【作者】 张鹏程；

【导师】 曹家年；

【作者基本信息】 哈尔滨工程大学 ， 光学工程， 2005， 硕士

【摘要】 随着我国光纤工业的迅速崛起和光纤光栅制造技术的不断完善,利用光纤光栅制作传感器一直是近些年来研究的热点。由于光纤光栅传感器具有低频,宽带,高灵敏度等突出优势,为满足海军水中武器和设备战技性能方面不断提高的要求,将光纤光栅应用于水声探测将有着重要意义。本课题设计正是在这样的背景下开展研究工作的。 论文详细论述了光纤光栅的传感机理,比较了目前已经提出的各种光纤光栅传感解调方案的优缺点,结合对光纤光栅传感原理的理论分析,确定了利用M-Z干涉仪检测光栅反射波长移动的方案,深入研究了稳定干涉仪工作点相位的原理,用主动相位反馈的方法克服了相位诱导信号衰落,并给出了仿真结果,证明了方案的可行性。 论文最后利用新型器件——光环行器,设计了一种带法拉第旋转镜的迈克耳逊干涉仪干涉解调法,同时克服了干涉仪工作点相位漂移和干涉光偏振态随机变化导致的信号衰落,并改善了干涉仪输出信号的信噪比,探索性的提出了一种基于干涉解调法的时分复用光纤光栅传感阵列。以上干涉法检测方案的提出,在光纤光栅水听器这一领域具有一定的创新意义,使得利用光纤干涉仪来解调光纤光栅波长编码更好地走向了实用化。更多还原

【Abstract】 Along with fiber optic industry rising promptly in our country and with the improving of technology in production, fiber optic grating(FBG) had become one of the most successful optic passive device. The FBG sensor has a series of prominent superiority , and it meets the advancing of performance arm and equipment working in water of navy. So it is very important to use FBG in detecting the sound signal in water. This work begins under such background.FBG sensing mechanism is presented exhaustively, the advantage and disadvantage of a few demodulation scheme in common use is introduced. Based on the analyzing of sensing mechanism, we make deep research on how to stabilize the work point phase of the M-Z fiber optic interferometric in order to detect the echo wavelength shift of the FBG. Therefore, the scheme is brought forward and the simulating is completed on computer, it is proved that the scheme is correct.At last, we design a scheme to demodulate the wavelength modulation by using optical circulator and Michelson interferometric with Faraday rotator mirror. The signal fading induced by random fluctuations in the states of olarization (SOPs) of the interferometric beam and random excursion of the work point of interferometric is overcome, and the SNR of signal is improved. Based on it, we probe to put forward a time-devision multiplexing FBG sensor array. The detecting scheme by using interferometric we brought forward posses innovate significance in domestic fiber optic hydrophone research area at present, and it have more practical value.更多还原