摘要
分布反馈式光纤激光水听器系统中迈克尔逊干涉仪容易受外界环境温度波动影响,产生热噪声,造成解调失真。推导温度波动经激光器转化为频率噪声的理论过程,分析频率噪声与温度的关系。搭建实验测试系统,采用振动液柱法进行实验,对水听器施加800 Hz,5 V的水声振动信号,温度由室温20℃升至60℃,系统可以正常解调出水声信号;不施加水声信号,温度上升过程中每隔10℃采数,经处理在3~10 kHz频带范围内,室温20℃条件下系统的相位噪声约为-90 dB,60℃条件下相位噪声约为-70 dB,温度升高40℃导致系统相位噪声提高约20 dB。本文实验结果对后续降低系统的噪声水平具有重要意义。
The Michelson interferometer in the distributed feedback type(DFB) fiber laser hydrophone system is susceptible to temperature fluctuations in the external environment, resulting in thermal noise and demodulation distortion. The theoretical process of converting temperature fluctuations into frequency noise by laser is deduced, and the relationship between frequency noise and temperature is analyzed. Set up an experimental test system, use the vibrating liquid column method to conduct experiments, apply a 800 Hz, 5 V underwater acoustic vibration signal to the hydrophone, and the temperature rises from 20°C to 60°C at room temperature, and the system can demodulate the underwater acoustic signal normally;no underwater acoustic signal is applied. The signal is collected every 10°C during the temperature rise and processed in the frequency range of 3~10 kHz. The phase noise of the system is about –90 dB at room temperature of 20°C, and the phase noise is about –70 dB at 60°C. The temperature rises A high of 40°C leads to an increase in system phase noise of about 20dB. The experimental results are of great significance to the subsequent reduction of the noise level of the system.
作者
赵宏琳
黄俊斌
顾宏灿
汪云云
宋文章
周璇
ZHAO Honglin;HUANG Junbin;GU Hongcan;WANG Yunyun;SONG Wenzhang;ZHOU Xuan(Naval University of Engineering,Ordnance Engineering College,Wuhan 430033,China;No.91388 Unit ofPLA,Zhanjiang 524002,China)
出处
《舰船科学技术》
北大核心
2022年第16期122-125,共4页
Ship Science and Technology
基金
国家自然科学基金资助项目(11774432)。
关键词
DFB光纤激光水听器
迈克尔逊干涉仪
温度
相位噪声
频率噪声
distributed feedback fiber grating laser hydrophone
michelson interferometer
temperature
phase noise
frequency noise
