The result shows that under the constant current exciting mode, the exciting magnetic field is the strongest and has a focusing effect, which improves the eddy detection sensitivity considerably.
结果表明，在恒流激励方式下的激励磁场最强，且具有聚焦效果，因而可有效地提高涡流探伤的灵敏度。
Based on thin annular electron beam approximation, the focusing effect of plasma is investigated.
在薄环形束的近似下讨论了等离子体对空心电子束的聚束作用。
Based on thin annular electron beam approximation, the focusing effect of plasma is investigated.
在薄环形束的近似下讨论了等离子体对空心电子束的聚束作用。
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