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传统宽带光源光纤光栅(FBG)传感系统的解调部分比较复杂,为了克服这一缺点,使用线性扫频激光器作为FBG传感系统的光源,并选定一个光栅作为参考光栅,将其他光栅作为传感光栅。根据传感光栅与参考光栅的反射信号时间间隔的变化,解调得到FBG反射中心波长的变化,解调过程非常简便。基于FBG传感系统进行了温度和光纤轴向拉力的测量实验,验证了该系统的可行性和正确性,也证明了该系统可单独或同时测量温度和光纤轴向拉力。给出了提高系统测量精度的途径,包括保证参考光栅的温度稳定以及使用扫频速率较小的扫频光源和采样速率较高的示波器。
In order to overcome this shortcomings, the demodulation part of FBG sensing system is more complicated. The linear sweep laser is used as the light source of FBG sensing system. One grating is selected as the reference grating and the other is used as Sensing grating. According to the change of the reflection signal interval between the sensing grating and the reference grating, the wavelength of the FBG reflection center is demodulated to be demodulated, and the demodulation process is very simple. Based on the FBG sensing system, the measurement experiment of temperature and axial tension of fiber was carried out. The feasibility and correctness of the system were verified. It was also proved that the system can measure the temperature and axial tension of the fiber separately or simultaneously. The ways to improve the measurement accuracy of the system are given, including ensuring the temperature stability of the reference raster, using the sweep source with low sweep rate and the oscilloscope with higher sampling rate.