Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan.
Department of Biological Functions Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan.
Sensors (Basel). 2019 Jul 24;19(15):3254. doi: 10.3390/s19153254.
In recent advanced information society, it is important to individually identify products or living organisms automatically and quickly. However, with the current identifying technology such as RFID tag or biometrics, it is difficult to apply to amphibians such as frogs or newts because of its size, stability, weakness under a wet environment and so on. Thus, this research aims to establish a system that can trace small amphibians easily even in a wet environment and keep stable sensing for a long time. The magnetism was employed for identification because it was less influenced by water for a long time. Here, a novel magnetization-free micro-magnetic tag is proposed and fabricated with low cost for installation to a living target sensed by Magneto-Optical sensor for high throughput sensing. The sensing ability of the proposed method, which was evaluated by image analysis, indicated that it was less than half of the target value (1 mm) both in the water and air. The FEM analysis showed that it is approximately twice the actual identification ability under ideal conditions, which suggests that the actual sensing ability can be extended by further improvement of the sensing system. The developed magnetization-free micro-magnetic tag can contribute to keep up the increasing demand to identify a number of samples under a wet environment especially with the development of gene technology.
在当今先进的信息社会中，个体自动快速识别产品或生物变得尤为重要。然而，由于青蛙或蝾螈等两栖动物的体型小、在潮湿环境下稳定性差、脆弱等特点，目前的识别技术（如 RFID 标签或生物识别技术）难以应用于这些动物。因此，本研究旨在建立一个系统，即使在潮湿环境下也能轻松追踪小型两栖动物，并能长时间保持稳定的感应。由于磁性受水的影响较小，因此本研究采用了磁性进行识别。在此，提出并制作了一种新颖的无磁化微磁标签，成本低，可安装在磁光传感器上，用于对大批量的活体目标进行感应。通过图像分析对所提出方法的感应能力进行了评估，结果表明，无论是在水中还是空气中，其感应能力均小于目标值（1 毫米）的一半。有限元分析表明，在理想条件下，其实际识别能力约为实际值的两倍，这表明通过进一步改进感应系统可以提高实际的感应能力。所开发的无磁化微磁标签可有助于满足在潮湿环境下识别大量样本的日益增长的需求，特别是随着基因技术的发展。
