摘要
在最近的年里，纤维布拉格栅栏(FBG ) 广泛地为考虑到它超越常规传感器的唯一的优点监视的实际结构的健康在超声的察觉被使用了。尽管 FBG 成功地在超声的检查被测试了， FBG 的敏感上的栅栏长度的效果超声的察觉到系统还有待于被分析。因此用模拟模型，有不同长度栅栏的超声的察觉到系统的敏感上的主要影响因素是首先调查了。在下列实验，有六不同长度 FBG 的察觉到的系统的超声的回答分别地被获得。理论分析和试验性的结果将为察觉到系统的基于 FBG 的超声、声学的排放的敏感改进是有用的。
In recent years, fiber Bragg gratings （FBGs） have been widely used in ultrasonic detection for practical structural health monitoring in light of its unique advantages over the conventional sensors. Although FBGs have been successfully tested in ultrasonic inspection, the effect of the grating length on the sensitivity of the FBG ultrasonic sensing system is yet to be analyzed. Hence, using the simulation model, the main influencing factor on the sensitivity of the ultrasonic sensing system with different lengths gratings was first investigated. In the following experiment, the ultrasonic responses of the sensing system with six different lengths FBGs were obtained, respectively. The theoretical analysis and the experimental results would be useful for sensitivity improvement of the FBG-based ultrasonic and acoustic emission sensing system.
