Optical fiber sensor by cascading long period fiber grating with FBG for double parameters measurement |
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| Authors: | ZHANG Wen LOU Xiao-ping DONG Ming-li and ZHU Lian-qing |
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| Affiliation: | 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,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,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 and 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 |
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| 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. |
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