菲涅尔

在固体表面上菲涅尔阵列可实现聚焦声束的B扫描。

The B-scanning of focused acouStic beam in solid by a Fresnel array is realized .

菲涅尔数字全息的分辨率由CCD的孔径尺寸决定；

The resolving power of Fresnel digital holography is defined by the aperture of the CCD ;

用反应离子刻蚀技术制作Ge菲涅尔微透镜列阵

Make of ge fresnel microlens arrays using reaction ion etching technology

该测量仪由近红外LED光源、窄带干涉滤光片、菲涅尔透镜、硅光电池检测器、单片机系统及校准模型等组成。

The apparatus is made up of NIR LED , interference filter , lens , Si photronic detector , microprocessor system and calibration model .

但传统LED受制于全内反射、菲涅尔效应等影响，发光效率较低。

However , the conventional LED has a very low emitting efficiency under the influence of the total internal reflection and Fresnel diffraction effect .

作者针对全息图记录中低的CCD分辨率，合理地分析了实验条件，完成了应用CCD直接记录菲涅尔全息图的实验设计。

After analyzing the experiment , the author completes designing the experiment in which the Fresnel hologram is recorded with CCD .

结果表明，在矩形等间隔抽样的情形下，菲涅尔数字全息的脉冲响应是由CCD有限大小的孔径衍射斑调制的矩形函数；

The results show : the impulse response is a rectangle function modulated by diffraction factor of the aperture defined by the CCD ;

仪器由LED（LightEmittingdiode）光源、窄带干涉滤光片、菲涅尔透镜、光电转换检测器、单片机系统等组成。

The apparatus is made up of light emitting diode ( LED ) , interference filter , lens , opto-electronic transformation detector , microprocessor system .

研究表明，平顶光束的M2因子仅由其阶数M确定，其聚焦特性与阶数M以及系统的菲涅尔数N等有关。

The results have shown that the M ~ 2-factor is only decided by the order M , the focusing properties relate to the order M and the Fresnel number N of the system .

利用该方法制作了菲涅尔透镜、Dammann光栅和闪耀光栅等二元光学元件，取得了较好的效果。

Fresnel lens , Dammann gratings and blazed gratings were manufactured by this method .

莫尔条纹是由LCD、菲涅尔透镜和微结构透镜等周期性结构的层叠引起的，对于设计高质量的LCD背投影屏幕至关重要。

Moire pattern caused by the cascade of periodic structures of LCD , Fresnel lens , and Lenticular lens , etc. is a key concern in designing a high quality LCD rear projection screen .

由于GaN材料和空气之间大的折射率差异，使得大部分光在分界面处产生全内反射和菲涅尔反射而陷落在材料中。

Because the refractive index difference is large between the GaN material and air , most of light are collapsed into GaN materials by the total internal reflection and the Fresnel reflection .

本文根据菲涅尔衍射理论，讨论了平面波照明时，两方向周期dx≠dy的正交光栅的Talbot效应。

In this paper , Talbot effect of grid grating under plane wave illumi - nation when periods d_xd_y is discussed , which is done on the basis of Fresnel diffraction theory .

采用甲基丙烯酸甲酯为主单体，丙烯酸甲酯为共聚单体，利用60Coγ射线辐射聚合技术制备菲涅尔透镜。

With methyl methacrylate as main monomer and methyl acrylate as copolymer monomer , fresnel lens were prepared by 60Co γ - ray radiation polymerization technology .

实验结果表明，基于TFT-LCD的菲涅尔波带片生成的中空光束具有实时可调、快捷和精确等优点。

The experimental result shows that the hollow beam generated from the Fresnel Zone Plate based on a TFT-LCD has the advantages of real-time adjustability , simplicity and accuracy .

利用Matlab对菲涅尔平行光直边衍射问题作了定量的分析，计算了幕上直边挡板边缘处的相对光强及衍射光能到达阴影处的极限坐标；

The problem of Fresnel parallel lights straight-edge diffraction is analysed quantitatively by using Matlab tool . The relative light intensity distributed on the boundary of straight-edge baffle in the viewing screen and the limit coordinate that diffraction light can reach to the shadow are calculated .

我们提出并讨论了在X射线波段与传统菲涅尔波带片的比较，并通过数值模拟指出聚光镜的衍射效率是由波带片结构和材料以及X射线的能量共同决定。

We present and discuss the comparison in the X-ray region with a normal condenser zone plate and a numerical simulation that points out that the efficiency of the condenser depends by the structure and the material of the zone plate , and by the energy . 5 .

研究表明，当有相同的M2因子但束宽不同的平顶高斯光束和超高斯光束通过光阑效应可忽略ABCD光学系统传输时，在广义菲涅尔数F相等处有相似的光强分布。

It is shown that two FGB and SGB with the same M 2-factor but different waist width exhibit similar intensity distributions at the position of the equal generalized Fresnel number , as they propagate through an unapertured ABCD optical system .

借助广义惠更斯－菲涅尔衍射积分（即Coffins公式）推导出HermiteGaussian光束（H&G光束）在无光阑限制下的相对焦移和相对光强增量的解析表达式，并作了分析。

Closed-form expressions for the relative intensity excess and focal shift of Hermite-Gaussian beams focused by an unaperture lens have been derived and analyzed by means of the generalized Huygens-Fresnel diffraction integral ( or called coffins formula ) .

研究结果发现，当非线性相移较大时，传统Z扫描理论的计算易出现振荡，而菲涅尔衍射模型则无此缺陷，可用于不同相移情况下的Z扫描实验。

It was showed that , when the phase shift was large , the irregular oscillation easily appeared in the Z-scan signal simulated by the conventional theory . However , the diffraction model could be applied to the analysis of Z-scan experiments for different nonlinear phase shifts .

利用惠更斯-菲涅尔衍射积分公式导出了部分相干平顶高斯光束（PCFGB）通过ABCD光学系统的传输公式。

The propagation formula of the cross-spectral density of partially coherent flattened Gaussian Beam ( PCFGB ) through ABCD optical system was derived using Huygens-Fresnel diffraction integral formula .

球面波照射下Ronchi光栅的菲涅尔衍射及计算机模拟一种用于均匀照明的衍射光学元件设计的快速模拟退火法

Analysis and Simulation of the Plural Amplitude and Distribution of Optical Intensity about Fresnel Diffraction of Ronchi Grating on Spherical Wave A Fast SA Algorithm for the Design of DOE for Uniform Illumination

接着，建立了人体目标穿过经过菲涅尔透镜阵列调制过的热释电红外传感器阵列的目标模型，并利用短时傅里叶变换（STFT）对仿真信号模型进行了预处理。

Secondly , we established the target model while human targets are walking through the Fresnel fiber array modulated pyroelectric infrared sensor array and preliminary processing of the simulated signal model using the short-time Fourier transform ( STFT ) .

基于广义惠更斯-菲涅尔原理，并利用维格纳分布函数，推导出了受光阑限制的振幅调制和相位畸变光束在大气湍流中传输的瑞利区间ZR和M2因子的解析表达式。

Based on the extended Huygens-Fresnel principle , the closed-form expressions for the Rayleigh range zr and the M2-factor of truncated laser beams with amplitude modulations ( AMs ) and phase fluctuations ( PFs ) in turbulence are derived by using the Wigner distribution function ( WDF ) .

方法从广义惠更斯-菲涅尔衍射积分方程（Collins公式）出发，证明了光强分布为高斯型分布的部分相干光束经透镜聚焦，在几何焦点附近的光强分布强烈依赖于部分相干光束的空间相干度。

Methods Starting from the generalized Huygens-Fresnel diffraction integral ( Collins formula ), it is demonstrated that when a partially coherent beam with a Gaussian intensity distribution is focused by a lens , the intensity distribution near geometrical focus is strongly dependent upon the spatial coherence .

本文以现有的光源模型为基础，利用相干光学结合湍流介质传输过程中的惠更斯-菲涅尔原理，推导出大气信道中光波的偏振度（DOP）数学表示。

In this paper we take the existing light source model as an example , use coherent optics and diffraction theory which in turbulent media and the Huygens-Fresnel principle to induce the mathematical expression of degree of polarization ( DOP ) which propagation in atmosphere .

对于光时域反射计（OTDR）技术，分析了影响光纤传输特性的因素及瑞利散射和菲涅尔反射的原理；研究了OTDR的工作原理及组成，同时讨论了OTDR的主要技术指标。

For the optical time domain reflectometer ( OTDR ), the factors that impact optical fiber transmission characteristics and the principles of Rayleigh scattering and Fresnel reflection are analyzed . The principle and configuation of OTDR are studied , and the main technical specifications of OTDR are discussed .

结果表明，采用辐射聚合方法制备菲涅尔透镜时，选择适宜的辐射剂量（35kGy）和辐射剂量率（84.40Gy/min），所制备的菲涅尔透镜具有优异的光学性能。

The results showed that fresnel lens prepared by radiation means have excellent optical performance , when choosing appropriate radiation dose ( 35kGy ) and radiation dose rate ( 84.40Gy / min ) .

整个流程所包括的四个环节依次为：计算相位图、设计光刻版图、两步湿法腐蚀工艺及性能测试。首先以菲涅尔衍射理论为基础，采用G-S算法计算所需的相位分布。

The whole technological flow consists of four key steps including : calculation phase distribution map , designing photomask , dual-step wet etching , and performance measurements . Firstly , based on the Fresnel theory , the phase distribution patterns are calculated by G-S algorithm .

用菲涅尔平板天线实现相干来波方向的估计

Estimation of direction-of-arrival of coherent signals using Fresnel zone plate antenna