Li Tianliang, Tan Yuegang, Han Xue, Zheng Kai, Zhou Zude
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China.
Sensors (Basel). 2017 Jan 23;17(1):218. doi: 10.3390/s17010218.
A novel fiber Bragg grating (FBG) sensing-based acceleration sensor has been proposed to simultaneously decouple and measure temperature and acceleration in real-time. This design applied a diaphragm structure and utilized the axial property of a tightly suspended optical fiber, enabling improvement in its sensitivity and resonant frequency and achieve a low cross-sensitivity. The theoretical vibrational model of the sensor has been built, and its design parameters and sensing properties have been analyzed through the numerical analysis. A decoupling method has been presented with consideration of the thermal expansion of the sensor structure to realize temperature compensation. Experimental results show that the temperature sensitivity is 8.66 pm/°C within the range of 30-90 °C. The acceleration sensitivity is 20.189 pm/g with a linearity of 0.764% within the range of 565 m/s². The corresponding working bandwidth is 10200 Hz and its resonant frequency is 600 Hz. This sensor possesses an excellent impact resistance for the cross direction, and the cross-axis sensitivity is below 3.31%. This implementation can avoid the FBG-pasting procedure and overcome its associated shortcomings. The performance of the proposed acceleration sensor can be easily adjusted by modifying their corresponding physical parameters to satisfy requirements from different vibration measurements.
一种基于新型光纤布拉格光栅（FBG）传感的加速度传感器被提出来，用于实时同时解耦和测量温度与加速度。该设计采用了膜片结构，并利用紧密悬置光纤的轴向特性，从而提高其灵敏度和谐振频率，并实现低交叉灵敏度。建立了该传感器的理论振动模型，并通过数值分析对其设计参数和传感特性进行了分析。提出了一种考虑传感器结构热膨胀的解耦方法，以实现温度补偿。实验结果表明，在30 - 90°C范围内，温度灵敏度为8.66 pm/°C。在565 m/s²范围内，加速度灵敏度为20.189 pm/g，线性度为0.764%。相应的工作带宽为10200 Hz，谐振频率为600 Hz。该传感器在横向具有出色的抗冲击性，横向轴灵敏度低于3.31%。这种实现方式可以避免FBG粘贴过程并克服其相关缺点。通过修改相应的物理参数，可以轻松调整所提出的加速度传感器的性能，以满足不同振动测量的要求。
