UV胶封装FBG的横向受力判别研究

Research on Lateral Stress Identification of FBG Encapsulated in UV Adhesive

摘要: 针对横向受力检测需求，提出一种基于UV胶封装的光纤布拉格光栅(Fiber Bragg Grating, FBG)横向受力识别方法。通过设计聚合物封装结构以改善应变传递性能，搭建FBG横向受力实验系统，并利用Java语言开发自动化数据处理程序。该程序基于预设阈值对光功率变化量进行判别，从而实现对FBG受力状态的准确识别。实验结果表明，在5 kg横向载荷作用下，FBG中心波长处的光功率变化量为1.784 dBm，超过1 dBm的判别阈值，系统能够准确输出受力判定结果。该研究为FBG横向受力检测提供了一种有效的实验方法。

Abstract: To address the need for lateral stress detection, this study proposes a method for identifying lateral stress in a fiber Bragg grating (FBG) based on UV adhesive encapsulation. By designing a polymer encapsulation structure to improve strain transfer performance, a lateral stress testing system for the FBG was established, and an automated data processing program was developed using Java. This program identifies changes in optical power based on preset thresholds, thereby enabling accurate identification of the stress state of the FBG. Experimental results show that under a lateral load of 5 kg, the change in optical power at the center wavelength of the FBG is 1.784 dBm, exceeding the detection threshold of 1 dBm, and the system is capable of accurately outputting the stress detection results. This study provides an effective experimental method for FBG lateral stress detection.