光纤光栅温度传感器中应变与温度交叉敏感问题研究

发布时间：2018-04-27 04:33

  本文选题：锥形光纤光栅 + 传输矩阵法　； 参考：《南京邮电大学》2017年硕士论文

【摘要】：光纤光栅传感器以其传感单元体积小、感应灵敏度高、不受电磁波干扰、易于多点监测等特点,在诸多传感领域得到广泛应用,为人们带来巨大的经济效益和更为安全便捷的生活方式。而锥形光纤Bragg光栅所具有的特性可以很好的解决温度与应力交叉敏感问题。本文通过建立数学模型,结合传输矩阵法,首先仿真研究线性锥面的锥形光纤Bragg光栅的轴向应变与温度的传感特性。接着提出一种具有抛物线性锥面的非线性锥形光纤Bragg光栅,并且采用相同的光纤光栅参数,将这两种光栅进行对比研究。结果表明,两种锥形光纤光栅的反射带宽只依赖于应力大小而与温度无关,其中线性锥形光栅反射带宽及中心波长均与应力大小成线性关系,而抛物线型的反射带宽与应力大小成非线性关系,但两者的温度传感特性一致,说明改变光纤外部结构形状并不影响温度灵敏度。最后,本文利用电弧放电技术制作锥形光纤光栅,研究其轴向应力和温度传感特性,应变灵敏度和温度灵敏度分别为0.9468)/和0.0118nm/℃。光谱特性表明,在光栅反射谱峰中有透射峰出现,透射峰中心波长与反射谱两侧边缘的距离大小不受温度的影响,但随着轴向应力增大,透射峰中心波长逐渐向反射谱长波方向移动。
[Abstract]:Fiber Bragg grating sensor has been widely used in many sensing fields because of its small size, high sensitivity, no interference by electromagnetic wave, easy multi-point monitoring and so on. For people to bring great economic benefits and a more safe and convenient way of life. The characteristics of tapered fiber Bragg gratings can solve the cross-sensitivity problem of temperature and stress. Based on the mathematical model and the transfer matrix method, the sensing characteristics of the axial strain and temperature of the conical fiber Bragg grating with linear conical surface are studied by simulation in this paper. Then a nonlinear tapered fiber Bragg grating with parabolic conical surface is proposed, and the two gratings are compared with each other with the same fiber grating parameters. The results show that the reflectance bandwidth of the two kinds of tapered fiber gratings is only dependent on the stress and is independent of the temperature. The reflection bandwidth and the center wavelength of the linear tapered gratings are linearly related to the magnitude of the stress. The parabolic reflectance bandwidth is nonlinear to the stress, but the temperature sensing characteristics of the two are consistent, indicating that the temperature sensitivity is not affected by changing the shape of the external structure of the fiber. Finally, the tapered fiber grating is fabricated by arc discharge technique. The axial stress and temperature sensing characteristics of the grating are studied. The strain sensitivity and temperature sensitivity are 0.9468 / and 0.0118nm/ 鈩，

本文编号：1809215