1 西南石油大学机电工程学院石油天然气装备教育部重点实验室，四川 成都 610500
2 成都工业学院智能制造学院，四川 成都 611730
针对载波外调制过程中引入的调制深度偏移以及载波相位延迟等因素对光纤地震计解调结果的影响，提出一种多级正交信号融合计算方法，综合考虑三级倍频载波以及三级贝塞尔函数对解调效果的影响，并在此基础上计算载波相位延迟和相位调制深度C，实现对解调结果的误差补偿。实验结果表明：多级正交信号融合计算方法改善了表征解调结果非线性失真程度的总谐波失真，解调结果改善后总谐波失真达到-90 dB，同时解调结果信纳比达到84 dB，综合二者可看出所提算法对相位延迟和调制深度C具有强鲁棒性；所提算法解调结果可达到的本底噪声水平；所提算法解调结果相位延迟稳定在0°左右，与其他算法的结果相比，所提多级正交信号融合计算方法对于信号解调具有更好的实时性。
光纤光学 光纤振动传感 相位生成载波 相位解调 相位延迟 调制深度 光学学报
2023, 43(22): 2206005
Author Affiliations
Abstract
Faculty of Mechanical and Electronic Engineering, Southwest Petroleum University, Key Laboratory of Petroleum-Gas Equipment, Ministry of Education of China, Chengdu 610500
A novel three-component hybrid-integrated optical accelerometer based on LiNbO3 photoelastic waveguide is presented. The photoelasitcity of LiNbO3 due to three-dimensional stress states is obtained analytically. We analyze the level of sensitivity to cross-axis accelerations which is a very important parameter for three-component accelerometer. Theoretically, the designed three-component hybrid-integrated optical accelerometer has a transverse sensitivity ratio (TSR) of zero. The sensor has a high natural frequency of 3.5 kHz and a linear broad working frequency.
三分量加速度传感器 光弹效应 横向灵敏度比 LiNbO3波导 130.6010 Sensors 280.4788 Optical sensing and sensors Chinese Optics Letters
2009, 7(1): 0132
