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衰减匹配的超声Barker码激励方法

王强, 毛捷, 丁晓东, 廉国选, 胡宇安

王强, 毛捷, 丁晓东, 廉国选, 胡宇安. 衰减匹配的超声Barker码激励方法[J]. 声学学报, 2020, 45(2): 227-234. DOI: 10.15949/j.cnki.0371-0025.2020.02.009
引用本文: 王强, 毛捷, 丁晓东, 廉国选, 胡宇安. 衰减匹配的超声Barker码激励方法[J]. 声学学报, 2020, 45(2): 227-234. DOI: 10.15949/j.cnki.0371-0025.2020.02.009
WANG Qiang, MAO Jie, DING Xiaodong, LIAN Guoxuan, HU Yuan. Ultrasonic Barker-coded excitation method with attenuation matching[J]. ACTA ACUSTICA, 2020, 45(2): 227-234. DOI: 10.15949/j.cnki.0371-0025.2020.02.009
Citation: WANG Qiang, MAO Jie, DING Xiaodong, LIAN Guoxuan, HU Yuan. Ultrasonic Barker-coded excitation method with attenuation matching[J]. ACTA ACUSTICA, 2020, 45(2): 227-234. DOI: 10.15949/j.cnki.0371-0025.2020.02.009

衰减匹配的超声Barker码激励方法

基金项目: 

中国科学院创新基金项目(CXJJ-16Z220)资助

详细信息
    通讯作者:

    毛捷,E-mail:maojie@mail.ioa.ac.cn

  • PACS: 
      43.35;43.60

Ultrasonic Barker-coded excitation method with attenuation matching

  • 摘要: 为增加超声穿透高声衰减介质的能力,提出了一种衰减匹配的超声Barker码激励方法。基于换能器高斯响应与材料非频散线性衰减的假设,得到了Barker码激励的信号模型,求解旁瓣抑制滤波后脉冲压缩的信噪比表达式可知,该方法仅需要根据材料衰减特性与轴向分辨率的要求,分别调整Barker码的中心频率与时长,便可以获得更高的信噪比。取衰减系数为1.4 Np/(MHz·cm)、厚度为5 cm的橡胶为试样进行验证。当与方波激励方法的轴向分辨率相近时,衰减匹配的Barker码激励方法比传统Barker码激励方法的信噪比增益提高接近5 dB;当牺牲一定轴向分辨率时,信噪比增益提高接近11 dB。结果表明,衰减匹配的Barker码激励方法可以降低依频率衰减对脉冲压缩的影响,有效提高衰减回波的信噪比。
    Abstract: In order to increase the ability of ultrasound to penetrate the high attenuation medium,an attenuation matching method of ultrasonic Barker-coded excitation is proposed.Based on the assumption of transducer impulse response with Gaussian shape and linear phase attenuation without dispersion in material,the signal model of Barkercoded excitation is obtained.By solving the expression of signal-to-noise ratio of Barker-coded pulse compression after sidelobe suppression,it can be seen the proposed method only needs to adjust the center frequency and time duration of the Barker-coded signal according to the material attenuation characteristic and the requirement of axial resolution.Take the rubber with attenuation coefficient of 1.4 Np/(MHz·cm) and thickness of 5 cm for example.When the axial resolution of square wave excitation method is similar to that of the Barker-coded excitation method,the signal-to-noise ratio gain of attenuation matching Barker-coded excitation method is nearly 5 dB higher than that of traditional Barkercoded excitation method.Furthermore,the increasement of the signal-to-noise ration gain grows to 11 dB at the cost of the axial resolution.The results show that the attenuation matching Barker-coded excitation method can reduce the influence of frequency-dependent attenuation on pulse compression and effectively improve the signal-to-noise ratio of the attenuated echo.
  • 期刊类型引用(3)

    1. 石文泽,黄祺凯,卢超,邱发生,陈尧,陈果. 脉冲压缩在钢板腐蚀电磁超声SH导波检测中的应用. 北京航空航天大学学报. 2023(02): 324-334 . 百度学术
    2. 孟凌霄,石文泽,卢超,黄良,凌建. 基于编码压缩的纤维缠绕气瓶贴附式电磁超声检测方法研究. 仪器仪表学报. 2023(08): 82-99 . 百度学术
    3. 黄祺凯,石文泽,卢超,陈尧,董德秀. 基于编码压缩的钢板电磁超声Lamb波检测方法研究. 仪器仪表学报. 2022(02): 117-127 . 百度学术

    其他类型引用(4)

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出版历程
  • 收稿日期:  2019-04-27
  • 修回日期:  2019-07-21
  • 网络出版日期:  2022-06-26
  • 刊出日期:  2022-06-26

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