基于DSP的光纤光栅应变传感器信号检测实验研究

Signal Detection of Fiber Bragg Grating Strain Sensor Based on DSP

针对光纤光栅应变传感器接收信号弱且信噪比低这一问题,提出了应用DSP技术来抑制噪声,提高Bragg峰值波长检测精度的方法。实验结果表明所设计的498阶Kaiser窗低通FIR数字滤波器能够显著提高光纤光栅应变传感器的信号检测精度。采用DSP技术可以较好地解决光纤光栅传感器的波长解调这一技术难题。

The fiber Bragg grating strain sensor has some disadvantages such as poor received signal intensity and the low signal-to-noise ratio. The method that can improve the detection precision of the Bragg peak wavelength is presented. The noise suppression technolgy based on DSP is applied. The experiment results show that the FIR PLF which is based on Kaiser window improves the fiber Bragg grating strain sensor＇s measure precision, and the DSP technology can resolve the problem of wavelength demodulation of the FBG.