A compact fiber-optic magnetic-field sensor based on tapered all-solid waveguide-array fiber (WAF) and magnetic fluid (MF) has been proposed and experimentally demonstrated. The tapered all-solid WAF is fabricated by using a fusion splicer, and the sensor is formed by immersing the tapered all-solid WAF into the MF. The transmission spectra have been measured and analyzed under different magnetic-field intensities. Experimental results show that the acquired magnetic-field sensitivity is 44.57 pm/Oe for a linear magnetic-field intensity range from 50 to 200 Oe. All-solid WAF has very similar thermal expansion coefficient for high-and low-refractive-index glasses, so mode profile is not affected by thermal drifts. Also, magnetically induced refractive-index changes into the ferrofluid are of the order of similar to 5 x 10(-2), while the corresponding thermally induced refractive-index changes into the ferrofluid are expected to be lower. The temperature response has also been detected, and the temperature-induced wavelength shift perturbation is less than 0.3 nm from temperature of 26.9 degrees C-44 degrees C. The proposed magnetic-field sensor has such advantages as low temperature sensitivity, simple structure, and ease of fabrication. It also indicates that the magnetic-field sensor based on tapered all-solid WAF and MF is helpful to reduce temperature cross-sensitivity for the measurement of magnetic field. (C) 2015 Optical Society of America
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机译：提出了一种基于锥形全固态波导阵列光纤（WAF）和磁流体（MF）的紧凑型光纤磁场传感器，并进行了实验验证。通过使用熔接机制造锥形全固态WAF，并通过将锥形全固态WAF浸入MF中来形成传感器。已经在不同的磁场强度下测量和分析了透射光谱。实验结果表明，线性磁场强度范围为50至200 Oe时，获得的磁场灵敏度为44.57 pm / Oe。对于高折射率玻璃和低折射率玻璃，全固态WAF的热膨胀系数非常相似，因此模式分布不受热漂移的影响。同样，进入铁磁流体的磁感应折射率变化与5 x 10（-2）相似，而进入铁磁流体的相应的热感应折射率变化预计会更低。还已经检测到温度响应，并且从26.9摄氏度到44摄氏度的温度，温度引起的波长偏移扰动小于0.3 nm。所提出的磁场传感器具有温度灵敏度低，结构简单和易于操作的优点。易于制造。这也表明基于锥形全固态WAF和MF的磁场传感器有助于降低温度交叉敏感度，以测量磁场。 （C）2015年美国眼镜学会
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