一种新颖的温度压强同时区分测量的光纤Bragg光栅传感器  

A Novel In-fiber Bragg Grating Sensor for Temperature and Pressure Simultaneous Measurement

作　　者：傅海威[1] 乔学光[1] 贾振安[1] 王宏亮[1] 赵大壮[1] 傅君眉[2] 

机构地区：[1]西安石油大学理学院光纤传感实验室,西安710065 [2]西安交通大学电信学院微波与光通信研究所,西安710049

出　　处：《仪器仪表学报》2005年第11期1149-1154,共6页Chinese Journal of Scientific Instrument

基　　金：国家高技术研究发展计划(2002AA313150);国家自然科学基金(69877025);国家教育部科学技术重点项目(02190);陕西省自然科学基金(2000C34);陕西省教育厅科学技术项目(02JK158);西安市科技攻关项目(GG200126)资助项目

摘　　要：提出了一种新颖的基于小位移平面膜片的温度压强同时区分测量的光纤Bragg光栅传感器.该传感器中的光纤Bragg光栅沿径向粘贴于膜片上.光纤光栅中心波长和峰值波长的温度响应灵敏度近似相等,与所加压力无关;压强灵敏度因膜片上所产生的非均匀应变而不同,且与温度无关.通过测量中心波长和峰值波长,实现了单根光栅对温度压强的同时区分测量.从理论和实验上给出了温度、压强响应与峰值波长、中心波长之间的关系式.在30～120℃温度范围和0～6MPa压强范围内,用此传感器测得的温度值和压强值与用温度计测得的温度值和用压力表测得的压强值之间的偏差分别不大于2℃和0.2MPa,此偏差大小与仪表最小分度值2℃和0.1MPa很接近,表明该传感器具有很好的温度、压强响应特性.A novel in-fiber Bragg grating（FBG） sensor for temperature and pressure simultaneous measurement by bonding a single FBG radially on a plat small displacement diaphragm is proposed. The temperature sensitivity of central wavelength is equal to that of peak wavelength and has no relation with the applied pressure, but the pressure sensitivity of central wavelength is different from that of peak wavelength because of the nonuniform strains of the diaphragm when exerts pressure on it,and it has no relation with the temperature as well. So temperature and pressure can be measured simultaneously by measuring the central and peak wavelength of the FBG. The theoretical and experimental expressions of temperature and pressure with the peak and central wavelengths are given by a matrix equation. The differences of the temperature and pressure measured by the sensor compare with that measured by conventional thermometer and pressure gauge are less than 2℃ and 0.2MPa respectively,within the range of 30-120℃ and 0-6MPa. The differences are roughly equal to the minimum division of the thermometer and the pressure gauge used in experiment. It indicates that the FBG sensor has good temperature and pressure response characteristics.

关 键 词：导波与光纤光学 光纤传感 光纤光栅传感 传感器灵敏度 

分 类 号：TN253[电子电信—物理电子学]