现代科学仪器2023，Vol.40Issue(6)：5-10,6.
改进调制脉冲式电子捕获检测器电路的设计及其应用
Design and Application of Improved Pulse-modulatedElectron Capture DetectorCircuit
摘要
Abstract
Electron capture detector is one of the commonly used detectors in gas chromatography analysis.The detector circuits mainly include single-electrode constant pulse type and single-electrode modulation frequency type.In this paper,an improved modulated pulse type circuit is designed,including floating ground voltage and adjustable reference current unit,signal acquisition and amplification unit,FPGA control unit,signal acquisition and driving unit,charge conservation pulse width modulation unit and signal output unit,etc.The detection limit of the detector can be effectively reduced by pulse width modulation of the modulated frequency signal according to the charge conservation,which can reduce the noise of output signaland improve the signal-to-noise ratio.After testing,the instrument detection limit is 2.3×10-14g/mL,which is nearly 1 order of magnitude lower than the detector of a typical circuit.关键词
电子捕获检测器/气相色谱/调制脉冲/电荷守恒/脉宽调制Key words
Electron capture detector/Gas Chromatography/Pulse-modulated/Charge conservation/PWM引用本文复制引用
邢小兵,强伟锋,赵天悦..改进调制脉冲式电子捕获检测器电路的设计及其应用[J].现代科学仪器,2023,40(6):5-10,6.基金项目
该文得到中关村国家自主创新示范区高精尖产业协同创新平台项目:现代农业检测技术与装备协同平台支持 （）
