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本文阐述了利用微型双线圈法测量脉冲磁场梯度的分布形态。微型线圈由于点性好,能较真实地反映微小空间场的分布形态。文中说明了通过调节“对称电路”补偿双线圈的不一致性。微型线圈输出信号微弱。在测量梯度时,两线圈串联反接、输出信号更弱。因此,测量仪器应足够灵敏、分辨率高,且应快速和自动。基于这些要求,设计了测量脉冲信号幅值的仪器,它可同时兼用直读法和交直流比较法两种方法。前者能快速、自动地打印测量数据,后者则有较精确的读数。可用后一方法对前一方法进行校正。仪器与测量线圈配合,测量重复性一般可优于±0.1％。此外,还用了一台能有X、Y、Z三个方向位移的铣床作机械工作台,组成了整套测量系统。用它对一个工艺四极透镜孔中的脉冲场梯度的分布形态进行了测定。测量结果表明透镜孔中磁场梯度分布形态为“马鞍形”。同时还显示了此类透镜磁场的三维特徵。
This paper describes the use of micro double-coil method to measure the distribution of pulsed magnetic field gradient. Micro-coil because of good point, can more accurately reflect the distribution of tiny space field morphology. The article explains how to compensate for the double-coil inconsistency by adjusting the “symmetrical circuit”. Micro-coil output signal is weak. When measuring the gradient, the two coils are connected in series and the output signal is weaker. Therefore, measuring instruments should be sensitive enough, high resolution, and should be fast and automatic. Based on these requirements, the instrument designed to measure the amplitude of the pulse signal, which can be used both direct reading and AC-DC comparison of two methods. The former can quickly and automatically print the measurement data, the latter has a more accurate readings. The latter method can be used to correct the previous method. Instrument and measuring coil with the measurement repeatability generally better than ± 0.1%. In addition, a milling machine capable of displacing in X, Y and Z directions is also used as a mechanical workbench to form a complete measuring system. It was used to measure the distribution of the pulse field gradient in a process quadrupole lens. The measurement results show that the distribution of the magnetic field gradient in the lens hole is “saddle-shaped.” Also shows the three-dimensional characteristics of such a lens magnetic field.