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本文报告用Ag/Ag_2S电极和磁性聚丙烯酰胺凝胶电解质制成的电化池传感器对磷化氢气体的测定情况。实验结果表明,该传感器的响应速度和恢复速度都较快,使用性能稳定。传感器输出电压(或电流)信号E与所测磷化氢气体的浓度C之间符合C=A[exp(BE)—1]经验关系式。据此设计了一种指数放大电路对传感器的输出信号进行运算放大,使输出信号与磷化氢气体的浓度之间呈现很好的线性关系。
This article reports the determination of phosphine gas by an electrochemical cell sensor made of Ag / Ag_2S electrode and a magnetic polyacrylamide gel electrolyte. Experimental results show that the sensor response speed and recovery speed are fast, stable performance. The relationship between the sensor output voltage (or current) signal E and the measured concentration of phosphine gas C follows the empirical equation C = A [exp (BE) -1]. Accordingly, an exponential amplification circuit is designed to amplify the output signal of the sensor so that there is a good linear relationship between the output signal and the concentration of phosphine gas.