| 超声频段内声子晶体滤波器的设计与仿真 |
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| 引用本文： | 张璐,孟立凡,韩建宁,杨鹏. 超声频段内声子晶体滤波器的设计与仿真[J]. 科学技术与工程, 2015, 15(16) |
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| 作者姓名： | 张璐 孟立凡 韩建宁 杨鹏 |
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| 作者单位： | 1. 中北大学仪器科学与动态测试教育部重点实验室,太原,030051
2. 中北大学信息与通信工程学院,太原,030051 |
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| 基金项目： | 国家自然科学基金(61302159)资助、国家自然科学基金(11304289)资助、山西省自然科学基金(2012011010-1)资助 |
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| 摘 要： | 目前,超声技术被广泛使用,超声频段内期望信号的质量成为关键因素。利用平面波展开法设计一种局域共振型声子晶体结构的带阻滤波器,对10 MHz以内的超声频段进行仿真分析。得出频率在4.5 MHz以下和7.25~10 MHz为通带,该频段内亦可实现信号增强;4.5~7.25 MHz为禁带,具有较好的滤波作用。所设计的声子晶体结构体积较小,可适用于小尺寸的超声探头前端,实现原始的非电量信号直接滤波。
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| 关 键 词： | 声子晶体 平面波展开法 超声滤波 带隙 |
| 收稿时间： | 2015-01-31 |
| 修稿时间： | 2015-05-11 |
Design and Simulation of Phononic Crystals Filter within Ultrasonic Frequencies |
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| ZHANG Lu,MENG Li-fan,HAN Jian-ning and YANG Peng. Design and Simulation of Phononic Crystals Filter within Ultrasonic Frequencies[J]. Science Technology and Engineering, 2015, 15(16) |
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| Authors: | ZHANG Lu MENG Li-fan HAN Jian-ning YANG Peng |
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| Abstract: | Ultrasonic technology is widely used at present, and the quality of desired signal in ultrasonic frequencies becomes a key factor. A band stop filter of locally resonant phononic crystals structure was designed with plane wave method and ultrasound frequencies less than 10MHz was on simulation analysis. The result shows that frequencies below 4.5MHz or within 7.5MHz-10MHz are assigned to pass band,which can achieve signal enhancement. Band gap is from 4.5MHz to 7.25MHz and has better effect in filtering. The phononic crystals structure of small volume can be applied to the front of smaller ultrasound probe to filter the original non-power signal directly. |
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| Keywords: | phononic crystals plane wave method ultrasonic filter band gap |
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