Optical fiber magnetic field sensors with peanut-shape structure cascaded with LPFG

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• 作者：Ye Cao 曹晔 ; Yue Zhao 赵月 ; Zheng-rong Tong 童峥嵘 ; Yan Wang 王艳
• 刊名：Optoelectronics Letters
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：12
• 期：5
• 页码：358-360
• 全文大小：398 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Applied Optics, Optoelectronics and Optical Devices
  Chinese Library of Science
  
• 出版者：Tianjin University of Technology, co-published with Springer-Verlag GmbH
• ISSN：1993-5013
• 卷排序：12

文摘

An optical fiber magnetic field sensor for the dual-parameter simultaneous measurement is proposed and demonstrated. The sensor head is constructed by a peanut-shape structure and long period fiber grating (LPFG) coated by magnetic fluid (MF). The external magnetic field intensity can be measured by the variation of characteristic wavelength (Dip1 and Dip2) in interference spectrum since the effective refractive index of MF changes with external magnetic field intensity. When the external magnetic field intensity changes from 0 mT to 20 mT, the magnetic field sensitivities of Dip1 and Dip2 are −0.064 nm/mT and −0.041 nm/mT, respectively. Experimental results show that the temperature sensitivities of the Dip1 and Dip2 are 0.233 nm/°C and 0.186 nm/°C, respectively. Therefore, the simultaneous measurement of the magnetic field intensity and temperature is demonstrated based on the sensitive matrix. It has some potential applications in aerospace, environmental monitoring and medical sensing fields.