论文标题
检测具有手持磁性传感器的磁性墨水条形码
Detecting Magnetic Ink Barcodes with Handheld Magnetoresistive Sensors
论文作者
论文摘要
使用基于磁性技术在条形码中编码的信息是读取埋在非透明表面下方的数据的独特策略，因为不需要代码和读取器之间的直接视线。该技术在安全标签和可回收包装应用程序中特别感兴趣。但是，当前的磁性读数（例如用于磁性墨水特征识别的磁性读数）需要与磁性结构接触，从而限制了可以读取信息的深度。本文描述了一种通过用隧道磁磁铁（TMR）传感器代替传统电感头来克服限制的策略。软磁代码可以使用常规的LaserJet碳粉打印，并且通过将其磁化设置为设备中的永久磁铁，可以使用TMR传感器读取所得的磁场。我们证明，这种设备可以在至少1 mm的深度处读取条形码。接触时使用时，它还可以解决薄至200μm的单个结构。
Information encoding in barcodes using magnetic-based technology is a unique strategy to read data buried underneath non-transparent surfaces since a direct line-of-sight between the code and the reader is not required. This technology is of particular interest in secure labelling and recyclable packaging applications. However, current magnetic reading heads, such as those employed for magnetic ink character recognition, need to be placed in contact with the magnetic structures, limiting the depths at which the information can be read. This paper describes a strategy to overcome that limitation by replacing the traditional inductive heads with tunnel magnetoresistive (TMR) sensors. Soft-magnetic codes can be printed using conventional LaserJet toners and, by having their magnetisation set with a permanent magnet included in the device, the resulting magnetic field can be read using a TMR sensor. We demonstrate that such a device can read barcodes at depths of at least 1 mm. It can also resolve individual structures as thin as 200 μm when used in contact.
