低场核磁共振信号检测电路设计
PDF下载 (522)邹庭浪,孙伟达,谢建军,郭智勇,邬杨波.低场核磁共振信号检测电路设计[J].宁波大学学报(理工版),2022,35(6):1-8.DOI:
ZOU Tinglang,SUN Weida,XIE Jianjun,GUO Zhiyong,WU Yangbo.Design of low field NMR signal detection circuit[J].Journal of Ningbo University(Natural Science & Engineering Edition),2022,35(6):1-8.DOI:
| Title: | Design of low field NMR signal detection circuit |
| 作者: | 邹庭浪, 孙伟达, 谢建军, 郭智勇, 邬杨波 |
| Author(s): | ZOU Tinglang, SUN Weida, XIE Jianjun, GUO Zhiyong, WU Yangbo |
| 关键词: | 低场核磁共振信号检测; 微弱信号检测; 核磁共振 |
| Keywords: | low field NMR signal detection; weak signal detection; NMR |
| 分类号: | TM937 |
| 文献标识码: | A |
| 摘要: | 核磁共振检测以其快速、不破坏样品、直观反映分子结构等优点在诸多领域有着非常广泛的应用. 针对核磁共振检测仪器价格昂贵、体积庞大、操作复杂、不便于实现现场检测等问题, 设计了一种面向小型化低成本低场核磁共振仪的核磁共振信号检测电路. 所提出的电路使用低噪声前置放大器实现传感信号放大, 基于锁定放大的微弱信号检测技术实现了对核磁共振回波信号的有效检测. 实际测试结果表明, 所设计的电路放大倍数高达20000倍, 在高倍噪声的干扰下能够准确检测出幅度在5μV及以上的有用信号. 所提出的低场核磁共振信号检测电路对于发展低成本核磁共振仪器具有较好的应用价值. |
| Abstract: | Nuclear magnetic resonance (NMR) detection has been widely used in many fields for its advantages of rapidity, non-destructive sample, and molecular structure visualization. To address the problems with NMR detection instruments, including high price, over-size, complicated operation, and poor operability of field detection, in this paper an NMR signal detection circuit is designed for miniaturized, low-cost low-field NMR instruments. The proposed circuit uses a low-noise preamplifier to amplify the sensing signal. The weak signal detection technique applied in locked amplification effectively detects the NMR echo signal. Test results show that the designed circuit magnifies up to 20000 times. It can accurately detect useful signals at amplitudes of 5μV and above under high noise interference. The proposed low-field NMR signal detection circuit has good application value for developing low-cost NMR instruments. |
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| 备注/Memo: | 收稿日期:2022-03-10.宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:国家自然科学基金（42076193）;浙江省基础公益研究计划（LGF19B050003）. 第一作者:邹庭浪（1997－）,男,江西兴国人,在读硕士研究生,主要研究方向:嵌入式系统设计.E-mail:1872217865@qq.com *通信作者:邬杨波（1972－）,男,浙江奉化人,博士/副教授,主要研究方向:嵌入式系统设计.E-mail:wuyangbo@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
