恒电量法中计算机采样数据的预处理

本文利用窗函数的方法设计了一个非递归数字滤波器(FIR),并采用一种较为简单的方法代替了非递归数字滤波器设计中必须采用快速傅里叶变换(FFT) 来计算滤波器的系数。同时又采用一系列的措施提高滤波器的滤波能力,并尽量减少滤波后曲线的畸变。在设计FIR滤波器时,考虑了矩形窗口、海宁窗口、汉明窗口、布拉克曼窗口和凯泽窗口5种窗口函数。通过理论分析和实验验证表明凯泽窗口具有较为满意的滤波效果。

COMPUTER SAMPLED DATA PRE-PROCESSING OF THE COULOSTATIC TECHNIQUES

An improvement in designing non-recursive digital filter for coulostatic measurements is pro- posed.The new technique involves not only measur ements of filter coefficients,i.e.unit impulse response addend series by FFT (Fast Fourier Transformation),but also improvements of filter capability and allevia- tion of filtered curve distortion by a series of means. In designing the non-recursive digital filter,five window functions,Rectangle,Haning,Hamming, Blackman and Kaiser windows are all considered.The Kaiser window is verified both theoretically and ex- perimentally to be a capable filter.