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为开展壤中汞气测量的地球化学探矿工作,我们对以往试制的GX-1测汞仪又作了改进,于去年试制成GX-2型仪器,并已小批量制作.GX-2测汞仪是借助于原子吸收原理工作的,但在电路设计上,比一般原子吸收类型仪器具有操作简便、灵敏度和稳定性较高的优点.本文重点介绍仪器的电路原理.一整机方框图和主要技术指标图1是整机方框图.汞灯由方波脉冲点燃,发出2537?的紫外光,经反光镜通过吸收池投影到光电倍增管作光电转换,并产生一近似于方波的电压信号.该信号由阻抗变
In order to carry out the geochemical exploration work of measuring mercury in the soil, we made some improvements on the GX-1 mercury analyzer which was trial-produced in the past and made the GX-2 instrument last year and has been produced in small batches. Mercury instrument is based on the principle of atomic absorption, but in the circuit design, than the average atomic absorption type instrument has the advantages of easy operation, high sensitivity and stability. This article focuses on the circuit principle of the instrument. A machine block diagram and the main Technical Specifications Figure 1 is a block diagram of the whole machine.The mercury lamp is ignited by a square wave pulse and emits 2537 的UV light, which is projected onto a photomultiplier tube through a reflection mirror for photoelectrical conversion through a reflector and generates a voltage signal similar to a square wave. The signal changes by the impedance