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为了测量通电螺线管中的电流,设计了一种基于光纤布拉格光栅(FBG)啁啾效应的电流传感器。磁场中的圆盘形软铁受到通电螺旋管线圈磁场力的作用,引起矩形悬臂梁变形,从而导致粘贴在悬臂梁侧边的FBG的反射光谱带宽发生变化,其大小与电流强度成平方关系。利用光谱分析仪(OSA),通过检测FBG反射谱带宽的变化量,可以得到被测电流强度的大小。当OSA的分辨率为0.02nm时,测量范围达到了27.1~1 000mA。实验结果表明,FBG反射光谱带宽的变化量对温度变化不敏感,当温度从-15℃变化到45℃时,3dB带宽的最大变化约为5pm。实验结果和理论分析一致,表明本文该方案切实可行。
In order to measure the current in the solenoid, a current sensor based on the fiber Bragg grating (FBG) chirp effect was designed. The disc-shaped soft iron in the magnetic field is affected by the magnetic field force of the solenoid coil, causing the deformation of the rectangular cantilever beam, resulting in a change in the reflection spectrum bandwidth of the FBG affixed to the side of the cantilever beam, with a square relationship between the magnitude and the current intensity. By using the spectrum analyzer (OSA), the magnitude of the measured current intensity can be obtained by detecting the variation of the bandwidth of the FBG reflection spectrum. When the OSA resolution of 0.02nm, the measurement range reached 27.1 ~ 1 000mA. The experimental results show that the variation of bandwidth of FBG reflection spectrum is insensitive to the change of temperature. When the temperature changes from -15 ℃ to 45 ℃, the maximum change of 3dB bandwidth is about 5pm. The experimental results are consistent with the theoretical analysis, which shows that this scheme is practical.