主要方法仍然是付立叶变换的方法。
快速付立叶变换(FFT)是对谐波进行检测的有效方法。
Fast Fourier Transform (FFT) is an effective method to detect harmonic.
建立在付立叶光学理论基础上的分析与实验结果是一致的。
The analysis based on theory of Fourier optics is in accordance with the results of experiment.
提出了“基于付立叶变换的快速误差分离方法”，并建立起相应的数学模型。
A rapid error separation method based on Fourier transform "is proposed, and corresponding mathematic model is also established."
用付立叶变换红外光谱仪建立了一套全自动红外探测器相对光谱响应测量系统。
An automatic measuring system for the relative spectral response of IR detectors by using Fourier Transform Infrared (FTIR) Spectrometer bas been developed.
本文提出了一种利用离散付立叶反变换(IDFT)技术完成天线的时域近场测量的方法。
This paper describes a new method which USES IDFT (Inverse Discrete Fourier Transform) technique to do time domain near field measurement for antenna.
用付立叶光学原理，从理论与实践讨论了二维付立叶交换光学系统的空间带宽积的物理意义。
The Spatial -Band width product of 2-D Fourier transform optics system has been discussed dinal in this paper.
根据SPWM的基本原理与付立叶级数理论，建立了SPWM电压型逆变器输出波形的数学模型。
Based on SPWM basic principle and Fourier series theory, the mathematical model of output waveform of SPWM voltage source inverter is built.
试验结果表明：付立叶级数滤波法是一种行之有效的方法，并便利于用调制传递函数评价影象质量。
The results show that Fourier Series Smoothing method is not only an efficient method, but also is easy to estimate image quality using modulation transfer function.
采用付立叶谐波分析的方法把气隙磁密分解为空间基波和一系列谐波，进而计算出气隙磁场波形特征系数。
The Fourier analysis method is applied to decompose the air-gap magnetic density into the basic wave and a series of harmonic and wave shape eigen coefficient of air-gap magnetic field are calculated.
利用付立叶逆变换，给出了半正弦脉冲激励下桩顶速度时域响应半解析解。分析了主要参数对响应的影响。
Then, a semi-analytical solution for the velocity response of the pile subjected to a semi-sine wave exciting force was derived by using invert Fourier transform.
本文应用快速付立叶变换（FFT）计算分析了冲击发生器与分压器之间的相互作用对全波波头时间测量的影响。
This paper deals with the influence of impulse generating and measuring system on the measurement of lightning impulse front time by Fast Fourier Transformation (FFT).
提出了一种改进的快速付立叶变换(MFFT)的计算方法，在采样的持续时间不是信号周期整数倍的条件下，能够准确地提供此信号中各周期分量的特性。
Anew approach, named Modified Fast Fourier Transform (MFFT), is proposed to analyze the components of a periodic signal when sampling duration is not equal to an integer multiple of the fundamentals.
提出了一种改进的快速付立叶变换(MFFT)的计算方法，在采样的持续时间不是信号周期整数倍的条件下，能够准确地提供此信号中各周期分量的特性。
Anew approach, named Modified Fast Fourier Transform (MFFT), is proposed to analyze the components of a periodic signal when sampling duration is not equal to an integer multiple of the fundamentals.
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