Measurement of metallic contaminants in food with a high-Tc SQUID
Measurement of metallic contaminants in food with a high-Tc SQUID
复制标题
使用高 Tc SQUID 测量食品中的金属污染物
DOI：
10.1088/0953-2048/17/4/009
复制
发表时间：
2004
影响因子：
3.6
通讯作者：
Y. Hatsukade
中科院分区：
文献类型：
--
作者：
Saburo Tanaka;Miyuki Natsume;M. Uchida;N. Hotta;T. Matsuda;Zarina A Spanut;Y. Hatsukade
我们提出并演示了一种用于检测食品中金属污染物的高tc SQUID系统。为了确保食品安全，不仅需要开发检测磁性材料的系统，还需要开发检测食品中铜和铝等非磁性材料的系统。该系统由一个SQUID磁强计、一个励磁线圈和一个永磁体组成。对于非磁性样品，在检测过程中施加交流磁场以诱导样品中的涡流。对于可磁化的样品，在检测之前对样品施加强磁场。例如，我们能够检测直径为0.1毫米的不锈钢球和直径小于1毫米的铜球。
We have proposed and demonstrated a high-Tc SQUID system for detecting metallic contaminants in foodstuffs. There is a demand for the development of systems for detecting not only magnetic materials but also non-magnetic materials such as Cu and aluminium in foodstuffs to ensure food safety. The system consists of a SQUID magnetometer, an excitation coil and a permanent magnet. For a non-magnetic sample, an AC magnetic field is applied during detection to induce an eddy current in the sample. For a magnetizable sample, a strong magnetic field is applied to the sample prior to the detection attempt. We were able to detect a stainless steel ball with a diameter of 0.1 mm and a Cu ball less than 1 mm in diameter, for example.