ZHANG Wen,LOU Xiao-ping,DONG Ming-li,ZHU Lian-qing.Optical fiber sensor by cascading long period fiber grating with FBG for double parameters measurement[J].Optoelectronics Letters,2017,13(5):372-375 Optical fiber sensor by cascading long period fiber grating with FBG for double parameters measurement Author Name Affiliation ZHANG Wen  Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Information Science and Technology University, Beijing 100016, China Beijing Key Laboratory of Optoelectronic Test Technology, Beijing Information Science and Technology University, Beijing 100192, China  LOU Xiao-ping  Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Information Science and Technology University, Beijing 100016, China Beijing Key Laboratory of Optoelectronic Test Technology, Beijing Information Science and Technology University, Beijing 100192, China  DONG Ming-li  Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Information Science and Technology University, Beijing 100016, China Beijing Key Laboratory of Optoelectronic Test Technology, Beijing Information Science and Technology University, Beijing 100192, China  ZHU Lian-qing  Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Information Science and Technology University, Beijing 100016, China Beijing Key Laboratory of Optoelectronic Test Technology, Beijing Information Science and Technology University, Beijing 100192, China  Abstract:       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 CO2 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. Hits: 4008 Download times: 0 View Full Text    Download reader