光电技术应用, 2016, 31 (2): 27, 网络出版: 2016-06-12  

水下声场激光相干探测的特征提取与分析

Feature Extraction and Analysis of Underwater Acoustic Source with Laser Interferometry
作者单位
烟台大学 光电信息科学技术学院, 山东 烟台 264005
摘要
激光相干探测法从水表面获取水下声场的信息, 通过水表面反射光与参考光的干涉, 从干涉信号中提取水下振动的频率。采用频谱分析与傅里叶滤波变换的特征提取方法, 可有效地增强信号里水下声场的振动特征。振源在水下35 cm处, 分别以1 000 Hz、2 000 Hz和3 200 Hz振动, 激光相干探测从水面实时获取信息。通过对实验数据的分析表明, 激光相干探测可以有效地获取水下声场振动的信息, 傅里叶变换滤波方法能有效地增强目标的特征。
Abstract
The information of the underwater acoustic field is obtained from the water surface by the laser coherent detection method. The frequency of the underwater vibration is extracted from the interference signal by the interference between the reflected light and the reference light on the water surface. The vibration features of the underwater acoustic field in the signal can be effectively enhanced by the method of spectrum analysis and fast Fourier transform (FFT) filter feature extraction method. Laser coherent detection gets the information from the water surface in real time under the condition that the vibration source is located underwater 35 cm, respectively with 1 000 Hz, 2 000 Hz and 3 200 Hz vibration. Through experimental data analysis, the results show that the laser coherent detection can effectively obtain the vibration information of underwater acoustic field, and FFT filter method can effectively enhance the features of the target.

赵龙, 张骏, 杨海梅, 王庆娥. 水下声场激光相干探测的特征提取与分析[J]. 光电技术应用, 2016, 31(2): 27. ZHAO Long, ZHANG Jun, YANG Hai-mei, WANG Qing-e. Feature Extraction and Analysis of Underwater Acoustic Source with Laser Interferometry[J]. Electro-Optic Technology Application, 2016, 31(2): 27.

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