Study on the Characters of Phase-Shifted Fiber Bragg Grating in Asymmetric Perturbation and Its Application in Fiber Laser Acoustic Sensor  

作　　者：Yanjie ZHAO Jiasheng NI Faxiang ZHANG Zhiqiang SONG Luyan LI Ting CHEN Shuang LI 

机构地区：[1]School of Science, Shandong Jianzhu University, Jinan 250101, China [2]Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China

出　　处：《Photonic Sensors》2018年第4期351-357,共7页光子传感器（英文版）

基　　金：This work was supported by the Natural Science Foundation of Shandong Province of China （Grant No. ZR2016FB03）, the National Natural Science Foundation of China （Grant No. 61705121＆ No.21603122）, and the Ph.D. Foundation of Shandong Jianzhu University （Grant No. XNBS1535）.

摘　　要：A n-phase-shifted fiber Bragg grating theoretical model is established, and the effects of an asymmetric and symmetrical perturbation field on a phase-shifted fiber Bragg grating are investigated in this paper. The trends of wavelength shifting caused by effective refraction index of phase shift grating in symmetric and asymmetric acoustic field are investigated in detail. Then, the fiber laser acoustic sensors packaged in asymmetric and symmetrical structures are designed and tested, respectively. The results show that the acoustic response of the wavelength of the distributed feedback （DFB） fiber laser （FL） in an asymmetric packaging structure is much more sensitive than in that in the symmetrical structure. The sensor packaged in the asymmetrical structure has a better low frequency （0Hz-500Hz） performance and a higher sensitivity than that in the symmetrical structure, and the sensitivity is improved about 15dB in average and 32.7dB in maximum. It provides a new method to improve the sensitivity of the fiber acoustic sensor.A n-phase-shifted fiber Bragg grating theoretical model is established, and the effects of an asymmetric and symmetrical perturbation field on a phase-shifted fiber Bragg grating are investigated in this paper. The trends of wavelength shifting caused by effective refraction index of phase shift grating in symmetric and asymmetric acoustic field are investigated in detail. Then, the fiber laser acoustic sensors packaged in asymmetric and symmetrical structures are designed and tested, respectively. The results show that the acoustic response of the wavelength of the distributed feedback （DFB） fiber laser （FL） in an asymmetric packaging structure is much more sensitive than in that in the symmetrical structure. The sensor packaged in the asymmetrical structure has a better low frequency （0Hz-500Hz） performance and a higher sensitivity than that in the symmetrical structure, and the sensitivity is improved about 15dB in average and 32.7dB in maximum. It provides a new method to improve the sensitivity of the fiber acoustic sensor.

关 键 词：Fiber acoustic sensor phase-shifted fiber Bragg grating asymmetric perturbation 

分 类 号：TN65[电子电信—电路与系统] TS251.1[轻工技术与工程—农产品加工及贮藏工程]