| 复频聚焦超声压电换能器声场及频谱的研究 |
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| 引用本文： | 石焕文,尚志远.复频聚焦超声压电换能器声场及频谱的研究[J].压电与声光,2000,22(2):98-100. |
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| 作者姓名： | 石焕文 尚志远 |
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| 作者单位： | 陕西师范大学,应用声学研究所,西安,710062 |
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| 基金项目： | 国家自然科学基金资助项目（19874042） |
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| 摘 要： | 研制了一种新型复频变超声换能器,并从理论上计算了辐射声压在轴向上的分布曲线,进而确定了焦区位置,这与实验所得结果符合得较好。文章还对换能器在水中焦区辐射声场的频谱进行了研究,观测到了两个原波。和频波,差频波及倍频波,证实了声散射声效应的存在。
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| 关 键 词： | 复频聚焦超声 压电换能器 声场 频谱 |
Study on the Acoustic Field and Its Spec trum Radiated by a Bi-frequency Ultraso nic Focused Piezoelectric Transducer |
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| SHI Huan-wen,SHANG Zhi-yuan.Study on the Acoustic Field and Its Spec trum Radiated by a Bi-frequency Ultraso nic Focused Piezoelectric Transducer[J].Piezoelectrics & Acoustooptics,2000,22(2):98-100. |
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| Authors: | SHI Huan-wen SHANG Zhi-yuan |
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| Abstract: | A new kind of bi-frequency ultrasonic focused piezoelectric transducer is designed. and the distribution curve of its axial pressure is theoretically calculated. Its focal area is determined and it is good in agreement with experimental results. In this paper the spectrum of the focal acoustic field radiated by the transducer in water is investigated. Not only the two original waves but also the sum frequency, difference frequency and multiple frequency waves have been detected, which testify to the occurrence of scattering of sound by sound. |
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| Keywords: | bi-frequency focused ultrasound piezoelectric transducer acoustic field spectrum |
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