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随着对带状电缆需求的急剧上升,因此要求导体间距和其它结构参数的稳定性更加好,这就迫切需要研制测量这些结构参数的设备。作者研制出一种采用电磁感应的新颖间距传感器,它不受带状电缆金属导体被覆薄膜凸出部或薄膜之间粘合剂的影响。这种间距传感器利用含有绝缘孔的电磁屏蔽体来形成一个波峰较陡的不匀强高频磁场。带状电缆穿过该磁场时,在导体间按其相对位置感生出不同强度的涡流。因此,用接收线圈来测量涡流的变化,能以±50μm的精密确定导体间距。本文讨论了电磁感应型间距传感器的工作原理、带状电缆结构参数测试系统的结构,还探讨了测量误差分析和测试性能评估。
With the rapid increase in the demand for ribbon cables, the stability of the conductor spacing and other structural parameters is required to be greater, and there is an urgent need to develop equipment to measure these structural parameters. The authors have developed a novel pitch sensor using electromagnetic induction which is not affected by the adhesive between the film projections or the film of the metal conductor coated strip conductor. This pitch sensor uses an electromagnetic shield containing insulating holes to create a steep, high-frequency, non-uniform magnetic field. When the ribbon cable passes through the magnetic field, eddy currents of different intensities are induced in the conductors according to their relative positions. Therefore, the change of the eddy current is measured by the receiving coil, and the conductor pitch can be accurately determined by ± 50 μm. This article discusses the working principle of the electromagnetic induction distance sensor, the structure of the ribbon cable test system structure, also discusses the measurement error analysis and test performance evaluation.