论文部分内容阅读
提出了一种采用乙烯-醋酸乙烯共聚物(EVA)封装增敏的光纤光栅径向压力传感方案,将光纤光栅用EVA材料和方钢封装成半哑铃型传感单元,利用有限元软件对结构体受力分布进行了仿真,理论分析了传感单元在径向压力作用下的响应特性,并建立实验系统对光纤光栅径向压力传感特性进行验证。研究结果表明:当径向压力在0~0.3 N范围内时,封装后的光纤光栅对径向压力响应具有很好的线性度;对径向压力的灵敏度相对于裸光栅提高了100.74倍,经匹配法解调后,系统的灵敏度最高可以达到0.94 nm/N;对于解决微小径向应变精确测量的实际工程需求具有重要的参考意义。
A radial pressure sensing scheme of fiber gratings using ethylene-vinyl acetate copolymer (EVA) encapsulation was proposed. The fiber grating was encapsulated with EVA material and square steel into semi-dumbbell-type sensing units. The finite element software The force distribution of the structure is simulated. The response characteristics of the sensing unit under the radial pressure are analyzed theoretically. The experimental system is established to verify the radial pressure sensing characteristics of the fiber gratings. The results show that when the radial pressure is within the range of 0 ~ 0.3 N, the encapsulated FBG has a good linearity to the radial pressure response; the sensitivity to radial pressure is increased by 100.74 times compared with the bare grating, Matching method demodulation, the system sensitivity up to 0.94 nm / N; for the precise measurement of small radial strain of the actual engineering needs of an important reference value.