摘要
针对利用放射源或非放射源产生大量低能热电子,对亲电子有机物浓度的检测,提出一种线性化电子俘获响应系统。该系统采用PID自动调节的方式实现恒电流频率调制式。系统自动根据亲电子有机物浓度高低,即俘获电子的多少,通过闭环反馈电路实现控制脉冲频率的改变,即吸收电子的电场强度,保持恒定地收集电流;同时系统对基线漂移自动跟踪、自动调节,从而达到改善和提高检测的灵敏度、线性度及线性范围的目的。实验结果显示,该系统具有检测灵敏度高、定量精确、线性范围较宽的优点。另外该系统留有多种通信接口,为仪器智能化程度的提高提供了基础。
A im in g at the detection o f e le c tro p h ilic organic m atter con ce n tra tio n , using ra dioactive or no n-ra dioa ctive sources to producelarge amounts o f low energy hot e le ctro n , th is paper proposes a lin e a r electron capture response system. The system uses P ID autom aticadjustm ent to achieve constant cu rre n t fre que ncy m odulation. A cco rd in g to the le ve l o f e le c tro p h ilic organic m a tter co n ce n tra tio n , w h ich is thenu m ber o f electrons tra p p e d , it achieves con trol o f pulse frequency change a u tom a tically by a closed-loop feedback c irc u it to absorb theele ctro n ic fie ld in te n sity and keeps cu rre n t co lle ctio n c o n s ta n tly , and tracks and adjusts the baseline d rift a u to m a tica lly, so as to im prove andenhance the de tection s e n s itiv ity , lin e a rity and lin e a r range. The experim ental results show that the system has the advantage o f high detections e n s itiv ity , q u a n tita tive precision and w ide lin e a r range. In a d d itio n , the system leaves a varie ty o f com m unication in te rfa ce s, and providesthe basis fo r the increase o f in te llig e n t instrum ent.
作者
王勇军
黄宇青
胡文俊
Wang Yongjun;Huang Yuqing;Hu Wenjun(Shanghai Shangjiqunli Analytical Instrument Co. , Ltd, Shanghai 201107, China;Shanghai Institute of Computing Technology, Shanghai 200040 , China;Shanghai Shenteng Information Technology Co. , Ltd, Shanghai 200040, China)
出处
《计算机应用与软件》
CSCD
2016年第8期234-237,276,共5页
Computer Applications and Software
基金
国家重大科学仪器设备开发专项(2011YQ15007804)
关键词
电子俘获
恒电流频率调制电压
闭环控制
PID
Electron capture
Constant current frequency modulation voltage
Closed-loop control
PID
