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为实现光纤光栅加速度测量,提出了一种基于弹性管的两点式封装光纤布拉格光栅(FBG)加速度传感器。首先理论分析了其传感原理,并建立了其响应灵敏度的解析表达式,通过引入加速度理想灵敏度的概念,讨论了此类型加速度灵敏度的频率响应;其次,基于该模型设计了FBG加速度计,实验研究了加速度的幅频响应特性、谐振频率和加速度的线性响应。结果表明:在小于共振频率的低频段具有较好的平坦区,加速度与波长具有较好的线性关系,线性度为99.8%,加速度响应灵敏度为63.0pm/G。实验值与理论值的相对误差为0.98%,实验与理论吻合的较好。
In order to realize the acceleration measurement of FBG, a two-point fiber Bragg grating (FBG) accelerometer based on elastic tube was proposed. Firstly, the sensing principle is analyzed theoretically and the analytical expression of its response sensitivity is established. By introducing the concept of ideal sensitivity of acceleration, the frequency response of this type of acceleration sensitivity is discussed. Secondly, an FBG accelerometer is designed based on the model. The amplitude-frequency response of the acceleration, the linear response of the resonance frequency and the acceleration are studied. The results show that there is a good linear relationship between the acceleration and the wavelength in the low frequency range of less than the resonance frequency. The linearity is 99.8% and the acceleration response sensitivity is 63.0pm / G. The relative error between the experimental value and the theoretical value is 0.98%, which is in good agreement with the experiment.