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在很多高温环境应用中,诸如发动机、飞机和宇航器、复合材料的健康监测,需要精确测量应变。针对这种场合提出了一种基于激光脉冲制作的长周期光纤光栅/法布里-珀罗(LPFG/F-P)温度-应变组合光纤传感器。该传感器由长周期光纤光栅与光纤法布里-珀罗干涉传感器级联构成,其中长周期光纤光栅由高频CO2激光脉冲制作,用于监测温度;光纤法布里-珀罗干涉传感器由157nm准分子激光脉冲制作,用于监测应变。这种新型组合光纤传感器最大的特点是能承受500℃的高温并能在高温环境下实现应变的精确测量,可望在高温恶劣环境条件下的结构(如飞机发动机)健康监测、复合材料生产过程监测等应用中发挥重要作用。
In many high temperature applications, such as engine, aircraft and spacecraft, the health monitoring of composite materials requires accurate measurement of strain. Aiming at this situation, a long period fiber grating / Fabry-Perot (LPFG / F-P) temperature-strain combined optical fiber sensor based on laser pulse fabrication was proposed. The sensor consists of a long-period fiber grating and a fiber Fabry-Perot interference sensor cascade structure, in which the long period fiber grating by high-frequency CO2 laser pulse production, for monitoring temperature; fiber Fabry-Perot interference sensor from 157nm Excimer laser pulse production for monitoring strain. The most prominent feature of this new combined fiber optic sensor is the ability to withstand high temperatures of 500 ° C and accurate strain measurements at high temperatures, structures that are expected to be exposed to harsh environmental conditions (such as aircraft engines), composite monitoring Monitoring and other applications play an important role.