为了提高气相色谱仪用热导检测器的性能,设计了热导检测器的精密恒流源和差压检测电路.恒流源由场效应管IRF460、运算放大器AD8672和线性光耦HCNR201构成,低噪声电桥差压检测电路由2片AD8597构成.建立了差压检测电路的噪声模型,计算了噪声理论值.实际测试结果表明,该热导检测器的基线噪声达到4μV,50 min的基线漂移为15μV,恒流源波动接近1μA,优于现有热导检测器的技术指标.所介绍的设计方案和噪声分析方法对热导检测器的电路设计有较大的参考价值.
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