光学学报, 2009, 29 (s1): 65, 网络出版: 2009-06-25   

一种新型的抗混叠滤波光纤水声传感器

New Anti-Aliasing Filtering Underwater Fiber-Optic Acoustic Sensors
作者单位
国防科技大学光电科学与工程学院, 湖南 长沙 410073
摘要
为了进一步改善声低通滤波光纤水声传感器对高频声信号的抑制功能, 在以往报道的二阶结构的基础上, 提出了一种新型的四阶结构。利用电声类比理论和电路分析方法, 建立了四阶声低通滤波光纤水声传感器的一般低频集中参量模型, 并对其声压频响进行了理论分析。在驻波罐中对自制的四阶光纤水声传感器进行了测试, 实验曲线与理论值具有大致相同的变化形式, 测得的两个共振频率分别与各自的理论值基本一致, 低频响平坦且非常吻合, 平均声压灵敏度为-140 dB, 高频差异较大, 主要受低频模型的限制。实验结果较好地验证了低频集中参量模型和理论分析的正确性。为解决光纤水声传感器系统实际应用中遇到的高频干扰引起的信号混叠问题提供了一种新的有效技术途径。
Abstract
To improve the high frequency attenuation qualities of the acoustic low-pass filtering underwater fiber-optic acoustic sensors, a new anti-alaising filtering fiber-optic underwater acoustic sensor with a four-order acoustic low-pass filter is proposed, which is based on the two-order structure reported previously. The general low frequency lumped parameters model of the underwater acoustic sensor is constructed based on the theories of electro-acoustic analogy, and the acoustic performance is predicted by the circuit analysis methods. To test the model and the theories, a four-order acoustic low-pass filtering fiber-optic underwater acoustic sensor is fabricated and tested in a standing-wave tube filled with water. Apart from the hight frequency response, the experimental results are well in agreement with the numerical curve. The measured low frequency response is very flat, and the acoustic sensitivity is about -140 dB. The measured two resonant frequencies are in well agreement with the corresponding numerical values, respectively. It is expected that the acoustic low-pass filtering underwater fiber-optic acoustic sensor will become a new class of sensors used to eliminate the aliasing in the future sonar systems.

王泽锋, 胡永明. 一种新型的抗混叠滤波光纤水声传感器[J]. 光学学报, 2009, 29(s1): 65. Wang Zefeng, Hu Yongming. New Anti-Aliasing Filtering Underwater Fiber-Optic Acoustic Sensors[J]. Acta Optica Sinica, 2009, 29(s1): 65.

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