23 February 2009 Polarization maintaining fiber magnetic sensor based on the digital phase generated carrier technology
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Abstract
A polarization maintaining fiber (PMF) magnetic field sensor based on a digital phase generated carrier (PGC) technology is presented. A magnetic sensor constructed with two magnetostrictive strips attached on the sensing fiber is joined in the sensing arm of a fiber Michelson interferometer. The fiber optic interferometric system is made of all PMF, which inhibits the polarization-induced signal fading. The light source is a fiber laser which can be modulated directly. The PGC metnod is used to demodulate magnetic field signal avoiding phase induced interferometric signal fading, and ensure the sensing partto be all fiber structure. A fiber optic magnetic field sensor with appreciate size for the fiber optic hydrophone towed array is obtained, which can be used to sense the enviromental magnetic field along the sensing direction.This sensor is a good choice for the directional angle measurement through sensing the Earth magnetic field in the array shape measurement of a fiber optic hydrophone towed array.
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Xueliang Zhang, Xueliang Zhang, Zhou Meng, Zhou Meng, Zhengliang Hu, Zhengliang Hu, Huayong Yang, Huayong Yang, Zhangqi Song, Zhangqi Song, Yongming Hu, Yongming Hu, } "Polarization maintaining fiber magnetic sensor based on the digital phase generated carrier technology", Proc. SPIE 7278, Photonics and Optoelectronics Meetings (POEM) 2008: Fiber Optic Communication and Sensors, 72781N (23 February 2009); doi: 10.1117/12.821062; https://doi.org/10.1117/12.821062
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