| 黄淳,李颂文.锁定放大技术在参量接收阵中的应用[J].声学技术,2014,33(2):180~183 |
| 锁定放大技术在参量接收阵中的应用 |
| Application of lock-in amplifier technique in parametric acoustic receiving array |
| 投稿时间：2012-12-16 修订日期：2013-03-29 |
| DOI：10.3969/j.issn1000-3630.2014.02.018 |
| 中文关键词: 锁定放大技术 参量接收阵 微弱信号探测 |
| 英文关键词: lock-in Amplifier technique parametric acoustic receiving array weak signal detection |
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| 中文摘要: |
| 为抑制泵波影响，提取参量接收阵中的微弱差频信号，根据微弱信号探测原理，设计了一个基于锁定放大技术的参量接收阵系统。简要介绍了参量接收阵原理，详细描述了锁定放大技术，以及所设计的参量接收阵系统的工作过程，给出泵波比差频高130 dB时的仿真数据。结果表明，采用锁定放大技术后的参量接收阵系统可对接收的差频信号优化约5 dB。 |
| 英文摘要: |
| In order to suppress the effect of pump signal on picking up the weak difference-frequency signal in the parametric acoustic receiving array, and according to the principle of weak signal detection, a new kind of parametric receiving system is designed on the basis of lock-in amplifier technique. The principle of parameter acoustic receiving array is described briefly, and the Lock-in amplifier technique as well as the procedure of the designed system is described in detail with the presented simulation data that pump to difference-frequency signal ratio reaches 130 dB. The result indicates that the use of lock-in amplifier technique in the parametric acoustic receiving array can optimize the difference-frequency signal by 5 dB. |
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