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分析并提出了基于重构等效啾啁(REC)技术激光器阵列的传感系统和解调算法。REC工艺满足激光器阵列的低成本大量生产,并具备小体积的优势,在未来传感领域中有较大的实用价值。提出了一种激光器扫描的高效算法用来测量光纤布拉格光栅(FBG)因外界应力而产生的位移量。系统的独特性在于阵列激光器通道仅需调谐0.4 nm采样数据,取代了扫描FBG主功率峰,并且算法在FBG的任意谱段均适用,可以用于多通道波峰复用的FBG传感网络中。在单通道和四通道的实验中对FBG反射谱的位移进行精确定位,初步实验证明了该系统和算法的有效性和可行性。算法得出单通道中心波长与实际中心波长误差均在5 pm以下,四通道可以到达在2 pm以下,应力与算法结果中心波长呈现很好的线性度。对今后多通道激光阵列传感具有一定参考价值。
The sensing system and demodulation algorithm based on reconstructed Equivalent Chirp (REC) laser array are analyzed and proposed. The REC process meets the low cost mass production of laser arrays and has the advantage of small size, which has great practical value in the future sensing field. An efficient laser scanning algorithm is proposed to measure the displacement caused by external stress on Fiber Bragg Gratings (FBGs). The uniqueness of the system is that the array laser channel only needs to tune 0.4 nm sampling data instead of scanning the main power peak of the FBG. The algorithm is applicable in any spectrum of the FBG and can be used in the multi-channel wave-multiplexing FBG sensing network. The displacement of the FBG is precisely located in single-channel and quad-channel experiments. The preliminary experiments show the effectiveness and feasibility of the proposed system and algorithm. The algorithm shows that the single-channel center wavelength and the actual center wavelength error are below 5 pm, the four channels can reach below 2 pm, and the stress and the algorithm center wavelength exhibit good linearity. It is of certain reference value to multi-channel laser array sensing in the future.