Here we report a low-temperature-superconducting (LTS) SQUID based full tensor gradient system. A symmetrical configuration is used with six planar-type gradiometers mounted on the different faces of a hexagonal-pyramid. A tri-axial SQUID magnetometer was used to compensate the imbalance outputs of each planar gradiometer. Direct readout electronics are used to further increase the system robustness. The SQUID outputs are synchronized with a GPS + INS unit for coordinate projection. During indoor tests, a noise level of 100fT/m/√Hz with corner frequency at 10Hz and a static RMS resolution of 10pT/m(0.01-10Hz) were achieved. Principle demonstration was carried out by a ground test over a 10×10 m~2 area using buried iron balls with different weights. The system successfully resolved the abnormalities of all the gradient components at the corresponding locations. The field test was also carried out using a helicopter.
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机译：在这里，我们报告了基于低温超导（LTS）的全张量梯度系统。对称配置用于安装在六边形金字塔的不同面上的六个平面型渐变。三轴鱿鱼磁力计用于补偿每个平面梯度计的不平衡输出。直接读数电子器件用于进一步提高系统鲁棒性。 SQUID输出与用于坐标投影的GPS + INS单元同步。在室内测试期间，实现了10Hz频率频率的100英尺/ m /√Hz的噪声水平和10pt / m（0.01-10Hz）的静态RMS分辨率。原理演示由使用埋藏的铁球具有不同重量的10×10 m〜2区域进行地面测试。系统成功解决了相应位置处所有渐变组件的异常。现场测试也使用直升机进行。
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