Optical fiber sensor by cascading long period fiber grating with FBG for double parameters measurement  

作　　者：张雯 娄小平 董明利 祝连庆 

机构地区：[1]Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Information Science and Technology University [2]Key Laboratory of Modern Measurement Control Technology, Ministry of Education, Beijing Key Laboratory for Optoelectronics Measurement Technology, Beijing Information Science and Technology University [3]Beijing Key Laboratory of Optoelectronic Test Technology, Beijing Information Science and Technology University

出　　处：《Optoelectronics Letters》2017年第5期372-375,共4页光电子快报（英文版）

基　　金：supported by the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT_16R07);the Project Plan of Beijing Municipal Education Commission for Enhancing the Innovation Capability in 2015(No.TJSHG201510772016);the Open Project of Beijing Engineering Research Center of Optoelectronic Information and Instruments(No.GD2016008)

摘　　要：An optical fiber sensor for strain and temperature measurement based on long period fiber grating(LPFG) cascaded with fiber Bragg grating(FBG) structure has been proposed and realized both theoretically and experimentally. Theoretical analysis shows that two microstructures with similar sensitivities cannot be used for double parameters measurement. The LPFG is micromachined by the CO_2 laser, and the FBG is micromachined by the excimer laser. For the validation and comparison, two FBGs and one LPFG are cascaded with three transmission valleys, namely FBG1 valley at 1 536.3 nm, LPFG valley at 1 551.2 nm, and FBG2 valley at 1 577.3 nm. The temperature and strain characteristics of the proposed sensor are measured at 45—70 °C and 250—500 με, respectively. The sensitivity matrix is determined by analyzing wavelength shifts and parameter response characterization of three different dips. The proposed optical fiber sensor based on LPFG cascaded with FBG structure can be efficiently used for double parameters measurement with promising application prospect and great research reference value.

关 键 词：Carbon dioxide lasers Diffraction gratings Excimer lasers Fibers LANDFORMS Optical fibers Parameter estimation Temperature measurement 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]