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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。
Fiber grating is the physical parameters of the external fiber Bragg wavelength modulation to obtain the sensing information, is a wavelength-modulated fiber optic sensor. The application fields of modern optical fiber sensing systems require optical fiber sensors to be used in a variety of extremely harsh and complex environments and to achieve high-precision and high-sensitivity detection in harsh environments. There are many methods available for wavelength detection of fiber gratings, but the accuracy of these methods is limited by different optical noise. If the fiber grating detection system uses a laser source light source, the signal power can be greatly enhanced, but the extra reflection will produce harmful interference signals, limiting the grating wavelength demodulation accuracy. The paper uses the theory of simulation and experimental verification of wavelet analysis for the harsh environment of optical fiber sensor signal denoising. Simulation and experimental results show that the wavelet analysis and processing method can effectively reduce the system detection error, improve the measurement accuracy and system SNR, and meet the performance requirements of optical fiber sensing detection in harsh environments.