Yao Kun, Lin Qijing, Jiang Zhuangde, Zhao Na, Tian Bian, Shi Peng, Peng Gang-Ding
State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Collaborative Innovation Center of High-End Manufacturing Equipment, Xi'an Jiaotong University, Xi'an 710054, China.
Sensors (Basel). 2018 Mar 1;18(3):743. doi: 10.3390/s18030743.
A combined stress-vibration sensor was developed to measure stress and vibration simultaneously based on fiber Bragg grating (FBG) technology. The sensor is composed of two FBGs and a stainless steel plate with a special design. The two FBGs sense vibration and stress and the sensor can realize temperature compensation by itself. The stainless steel plate can significantly increase sensitivity of vibration measurement. Theoretical analysis and Finite Element Method (FEM) were used to analyze the sensor's working mechanism. As demonstrated with analysis, the obtained sensor has working range of 0-6000 Hz for vibration sensing and 0-100 MPa for stress sensing, respectively. The corresponding sensitivity for vibration is 0.46 pm/g and the resulted stress sensitivity is 5.94 pm/MPa, while the nonlinearity error for vibration and stress measurement is 0.77% and 1.02%, respectively. Compared to general FBGs, the vibration sensitivity of this sensor is 26.2 times higher. Therefore, the developed sensor can be used to concurrently detect vibration and stress. As this sensor has height of 1 mm and weight of 1.15 g, it is beneficial for minimization and integration.
基于光纤布拉格光栅（FBG）技术，开发了一种组合式应力 - 振动传感器，用于同时测量应力和振动。该传感器由两个FBG和一个经过特殊设计的不锈钢板组成。两个FBG分别感应振动和应力，且该传感器能够自行实现温度补偿。不锈钢板可显著提高振动测量的灵敏度。采用理论分析和有限元方法（FEM）对传感器的工作机制进行了分析。分析表明，所制备的传感器振动传感工作范围为0 - 6000 Hz，应力传感工作范围为0 - 100 MPa。相应的振动灵敏度为0.46 pm/g，应力灵敏度为5.94 pm/MPa，而振动和应力测量的非线性误差分别为0.77%和1.02%。与普通FBG相比，该传感器的振动灵敏度高出26.2倍。因此，所开发的传感器可用于同时检测振动和应力。由于该传感器高度为1 mm，重量为1.15 g，有利于实现小型化和集成化。
