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前言在测量快变化的参数时,只考虑靜态性能指标不行,还应注意它的动态性能指标。例如某个仪表传感器或测试系统的幅频特性曲线(或称幅频响应)A(ω)如图1所示。当被测信号变化的频率小于ω_1时,这个仪表或传感器能准确地反映被测信号。当被测信号的变化频率在ω_2附近吋,这个仪表或传感器所测出的信号,远远大于真实信号。同理,当被测信号的变化频率在ω_3附近时,这个仪
Foreword In the measurement of fast changing parameters, only consider the static performance index does not work, but also pay attention to its dynamic performance indicators. For example, the amplitude-frequency characteristic (or amplitude-frequency response) A (ω) of an instrument sensor or test system is shown in FIG. 1. When the measured signal frequency changes less than ω_1, the instrument or sensor can accurately reflect the measured signal. When the measured signal frequency changes in the vicinity of ω_2 inch, the signal measured by this instrument or sensor, far greater than the true signal. Similarly, when the measured signal frequency changes in the vicinity of ω_3, this instrument