啁啾光纤光栅的传感性能及测量方法研究  

Research on sensingproperties and measuring method of chirped fiber Bragg grating

作　　者：南秋明[1,2] 宋蕾[3] 李盛[1,2] 

机构地区：[1]武汉理工大学光纤传感技术国家工程实验室,武汉430074 [2]武汉理工大学光纤传感技术与信息处理教育部重点实验室,武汉430074 [3]辽宁科技大学电子与信息工程学院,辽宁鞍山114000

出　　处：《功能材料》2014年第12期12093-12096,共4页Journal of Functional Materials

基　　金：国家自然科学基金重大项目资金资助项目(61290311);中央高校基本科研业务费专项资金资助项目(2014-Ⅳ-090)

摘　　要：介绍了啁啾光纤光栅的物理结构和传感原理,引入参考光栅,采用调制光强的方法实现了啁啾光纤光栅的传感信号解调,测试了它的应变和温度传感性能,测试数据显示其应变和温度传感曲线的线性度分别为0.9991和0.9989,表明啁啾光纤光栅具有较好的线性传感特性。为了解决长期检测时测量结果受光源衰减影响的问题,提出了一种新型的基于光强比值的解调处理算法并进行了实验验证,结果表明,该方法不仅极大地提高了啁啾光纤光栅用于长期检测的测量精度,还具有温度自补偿功能,提高了抗干扰能力,满足长期测试需求。Describes the physical structure and the sensing principle of chirped fiber Bragg grating（CFBG）,introducing a reference grating,the author realizes sensing signal demodulation of CFBG by using light intensity modulation.The strain and temperature sensing properties of CFBG were tested and the test data shows that the linear coefficient of the fitting curves of strain and temperature sensing properties were 0.9991 and 0.9989,which shows that CFBG has eminent strain and temperature sensing properties.In order to solve the problem that measurement accuracy of long-term monitoring was affected by light attenuation,the author proposes a new demodulation algorithm based on the intensity ratio and does some experimental validations for it.Test results showed that the method can greatly improve the long-term detection accuracy of CFBG and also can realize the automatic temperature compensation.

关 键 词：啁啾光纤光栅 光强解调 光源衰减 比值处理算法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]