Experiment study on magnet sensitivity of fiber optic gyro
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摘要: 光纤环是光纤陀螺的敏感部件.除Sagnac效应外,磁光法拉第(Faraday)效应也是光纤陀螺中实际存在的非互易效应.磁光法拉第效应是由于光纤制作工艺和光纤环绕制过程中存在的剩余双折射和光纤扭曲产生的,会在陀螺输出零位中附加一个固定偏置.借助有限元分析法,推导了微段光纤磁光法拉第效应的琼斯矩阵;建立了光纤环受磁场影响的数学模型;采用亥姆霍兹线圈进行了试验验证.试验结果证明了光纤陀螺磁敏感轴是存在并且可以确定的,提出了降低陀螺受磁场影响的具体措施.Abstract: Fiber coil is the sense element of FOG(fiber optical gyroscopes). Except Sagnac effect, magneto-optic Faraday effect is one of the main non-reciprocity effect of FOG. Magneto-optic Faraday effect is caused by fiber twist and residual birefringence during fiber producing and fiber coil winding. It can add one bias in the output of FOG. Based on the finite element analysis,the magnetic model of FOG’s fiber coil is given by using the Jones matrices formalism. The experiment verification is made by using the Helmholtz coil. The result shows that a existing fixed magnet sensitivity axis represents the magnet sensitivity of FOG and the direction of magnet sensitivity axis can be confirmed.And the ways to suppressing the magnetic field effects are discussed.
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Key words:
- fiber optic sensors /
- gyroscopes /
- magnetooptical effects /
- magnetic field effects
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