基于倾斜光纤光栅的相对湿度传感器  

Tilted fiber Bragg grating used for relative humidity sensor

作　　者：苗银萍[1,2] 刘波[2] 刘健[2] 孙华[2] 赵启大[2] 

机构地区：[1]天津理工大学电子信息工程学院,薄膜电子与通信器件天津市重点实验室,天津300384 [2]南开大学现代光学研究所,天津300071

出　　处：《光电子．激光》2010年第7期978-982,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金重点资助项目(60736039);国家自然科学基金资助项目(60806030,10904075);天津市自然科学基金资助项目(08JCYBJC14600);天津市教委重点资助项目(ZD2007709)

摘　　要：提出了一种基于倾斜光纤光栅(TFBG)的包层上覆盖着聚乙烯醇(PVA)的空气相对湿度传感器,成功实现了对相对湿度在20～98%RH范围内的监测。研究发现,TFBG的透射功率在20～74%RH和74～98%RH2个相对湿度区域内分别呈现不同的线性变化,敏感度分别为2.52 dBm/%RH和14.95 dBm/%RH,并且在高湿度区有更高的敏感性。A relative humidity（RH） sensor based on tilted fiber Bragg grating（TFBG） is designed by utilizing polyvinyl alcohol（PVA） as the sensitive cladding film.RH increasing in the PVA coating will result in the reduction of refractive index.Due to the TFBG′s sensitivity to ambient refractive index,the spectral properties of PVA coated TFBG are modified under exposure to different ambient humidity levels ranging from 20% RH to 98% RH.The transmission power of TFBG has different linear behaviors for two different humidity ranges（20%-74% RH and 74%-98% RH）.And the sensitivity for each humidity range reaches as high as 2.52 dBm/%RH and 14.947 dBm/%RH,respectively.Combining the advantages of optical fiber grating and PVA as a smart material,this design involves simple configuration,low cost,compactness,small degree of hysterisis,good repeatability,stability and wide dynamic sensing range as well.Therefore,the sensor could be applied in fast RH detection for normal as well as harsh humidity environments.

关 键 词：光纤传感器 空气相对湿度传感器 聚乙烯醇(PVA)薄膜 折射率敏感特性 倾斜光纤光栅(TFBG) 

分 类 号：TN253[电子电信—物理电子学]