fourier transform的例句大全

The new resin was characterized by Fourier transform infrared spectroscopy ( FT-IR), X-ray photoelectron spectroscopy ( XPS) and the specific surface area and pore size analyzer. The results implied that the tetrazolyl group was connected to the resin successfully. 2.

采用红外、X射线光电子能谱仪和比表面积及孔径分析仪对其结构进行表征，结果表明四唑功能基已被成功地接到树脂上。

The paper mainly researched in sampling and storing echo signal of the millimeter-wave frequency stepping radar and signal processing. The echo signal is used for the Inverse Fast Fourier Transform to obtain the target one-dimensional distance diagram, and gain the target distance, and so on.

本文主要研究毫米波频率步进雷达目标回波信号的采集存储和信号处理，对目标回波信号采用IFFT脉冲压缩处理得到目标一维距离成像，提取目标距离等信息，并利用MFC编程实现这一过程。

When designing the monitoring system, the author carries out simultaneously theoretical analysis and improvement on conventional radix 2 Fast Fourier Transform ( FFT), Split Radix FFT ( SRFFT), our algorithms can save 33% multiplications for DFT approximately as compared to the traditional algorithms.

基于分裂基的SRFFT算法实现离散傅立叶变换，较传统基2FFT算法节省33%的运算量，可提高运算效率。

We then emphasize from the theoretical principle and the experimental realization the efficiency of the quantum factorization by using the remainder function and discrete Fourier transform.

并着重从理论原理和实验实现这两方面说明利用余因子函数和离散傅里叶变换使这种量子算法对因子分解是有效的。

The effect of NiO content on the basicity of catalyst was investigated by using H2 TPD ( temperature programmed desorption), DRIFTS ( diffuse reflectance infrared Fourier transform spectroscopy), and CO2 TPD. The catalytic performance was tested and the amount of coke deposition was measured.

用H2-TPD（程序升温脱附），DRIFTS（漫反射红外傅立叶变换光谱），CO2-TPD等方法考察了NiO的含量对催化剂表面碱性的影响，并和反应稳定性以及抗积碳性能相关联。

Analysis on Texture Discrimination Performance of Moments of Local Fourier Transform Coefficients

局部傅里叶变换系数各阶矩的纹理鉴别性能分析

Fractional Fourier transform of spherical refracting system and compound thick lens

球面折射系统和复合厚透镜的分数傅里叶变换

Fourier Transform of a Thick Lens in the Illumination of Gaussian Beam

高斯光束照明下厚透镜的付里叶变换

According to the Fourier transform relationship exists between the array factor and the element excitations in thinned array, an iterative fast Fourier transform algorithm based on the classic density-tapered array optimization design is presented and the detailed theory of the method is discussed. 3.

根据稀疏阵列中阵列因子与阵元激励之间存在的傅里叶变换关系，在经典密度加权阵列设计方法的基础上，完善了一种基于迭代FFT算法的阵列优化方法，并详细阐述了其原理。

The Fourier transform spectrum of the temporal output intensity has provided important informations for the instability behaviour analysis of tho system.

输出强度的快速傅里叶变换谱为此系统的非稳特性分析提供了重要信息。

Study of the Automatic Measurement for Three-dimensional Shapes of Fabric Appearance with Two-dimensional Fourier Transform Profilometry

基于二维傅立叶变换轮廓法的织物表面形态测量研究

In Fourier transform profilometry ( FTP), zero frequency of the captured patterns influences the measuring range and measuring precision, and even makes the reconstruction of three-dimensional surface incorrect.

在实际傅里叶变换轮廓术测量中，获取条纹图的零频分量对傅里叶变换轮廓术的测量精度和测量范围有很大影响，甚至妨碍三维面形的正确重建。

Most magnetotelluric data processing methods make the Fourier transform of a segment record to get a power spectrum then to solve for tensor impedance element.

大地电磁资料处理方法大多数都是对一段记录做傅氏变换，构成功率谱后再求张量阻抗元素。

Use high precision zero flux through current sensors which fit the industrial environments to achieve the goal of measuring the end of the screen small current accurately, then use discrete Fourier transform to calculate the dielectric loss factor devices to achieve a capacitive device online monitoring system.

选用在工业环境下具有高精度零磁通穿芯式电流传感器，实现了末屏小电流的精确检测，并采用离散傅里叶变换计算出设备的介质损耗因数，实现了容性设备在线监测系统。

The determination of time discrimination and frequency discrimination and the selection of a window function in the short-term Fourier transform ( STFT) were discussed to analyze the vibrational signals from a high-pressure hydraulic pump unit.

对水泵机组振动信号分析中短时傅立叶变换的时间分辨率和频率分辨率的设定、窗函数的选取进行了研究。

This paper describes a new method which uses IDFT ( Inverse Discrete Fourier Transform) technique to do time domain near field measurement for antenna.

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。

Get the amplitude frequency characteristics of impulse response and aeroelastic coupling response by discrete Fourier transform of time domain response, then get the structural damping of blade and tower and the aeroelastic damping of blade based on half-power bandwidth method.

通过对时域响应进行离散傅里叶变换，得出脉冲响应与气弹耦合响应的幅频特性，然后基于半功率带宽法得出叶片与塔架的结构阻尼及叶片的气弹阻尼。

Data of complete time domain waveform is also needed in order to calculate accurate S-parameters of frequency domain via fast Fourier transform ( FFT).

而要通过FFT获得准确的频域散射参数，又必须得到完整的时域波形数据。

Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between windows.

频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。

Fractional Fourier transform and time-frequency filtering

分数阶Fourier变换与时频滤波