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本文对最小平方数字滤波的滤波窗口宽度,初始点的位置,多项式次幂以及噪声频率等重要参数进行了理论和实验研究。提出用波动性和相似性参量来表征滤波效果,给出了选择最适宜滤波参数值的原则,并用于电化学测量数据的处理,从而提高了检测的灵敏度。采用微分脉冲付安法和数字滤波处理,能够从噪声严重干扰的信号来检测0.1M KNO_3溶液中的5ppb 的 Cd~(2+)。
In this paper, the theoretical and experimental researches on the parameters such as the window width of the least squares digital filter, the position of the initial point, the polynomial power and the noise frequency are carried out. It is proposed to characterize the filtering effect by using the parameters of volatility and similarity. The principle of choosing the most suitable filtering parameter value is given and used to process the electrochemical measurement data to improve the detection sensitivity. Using differential pulse compensation and digital filtering, 5 ppb of Cd 2+ in a 0.1 M KNO 3 solution can be detected from a signal that is heavily noisy.