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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2016 Vol.17 No.2 P.173-184
An analysis in metal barcode label design for reference
Abstract: We employ nondestructive evaluation involving AC field measurement in detecting and identifying metal barcode labels, providing a reference for design. Using the magnetic scalar potential boundary condition at notches in thin-skin field theory and 2D Fourier transform, we introduce an analytical model for the magnetic scalar potential induced by the interaction of a high-frequency inducer with a metal barcode label containing multiple narrow saw-cut notches, and then calculate the magnetic field in the free space above the metal barcode label. With the simulations of the magnetic field, qualitative analysis is given for the effects on detecting and identifying metal barcode labels, which are caused by metal material, notch characteristics, exciting inducer properties, and other factors that can be used in metal barcode label design as reference. Simulation results are in good accordance with experiment results.
Key words: Metal barcode label, Signal detection, AC field measurement, Internet of things
创新点：将无损探伤中交流场测量技术应用于金属条码标签的检测识别，从而克服了金属条码标签抗污损能力差的缺点。
方法：将无损探伤中交流场测量技术应用于金属标签的检测识别中。利用薄膜场理论中刻痕处磁标位势的边界方程和二维傅立叶变换，给出高频线圈激励多刻痕金属标签条件下，金属标签上方空间中磁标位势的解析解，并给出磁场强度分布。通过对空间磁场强度的仿真，定性分析金属标签基底材质、刻痕和激励线圈属性等因素对金属标签识别的影响，为金属标签的设计提供参考。
结论：金属标签基底材质、刻痕和激励线圈属性等因素对金属标签检测识别的分辨能力影响为：（1）ACFM在精确定位刻痕时应选择幅度检测的方式；（2）金属标签基底材料应选择相对磁导率较大的金属；（3）刻痕的位置应尽量靠近激励线圈的中心区域；（4）刻痕深度选择4-8 mm为宜；（5）相比于圆形激励线圈，菱形激励线圈可以提高对刻痕的分辨能力；（6）相比于大尺寸激励线圈，小尺寸激励线圈可以提高对刻痕的分辨能力；（7）相比于小尺寸激励线圈，大尺寸激励线圈可以扩大可分辨区间；（8）通过提高激励频率，可提高ACFM检测过程中抗噪声干扰的能力。
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DOI:
10.1631/FITEE.1500212
CLC number:
O441.5
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On-line Access:
2016-02-02
Received:
2015-07-07
Revision Accepted:
2015-11-23
Crosschecked:
2016-01-06