A novel distributed feedback（DFB） fiber laser sensor, which can measure acoustic and magnetic fields simultaneously, is proposed. The magnetic field can be measured by detecting the change of resonant frequency of t...A novel distributed feedback（DFB） fiber laser sensor, which can measure acoustic and magnetic fields simultaneously, is proposed. The magnetic field can be measured by detecting the change of resonant frequency of the fiber laser, and the acoustic pressure can be measured by detecting the phase shift of the fiber laser. Both of the signals can be simultaneously demodulated in the frequency domain without affecting each other. Experimental studies show that the acoustic pressure sensitivity of this sensor is about-130 d B（0 dB re 1 pm∕μPa） and the sensor has a good linearity with a magnetic field sensitivity of 0.57 Hz∕mT.展开更多
对超细型DFB光纤激光水听器探头封装进行了研究。通过有限元方法建立了封装结构理论模型,探讨了影响超细型光纤激光水听器频率响应与灵敏度起伏之间的因素,在灵敏度、频响一致性等指标间找到了平衡点。最后,制作了光纤激光水听器,直径6 ...对超细型DFB光纤激光水听器探头封装进行了研究。通过有限元方法建立了封装结构理论模型,探讨了影响超细型光纤激光水听器频率响应与灵敏度起伏之间的因素,在灵敏度、频响一致性等指标间找到了平衡点。最后,制作了光纤激光水听器,直径6 mm,长度55 mm,灵敏度-130 d B,100 Hz^2 k Hz灵敏度响应起伏4 d B,通过测试验证了理论分析和仿真的符合性。展开更多
基金supported by the Key R&D Program of China(No.2017YFB0405503)the Youth Innovation Promotion Association of CAS(No.2016106)
文摘A novel distributed feedback（DFB） fiber laser sensor, which can measure acoustic and magnetic fields simultaneously, is proposed. The magnetic field can be measured by detecting the change of resonant frequency of the fiber laser, and the acoustic pressure can be measured by detecting the phase shift of the fiber laser. Both of the signals can be simultaneously demodulated in the frequency domain without affecting each other. Experimental studies show that the acoustic pressure sensitivity of this sensor is about-130 d B（0 dB re 1 pm∕μPa） and the sensor has a good linearity with a magnetic field sensitivity of 0.57 Hz∕mT.
文摘对超细型DFB光纤激光水听器探头封装进行了研究。通过有限元方法建立了封装结构理论模型,探讨了影响超细型光纤激光水听器频率响应与灵敏度起伏之间的因素,在灵敏度、频响一致性等指标间找到了平衡点。最后,制作了光纤激光水听器,直径6 mm,长度55 mm,灵敏度-130 d B,100 Hz^2 k Hz灵敏度响应起伏4 d B,通过测试验证了理论分析和仿真的符合性。
