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为实现可变体机翼翼表温度的高精度的实时检测,设计了一种基于长周期光纤光栅(LPG)的温度测试系统。该系统采用长周期光纤光栅作为温度传感元件,高双折射光纤环镜作为边缘滤波器件。在边缘滤波理论研究的基础上,提出了一种降噪增敏的算法。实验中将LPG粘贴在可变体机翼翼表材料的表面,当外界温度发生变化时,LPG的谐振波长发生偏移,经光纤环镜的调制后出射光强发生变化。实验结果表明,长周期光纤光栅温度灵敏度为0.053nm/℃,系统线性度为0.9997,温度分辨率为0.05℃,该系统具有较高的温度灵敏度和分辨率,能够较好地实现可变体机翼翼表温度实时检测。
In order to achieve high-precision real-time detection of variable wing temperature, a temperature measurement system based on long period fiber grating (LPG) was designed. The system uses a long-period fiber grating as a temperature sensing element and a high-birefringence fiber ring mirror as an edge filter. Based on the research of edge filtering theory, a noise reduction and sensitization algorithm is proposed. In experiment, the LPG is pasted on the surface of the variant wing wing material. When the outside temperature changes, the resonance wavelength of the LPG shifts, and the light intensity changes after being modulated by the fiber ring mirror. The experimental results show that the temperature sensitivity of long-period fiber gratings is 0.053nm / ℃, the linearity is 0.9997 and the temperature resolution is 0.05 ℃. The system has high temperature sensitivity and resolution, and can realize variable body machine Wing wing temperature real-time detection.