论文标题
梯度自旋回波增强质子进液表：一种新型现场梯度测量系统
Gradient spin echo enhanced proton precession magnetometer: a novel system for field gradient measurement
论文作者
论文摘要
梯度自旋回波增强的质子进液表是一个新型系统，除了磁场外，还可以测量背景场的一阶梯度。该系统包括配备Maxwell线圈对和电子设备的常规质子进动磁力仪，可进行梯度自旋回声实验。在梯度自旋回波过程中，基于背景梯度场，开关梯度场和开关反转时间，自旋回波信号在理论上可预测的时间内形成。这种方法的重要优点是，与传统的质子梯度计相反，该质子梯度计测量了两个不同点之间的磁场差，梯度自旋回波增强的质子磁力计测量了在测量磁场的同一位置的场梯度。结果表明，通过使用此系统，对于梯度场的平均均方根误差为-0.25μt/m至 +0.25μt/m，梯度场的平均均方根误差为0.02μt/m。通过优化该系统，可以大大减少上述误差，并且该仪器可用于许多不同的应用。
Gradient spin echo enhanced proton precession magnetometer is a novel system which can measure the first order gradient of the background field in addition to the magnetic field. The system includes a conventional proton precession magnetometer equipped with Maxwell coil pair and electronics which allow to conduct the gradient spin echo experiment. In gradient spin echo process, based on the background gradient field, the switching gradient field and the switching reversal time, the spin echo signal forms at a theoretically predictable time. The important advantage of this approach is that in contrast to conventional proton gradiometers which measure the magnetic field difference between two different points, gradient spin echo enhanced proton magnetometer measures the field gradient at the same position where the magnetic field is being measured. It is shown that by using this system the background gradient field is measured with an average root mean square error of 0.02μT/m for gradient fields in the range of -0.25μT/m to +0.25μT/m. By optimization of this system, the mentioned error could be significantly decreased and the instrument could be used for many different applications.
