小波分析在恶劣环境光纤传感中的应用(英文)

光纤光栅是通过外界物理参量对光纤布拉格波长的调制来获取传感信息的,是一种波长调制型光纤传感器。现代光纤传感系统的应用领域要求光纤传感器能适用于各种极端恶劣复杂环境,并在恶劣环境中实现高精度高灵敏度的检测。现有很多方法可用于光纤光栅的波长检测,但这些方法的精度都受限于不同的光噪声。如果光纤光栅检测系统的光源采用激光光源,信号功率可大大增强,但多余反射会产生有害干扰信号,限制光栅的波长解调精度。论文采用理论仿真和实验验证的方式将小波分析用于恶劣环境中的光纤传感信号的去噪。仿真和实验结果表明,小波分析处理方法可有效降低系统检测误差,提高测量精度和系统信噪比,满足恶劣环境中光纤传感检测的性能要求。

Wavelet application under rugged environment of fiber sensor

The fiber grating sensor system,based on the FBG,can realize the sensor process by modulating the center wavelength through changing outside physical parameters.The modern application field of fiber sensor system should meet requirements of different rugged environments,and should work in high precision,high sensitivity test.There are many methods for fiber gratings wavelength test,but the precisions of all the methods are limited by the different optical noises.If the tunable laser is used as the source,the signal power can be higher,but the redundant reflection can make the damageable interference signal,which may limit the wavelength demodulating precision of the grating.The wavelet analysis is used in the theory simulation and experiment to remove the noise from the fiber sensor signal.The results show that the wavelet analysis method can decrease the error of the system test effectively and improve the test precision and the system SNR,which can meet the requirements of FBG sensor in rugged environments.