氢火焰离子检测器微小电流检测系统设计  

Micro current detection system of hydrogen flame ionization detector

作　　者：范维志 蒲国健 李胜 高文刚[2] 

机构地区：[1]新疆鄯善中油测井吐哈事业部,鄯善838202 [2]西南石油大学电气信息学院,成都610500

出　　处：《电子测量技术》2013年第10期11-15,共5页Electronic Measurement Technology

摘　　要：气相色谱分析是物质分离分析的一种重要手段,在众多领域应用日趋普遍。通过对检测组分进行处理后,使之以电信号的方式被检测。氢火焰离子检测器是气相色谱检测器其中一类,由于其检测信号微弱,范围较宽,使得对检测器中微小电流放大技术的研究和实现都有较大的难度和局限性。设计了高阻抗、低漏电流的场效应管作为反馈元件构成的对数放大电路检测系统,实现对490pA^12μA范围内的电流检测,以及自校准调零电路确保测量数据误差小于3%。降低了氢火焰离子检测器检测电路的复杂度,提高了系统精度,在现有气相色谱检测器处理宽范围微弱电流信号的方法上提出了一种新的解决方法。Gas chromatographic analysis is an important means to be applied in material separation in many fields.It has become increasingly common.By processing the detected component after the manner of an electric signal is detected.Flame ionization detector is one of the gas chromatographic detectors,due to its micro signal,wide range,making the detector in the micro current amplification technology research and implementations have greater difficulty and limitations.The logarithmic amplification is designed by the high impedance,low leakage currents feedback element FET to realize the range of 490 pA～ 12 μA current detection.The error is less than 3％ by self-calibration circuits.The system reduced complexity of hydrogen flame ionization detector circuit,and improved the system accuracy.A new solution is proposed at existing Gas chromatographic analysis.

关 键 词：离子检测器 微小电流 对数放大 自校准 

分 类 号：TH843[机械工程—仪器科学与技术]