微电流化学信号拾取和处理方法的研究

ON PICKING-UP AND PROCESSING METHOD OF MICRO-CURRENT CHEMICAL SIGNALS

微电流化学信号拾取和处理方法需要硬件和软件相结合,硬件上采用对数和反对数转换技术,将微电流信号进行电流-电压对数转换,并使用晶体管进行温度补偿,综合提高输入信号的动态范围及信号信噪比;软件上采用软件高斯低通滤波处理,利用其三次均值滤波逼近高斯滤波算法,提高系统计算的有效率,并对白噪声进行有效过滤。

The picking-up and processing method of micro-current chemical signal need to combine computer hardware with its software. In hardware, logarithm and antilogarithm converters are used to carry out logarithm current-voltage conversion of the micro-current signal, mean- while the transistors is used to compensate the temperature fluctuation in the converter. This Will increase the input signal＇ s dynamic range and improves the signal-noise ratio comprehensively. In software, the Gaussian low-pass filtering processing is employed. The third power mean value filtering is used to approach Gaussian algorithm for increasing the calculation efficiency of the system, and also effectively filtering the blank noise.