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用无芯光纤(NCF)作为单模-多模-单模(SMS)结构中的多模光波导,并将其浸没在密封于毛细管内的磁流体(MF)中,形成了一种新型的全光纤化磁场传感器。传感器可利用磁场变化时其透射谱中谷值波长的移动或峰值波长处的透射率变化对相应的磁场变化进行测量。完成了传感器的制作并进行了实验研究,在传感器长约9cm时,实验得到的磁场灵敏度分别达到了78pm/Oe和0.129dB/Oe。除了作为磁场传感器,本文装置还可以用来作为磁控可调光衰减器或光调制器。
Using a coreless fiber (NCF) as a multimode optical waveguide in a single mode - multimode - single mode (SMS) structure and immersing it in a magnetic fluid (MF) sealed in a capillary, a novel All optical fiber magnetic field sensor. The sensor can measure the change of the corresponding magnetic field by the shift of the valley wavelength in the transmission spectrum at the time of the change of the magnetic field or the change of the transmittance at the peak wavelength. The fabrication of the sensor was completed and an experimental study was carried out. The sensitivity of the obtained magnetic field reached 78 pm / Oe and 0.129 dB / Oe respectively when the sensor length was about 9 cm. In addition to being a magnetic field sensor, the device can be used as a magnetron dimmable attenuator or a light modulator.