用于飞行时间质谱仪的微电流检测模块  

Micro-current measurement module for TOF-MS

作　　者：闫书雄[1] 辜键洲 石梦桐 朱辉 莫婷 黄正旭[1] 高伟[1] Yan Shuxiong Gu Jianzhou Shi Mengtong Zhu Hui Mo Ting Huang Zhengxu Gao Wei(Institute of Atmospheric Environmental Safety and Pollution Control, Jinan University, Guangzhou 510632,China Guangzhou Hexin Analytical Instrument CO. ,LTD. , Gnangzhou 510530, China College of International Education, Zhengzhou University of Light Industry, Zhengzhou 450002, China)

机构地区：[1]暨南大学大气环境安全与污染控制研究所,广州510632 [2]广州禾信分析仪器有限公司,广州510530 [3]郑州轻工业学院国际教育学院,郑州450002

出　　处：《电子测量技术》2016年第9期64-68,共5页Electronic Measurement Technology

基　　金：国家重大科学仪器设备开发专项(2011YQ170067);广东省工程中心建设项目(2015B0903029)资助

摘　　要：飞行时间质谱仪内部电磁环境复杂,且信号极其微弱,对微电流检测模块有着较高的要求。本工作针对正在研制的大气压接口飞行时间质谱仪制作了一种适用于质谱仪等复杂科学仪器的高精度微电流检测模块。模块由单片机控制,运用改进的电流电压转化法对质谱仪离子信号转换放大,利用标准RS485接口与上位机通讯。对模块进行了最小100fA,量程范围分别为±150nA和±1 500pA两个量级微电流信号的测试,结果表明分辨率可达62.5fA,模块灵敏度高、稳定性好、自适应性强,满足飞行时间质谱仪的检测要求。It is hard for micro‐current measurement in a complex electromagnetic environment ,e .g .time‐of‐flight mass spectrometer （TOF‐MS） .A home‐made high precision micro‐current measurement module was designed for orthogonal acceleration and reflection time‐of‐flight mass spectrometer and other scientific instruments .The module controlled by microcontroller unit （MCU） to measure the signal from TOF‐MS by a new type of I/V resistance feedback amplification circuit ,with RS485 bus between PC and the module for data transmission .In the tests ,the results of both ± 150 nA and ± 1 500 pA levels ,even the minimum value 100 fA ,The result shows that the resolution of the module is 62 .5 fA and all results indicate that the module is high sensitivity , good stability , adaptive and satisfying the operating requirements of TOF‐MS .

关 键 词：飞行时间质谱仪 离子检测 微电流检测模块 

分 类 号：TM216[一般工业技术—材料科学与工程]