基于光学微环谐振器的低频水下声压测量方法  

Spectral characteristics of low frequency underwater acoustic signal based on optical micro-ring resonator

作　　者：郭书生 李锋[1] GUO Shusheng;LI Feng(School of Electronics and Information,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学电子信息学院,镇江212003

出　　处：《江苏科技大学学报（自然科学版）》2018年第1期88-92,共5页Journal of Jiangsu University of Science and Technology:Natural Science Edition

摘　　要：为满足低频水下声信号测量微型化、高灵敏和低成本的需求,采用有效折射率法、耦合模理论和时域有限差分方法,设计一种带有单微环谐振器的声压传感结构.低频水声信号向远处传播时产生声压,引起微环谐振器有效折射率变化,通过检测传感器输出端谐振波长的漂移,实现对水声信号的检测.仿真得到声压传感器的灵敏度和探测极限,并分析输出端口的光谱特性.理论分析表明:微环谐振声压传感结构在受到低频水下声压作用时,在0~1 500μPa范围内,每当受到1μPa的声压,谐振波长漂移0.012 nm,最小可测量到10^(-5)nm的有效谐振波长漂移.该结构为制备高灵敏度高集成水听器设备提供理论参考.In order to suffice the demands of measuring low frequency underwater acoustic signalbased on miniaturization,sensitivity and low cost,effective index method,coupled mode theory and the finite difference time domain methodare used to design a pressure sensor structure with single micro ring resonator.Due to the sound pressure of the low frequency underwater acoustic signal,the effective refractive index of the micro ring resonator is changed.By detecting the resonant wavelength shift of sensor outputs,the parameters of underwater acoustic signals are obtained.The sensitivity and detection limit of pressure sensor have also been obtained.In the end,the paper analyzed the spectral characteristics of the output port.Theoretical analysis shows that the resonant wavelength of micro-ring sound pressure sensor changeswith the change of the low frequency underwater sound pressure.In the range of 0～1 500μPa,when the sound pressure changesby 1μPa,the resonant wavelength will changes by 0.012 nm.The sensitivity of the sensor can reach up to 10-5 nm.It provides theoretical reference for the preparation of integrated high sensitivity hydrophone equipment.

关 键 词：水声信号 微环谐振器 声压 传感器 谐振波长 

分 类 号：TN252[电子电信—物理电子学]