光学学报, 2018, 38 (9): 0906001, 网络出版: 2019-05-09
基于掺铒光纤中动态粒子数光栅的振动检测 
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Mechanical Vibration Detection Based on Dynamic Population Gratings Recorded in Er-Doped Optical Fiber
图 & 表
图 1. 吸收饱和的动态光栅形成原理示意图。(a)掺铒光纤中两列相向传输相干波写入动态光栅原理图; (b)稀土离子三能级系统示意图; (c)条纹间距为Λ、对比度m=0.6的注入光相干场图样I(z)和写入光栅的光吸收系数α(z)/α0归一化剖面图
Fig. 1. Schematic diagram of the formation principle of absorption saturation-based dynamic grating. (a) Population grating recorded by two counter-propagation coherent waves in an Er-doped optical fiber; (b) three level energy system of rare-earth ion; (c) profile of the recording interference pattern I(z) with fringe spacing Λ and contrast m=0.6 and a corresponding normalized profile of the optical absorption α(z)/α0 in the recorded grating
图 2. 用于机械振动探测的全光纤双波混频系统示意图
Fig. 2. Schematic of the all-fiber TWM configuration for detection of mechanical vibrations
图 3. 不同功率条件下掺铒光纤的光谱图 。(a)透射模式光谱; (b) 反射模式光谱
Fig. 3. Spectra of EDF in different input powers. (a) transmission mode spectrum; (b) reflection mode spectrum
图 4. 系统在反射镜振幅为0.75 μm和频率为50 Hz条件下的双波混频信号轨迹。(a)普通单模光纤; (b)掺铒光纤
Fig. 4. Trace of two-wave mixing signals under 50 Hz frequency and 0.75 μm amplitude. (a) Using single-mode fiber; (b) using Er-doped fiber
图 6. 振动镜产生的不同频率方波相位调制的双波混频响应信号。(a) 50 Hz; (b) 500 Hz; (c) 1 kHz; (d) 3 kHz; (e) 5 kHz; (f) 10 kHz
Fig. 6. TWM response signal phase-modulated by square wave with different frequencies generated by vibrating mirror. (a) 50 Hz; (b) 500 Hz; (c) 1 kHz; (d) 3 kHz; (e) 5 kHz; (f) 10 kHz
图 7. 双波混频响应信号在不同频率下对应的傅里叶变换频谱。(a) 50 Hz; (b) 500 Hz; (c) 1 kHz; (d) 3 kHz; (e) 5 kHz; (f) 10 kHz
Fig. 7. Fourier spectra of the detected TWM signals under different frequencies. (a) 50 Hz; (b) 500 Hz; (c) 1 kHz; (d) 3 kHz; (e) 5 kHz; (f) 10 kHz
陈溶, 陶传义. 基于掺铒光纤中动态粒子数光栅的振动检测[J]. 光学学报, 2018, 38(9): 0906001. Rong Chen, Chuanyi Tao. Mechanical Vibration Detection Based on Dynamic Population Gratings Recorded in Er-Doped Optical Fiber[J]. Acta Optica Sinica, 2018, 38(9): 0906001.
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