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本文介绍 APZ 型交流磁场调制塞曼原子吸收光谱仪器的工作原理及电路设计.采用 LC 供电全波交流磁场,电磁铁功耗为 P—E 公司仪器的四分之一,采用微机快速采样.数据处理和图形显示。测量电路由检测,同步及电源三部分组成.检测电路由前置放大,交流放大和两路采样保持通道组成.前置级由电流—电压转换电路和暗电流补偿电路组成.为保持磁场,HCL 和采样脉冲三者严格同步.应用了相位反馈控制技术,仪器还具有基线漂移校正功能.
This paper introduces the working principle and circuit design of APZ-AC magnetic field modulation Zeeman atomic absorption spectrometer.Using LC-powered full-wave AC magnetic field, the electromagnet consumes one quarter of the power of P-E instrument, Processing and graphic display. The measurement circuit consists of three parts: detection, synchronization and power supply. The detection circuit is composed of preamplifier, AC amplification and two sample and hold channels. The preamp is composed of current-voltage conversion circuit and dark current compensation circuit. To maintain the magnetic field, HCL And the sampling pulse three strict synchronization.Applied phase feedback control technology, the instrument also has baseline drift correction.