样本放置在超声波的聚焦区中，距离声发生器约60 mm。辐射被调谐到超声频率的窄带环形天线拾取。由于超声波在介质（水）中传播引起的延迟时间，来自目标的脉冲电磁辐射与归因于发生器的表观信号很好地分离（时间上为± 40μs），从而允许对真实信号进行明确和灵敏的检测。在用超声波刺激时，在骨骼、木材、塑料和铁氧体以及标准压电材料（GaAs）中发现电磁辐射的发射。
Electromagnetomechanical response of materials is detected through electromagnetic radiation induced by ultrasound waves. Target specimens are placed in the focusing zone of the ultrasound waves at a distance of ∼60mm from an acoustic generator. The radiation is picked up by a narrow-band loop antenna tuned to the ultrasound frequency. Due to the delay time caused by ultrasound wave propagation in the medium (water), the pulsed electromagnetic radiation from a target is well separated (temporally by ∼40μs) from the apparent signal attributed to the generator, allowing unambiguous and sensitive detection of true signals. Upon stimulation with ultrasounds, emission of electromagnetic radiation is found in bones, woods, plastics, and ferrites as well as a standard piezoelectric material (GaAs).