摘要
针对光纤光栅声传感系统反正切解调算法中采样率与声场幅度相关这一现象,计算分析了正弦声信号、高斯脉冲声信号在3种不同反正切算法下幅度与采样率的关系,用脉冲声信号进行了实验验证,并从相位展开方式的判据出发予以机理解释,以期望在应用前可根据声场、传感器灵敏度等选择恰当的采样率。数值计算和实验结果表明,这3种方式需要的采样率均与信号幅度呈线性关系,分别需要一个声周期内采样点数为信号幅度的8倍、4倍和2倍。此外,还将3种方式与微分-交叉相乘算法在软件计算时的实时性和计算精度进行了比较,在满足采样率要求时三者均较微分-交叉相乘算法的表现更佳。
Aiming at the phenomenon that the sampling rate is related to the amplitude of soundfield when using an arctangent algorithm,the quantitative relationship between the sampling rate and the signal amplitude is studied by calculating and analyzing situations of sinusoidal signal and Gaussian pulse signal under three different algorithms,which helps select an appropriate sampling rate according to soundfield and sensor sensitivity before application.Simulation and experimental results indicate that there exist linear relationships between sampling rates and signal amplitude under three algorithms,that sampling points per wavelength need to be 8,4 and 2 times of signal amplitude,respectively.In addition,compared with differential cross-multiplying(DCM)algorithm,arctangent algorithms all perform better on real time and accuracy when satisfying sampling rate requirements.
作者
安秉文
吴先梅
张金英
AN Bingwen;WU Xianmei;ZHANG Jinying(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Optics and Photonics,Bejjing Institute of Technology,Beijing 100081,China)
出处
《应用声学》
CSCD
北大核心
2023年第6期1129-1138,共10页
Journal of Applied Acoustics
基金
国家自然科学基金项目(11674351)。
关键词
光纤声传感
反正切解调
3×3耦合器
Fiber-optic acoustic sensing
Arctangent demodulation
3×3 coupler
