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首页> 外文期刊>IEEE Transactions on Applied Superconductivity >HTS SQUID magnetometer with SQUID vector reference for operation inunshielded environment
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HTS SQUID magnetometer with SQUID vector reference for operation inunshielded environment

机译：具有SQUID矢量参考的HTS SQUID磁力计，可在非屏蔽环境下运行

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Using a HTS rf SQUID vector reference, we demonstrated magnetically unshielded operation of an HTS rf SQUID magnetometer. The reference consists of three magnetometer SQUIDS oriented in x, y and z directions. The sensing SQUID magnetometer is z-oriented and positioned at (baseline) distance of 8 cm from the z-reference. A balance (common mode rejection) better than 4000 was achieved by electronic adjustment of the subtraction coefficients of the reference rf SQUID channels in the homogeneous field of large Helmholtz coils. With 3.5 mm diameter washer rf SQUIDs, the magnetic field sensitivity of the magnetometer was 220 fT/√Hz at frequencies greater than 100 Hz in unshielded environment. A frequent task in nondestructive evaluation of materials is the determination of the magnitude and size of ferrous inclusions in non-magnetic metal alloys. As a preliminary test, we used the magnetometer for the detection of ferrous particles in unshielded environment. A magnetized 10 mg particle was identified from a distance of 80 mm by a scan of its remanent field. Magnetocardiograms (MCG) measurements are also performed
机译：使用HTS射频SQUID矢量参考，我们演示了HTS射频SQUID磁力计的非屏蔽操作。该参考由在x，y和z方向上定向的三个磁力计SQUIDS组成。感应SQUID磁力计是z方向的，位于距z参考点8 cm的（基线）距离处。通过电子调节大型亥姆霍兹线圈均质场中参考射频SQUID通道的减法系数，可以实现优于4000的平衡（共模抑制）。使用直径为3.5 mm的垫圈rf SQUID，在非屏蔽环境中，磁力计在大于100 Hz的频率下的磁场灵敏度为220 fT /√Hz。材料无损评估的一项常见任务是确定非磁性金属合金中铁夹杂物的大小和大小。作为初步测试，我们使用了磁力计来检测非屏蔽环境中的铁颗粒。通过扫描其剩余磁场，从80毫米的距离识别出10mg磁化颗粒。还执行心磁图（MCG）测量

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