摘要
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+)。
The parameters important in design of a microcomputer-based least-square digital fil-ter,such as the window width,the location of the initial point,the degree of polynominaland the noise frequency,are studied theoretically and experimentally.The variables,fluctu-ation and similarity,are proposed to chracterize the performance of a digital filter.Theprinciples of theeir optimization are given and used in data smoothing of electrochemicalmeasurements.The sensitivity is highly improved.It has been shown that 5 ppb Cd in0.1MKNO_3 solution,which can not be determined directly by the ordinary differentialpulse voltammetry,is detectable with the help of the present technique.
出处
《计算机与应用化学》
CAS
CSCD
1989年第1期51-55,共5页
Computers and Applied Chemistry
关键词
滤波参数
电化学测量
伏安法
Window width
Electrochemical measurement
Noise frequency
Differential pulse voltammetry
