基于磁性聚合物薄膜的光纤磁场传感探针

Fiber Magnetic Field Sensing Probe Based on Magnetic Polymer Thin Film

为了获得一个高灵敏度法布里-珀罗干涉仪光纤磁场传感探头,采用紫外光固化方法在单模光纤端面集成一个弧形磁性聚合物薄膜。利用条形磁铁作为场源,对干涉仪的腔长和折射率进行调制,对干涉峰峰值波长位置进行监测,实现对磁场强度的传感探测。将磁铁分别垂直和平行于传感探头放置,实验测得传感结构的灵敏度分别为46.77 pm·mT^-1和56.37 pm·mT^-1。该传感器具有成本低、制作方便、灵敏度高、稳定性好等特点,在生物医疗、信息技术等领域有着广泛的应用前景。

To fabricate a high-sensitivity fiber magnetic field sensing probe based on a Fabry-Pérot interferometer, an arc magnetic polymer thin film was integrated on the end face of a single-mode fiber using the UV curing method. Strip magnet was used as the field source to modulate the cavity length and refractive index of the interferometer. By monitoring the wavelength position of the interference peak, the magnetic field intensity was detected. The magnets were placed vertical and parallel to the sensing probe, and the corresponding sensitivities of the sensing structures were 46.77 pm·mT^-1 and 56.37 pm·mT^-1. The sensor has high sensitivity, good stability, and wide application prospects in the various fields, including biological medicine and information technology. Further, the sensor is inexpensive and can be conveniently manufactured.