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提出了一种基于薄壁圆柱壳体的压力温度同时区分测量的光纤Bragg光栅(FBG)传感器结构。将双FBG沿着轴向分别粘贴在壁厚度不均匀的柱体外表面,由于两个FBG受到温度影响而引起的波长漂移量是相同的,这时两光栅Bragg波长漂移量之差就完全取决于压力,从而实现对压力温度的区分测量。实验测得,在0～7MPa内传感器的压力响应灵敏度为0.073nm/MPa,在22.6～112.6℃内的温度灵敏度为0.037nm/℃,分别是裸FBG的24倍和3.7倍。结果也表明,这种传感器具有良好的线性度与可重复性。
A fiber Bragg grating (FBG) sensor structure based on the pressure and temperature measurement of thin-walled cylindrical shell was proposed. The double FBG along the axial direction were attached to the uneven thickness of the cylinder wall surface, due to the two FBG temperature drift caused by the wavelength of the same amount of drift, then the two grating Bragg wavelength drift depends entirely on the difference between Pressure, in order to achieve the differential pressure temperature measurement. The experimental results show that the pressure response sensitivity of the sensor at 0 ~ 7MPa is 0.073nm / MPa and the temperature sensitivity at 22.6 ~ 112.6 ℃ is 0.037nm / ℃, which is 24 times and 3.7 times that of the bare FBG respectively. The results also show that this sensor has good linearity and repeatability.