激光技术
激光技術
격광기술
LASER TECHNOLOGY
2015年
1期
1-5
,共5页
李栋%周金海%瞿柯林%祝艳宏%金晓峰
李棟%週金海%瞿柯林%祝豔宏%金曉峰
리동%주금해%구가림%축염굉%금효봉
光纤光学%光纤水听器%水声测量%抗波浪解调%π/2相位解调法
光纖光學%光纖水聽器%水聲測量%抗波浪解調%π/2相位解調法
광섬광학%광섬수은기%수성측량%항파랑해조%π/2상위해조법
fiber optics%fiber optic hydrophone%underwater acoustic measurement%anti-wave demodulation%π/2 phase demodulation method
为了减弱基于水面声光耦合的光纤水听器水面波动对解调信号造成的幅度衰落,采用了利用检测信号臂光强度信息补偿解调信号幅度的方法。从理论上推导了该方法修正解调信号的过程,并对该过程进行了数值仿真,同时实际搭建光纤水听器探测系统,利用π/2相位解调法对水面恒定振动信号进行了实验验证。结果表明,相比原始解调信号,修正后的信号幅度基本稳定,幅度值整体提高5dB,解调信号失真度减小,相位噪声得到抑制,信噪比得到提高,可辨认信号时间长度扩展为原来的3.5倍。该方案能有效克服由水面波动引起的解调信号衰落现象,信号质量得到优化,系统抗波浪解调能力得到提高。
為瞭減弱基于水麵聲光耦閤的光纖水聽器水麵波動對解調信號造成的幅度衰落,採用瞭利用檢測信號臂光彊度信息補償解調信號幅度的方法。從理論上推導瞭該方法脩正解調信號的過程,併對該過程進行瞭數值倣真,同時實際搭建光纖水聽器探測繫統,利用π/2相位解調法對水麵恆定振動信號進行瞭實驗驗證。結果錶明,相比原始解調信號,脩正後的信號幅度基本穩定,幅度值整體提高5dB,解調信號失真度減小,相位譟聲得到抑製,信譟比得到提高,可辨認信號時間長度擴展為原來的3.5倍。該方案能有效剋服由水麵波動引起的解調信號衰落現象,信號質量得到優化,繫統抗波浪解調能力得到提高。
위료감약기우수면성광우합적광섬수은기수면파동대해조신호조성적폭도쇠락,채용료이용검측신호비광강도신식보상해조신호폭도적방법。종이론상추도료해방법수정해조신호적과정,병대해과정진행료수치방진,동시실제탑건광섬수은기탐측계통,이용π/2상위해조법대수면항정진동신호진행료실험험증。결과표명,상비원시해조신호,수정후적신호폭도기본은정,폭도치정체제고5dB,해조신호실진도감소,상위조성득도억제,신조비득도제고,가변인신호시간장도확전위원래적3.5배。해방안능유효극복유수면파동인기적해조신호쇠락현상,신호질량득도우화,계통항파랑해조능력득도제고。
A novel method was put forward to weaken the signal fading phenomenon of an acousto-optic coupling fiber optic hydrophone on the water surface when the water fluctuates.The method compensated the signal amplitude by detecting the light intensity of the signal arm.The amendment process of demodulation signal was analysed in theory and bynumerical simulation.A fiber optic hydrophone system based on π/2 phase demodulation technique was constructed to test the water constant vibration signal.The results show that, compared with the original demodulation signal, the amplitude of the amended signal is stabilized and increased by 5dB wholly.The distortion degree is reduced, the phase noise is suppressed, the signal to noise ratio is improved and the time range of the identifiable signal is extended to 3.5 times.This method can overcome the signal fading phenomenon caused by surface fluctuation effectively, optimize the signal quality and enhance the ability of anti-wave demodulation for the system.