在实际应用中,光纤光栅传感器的测量精度受到噪声、成本等因素的制约.为了实现低成本的高精度光纤光栅传感器系统,提出了对光纤光栅反射谱采用自适应阈值小波消噪和B样条拟合算法的处理技术,并通过实验和仿真得出自适应阈值小波消噪,有效提高了系统的信噪比,在相同采样精度下拟合处理前波长检测的误差为0.01 nm,处理后为0.0017 nn,误差降低了一个数量级.实验结果证明该方法不但可以有效降低噪声带来的读取误差,而且提高了测量Bragg波长漂移量的分辨率,从而实现高精度测量温度、应变等外界参量.
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