为了提高光纤光栅传感系统的容量和解调精度，研究了多通道光纤光栅传感系统的相关解调技术，提出了一种应用于多通道光纤布拉格光栅(FBG)传感系统解调的算法。结合仿真和实验，给出了该算法对光纤光栅反射峰的解调效果，分析了算法的精度。研究发现，整个系统可实现32路光栅复用，能在1525～1585 nm的波长范围内进行解调，算法的解调精度可达2 pm，分辨率为0.1 pm。该算法有效地降低了一般寻峰算法中输入信噪比(SNR)对系统解调精度的影响，系统的测量精度、测量范围、可靠性都得到改善，能够很好地应用于实际工程。

To improve the capability and detection precision of the fiber Bragg sensing system, the novel interrogation technique and a fast wavelength detection algorithm are proposed for the multi-channel fiber Bragg grating (FBG) sensing system. With the combination of the numerical simulation and experiment, it is demonstrated that the average precision of interrogation is 2 pm and the resolution is 0.1 pm over the working range of 1525～1585 nm. The system can realize the real-time monitoring of 32 channels more than 1000 sensors. Present work shows that the algorithm described in this paper can reduce the signal noise ratio (SNR) at the input of the system which influences the precision of interrogation. Compared with traditional wavelength detection algorithms, this interrogation method is greatly improved in measurement precision, wavelength range and working reliability. It can well be applied to practical engineering applications.