| 基于FPGA的铁磁物质探测系统设计与研究 |
| |
| 引用本文： | 曹海军,李丕丁.基于FPGA的铁磁物质探测系统设计与研究[J].教育技术导刊,2021,20(1):159-163. |
| |
| 作者姓名： | 曹海军 李丕丁 |
| |
| 作者单位： | 上海理工大学 医疗器械与食品学院，上海 200093 |
| |
| 摘 要： | 铁磁性物质对磁共振成像质量、设备安全和相关人员人身安全有着巨大威胁。传统金属检测仪敏感度不同，容易变化且不能分辨被测物是否为铁磁性。国外专用铁磁探测系统性能优异但技术保密严格且价格昂贵，而国内检测产品在灵敏度方面与之相比不占优势。基于FPGA的铁磁物质探测系统设计根据磁通门传感器测磁原理，采用平行式线圈结构，通过基于数字正交锁相放大的二次谐波法对采集的信号进行数字信号处理并对其进行自适应滤波算法处理以提高系统整体性能。实验测试结果表明，该系统较模拟式信号处理抗干扰能力强且使得铁磁性物质探测的灵敏度提高10.3%，实际探测距离由0.5m提高到1m。
|
| 关 键 词： | 磁通门 FPGA 锁相放大 自适应滤波 |
| 收稿时间： | 2020-05-26 |
Design and Research of Ferromagnetic Substance Detection System Based on FPGA |
| |
| CAO Hai-jun,LI Pi-ding.Design and Research of Ferromagnetic Substance Detection System Based on FPGA[J].Introduction of Educational Technology,2021,20(1):159-163. |
| |
| Authors: | CAO Hai-jun LI Pi-ding |
| |
| Institution: | School of Medical Devices and Food Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China |
| |
| Abstract: | Ferromagnetic substances pose a huge threat to the quality of magnetic resonance imaging， the safety of equipment and the personal safety of related personnel. The sensitivity of traditional metal detectors varies easily and cannot distinguish whether the measured object is ferromagnetic. The foreign special ferromagnetic detection system has excellent performance but strict technical confidentiality and high price， while domestic detection products do not have an advantage in terms of sensitivity. The design of the ferromagnetic substance detection system based on FPGA is based on the principle of flux measurement of the fluxgate sensor， adopts a parallel coil structure， and performs digital signal processing on the collected signal through the second harmonic method based on digital quadrature phase lock amplification and apply adaptive filtering algorithm to improve the overall performance of the system. Experimental test results show that the system has stronger anti-interference ability than analog signal processing and the sensitivity of ferromagnetic substance detection is increased by 10.3%， and the actual detection distance is increased from 0.5m to 1m. |
| |
| Keywords: | fluxgate sensor FPGA phase-locked amplifier adaptive filtering |
|
| 点击此处可从《教育技术导刊》浏览原始摘要信息 |
| 点击此处可从《教育技术导刊》下载免费的PDF全文 |
