查询词典 Fresnel lens

Three LEDs biology light sources with different intensity for cell or tissue culture have been developed in the third part of this thesis. A concave lens to expand the beams of light, to focus the rays of light and an array of LEDs being set in the sphere connected with Fresnel lenses are three newly-designed in our systems.

实际测试数据表明：低强度光源输出的辐射照度范围为0.0021—0.9961(W／m~2)，在直径20mm的照射面积内所测辐射照度的标准偏差为0.02W／m~2(n=40，Mean：0.71 W／m~2)；中等强度光源输出的辐射照度范围为0.3579—11.2286(W／m~2)，在直径30mm照射面积内所测辐射照度的标准偏差为0.02W／m~2n=60，Mean：6.37 W／m~2；较高强度光源输出的辐射照度范围为17—110(W／m~2，在直径40mm照射面积内所测辐射照度的标准偏差为0.02W／m~2(n=80，Mean：71.54 W／m~2)。

It is demonstrated by theoretical analysis and computer calculation that the focus of Fresnel zone lens will change discretely as the depth of phase changes with integral times of 2?.

理论和模拟计算表明，当环带深度改变2p 的整数倍时，菲涅耳波带透镜的焦点将发生离散的变化。

Based on the Fresnel diffraction integral and the complex Gaussian expansion for the hard-edge aperture function, a simple and analytical expression for calculating the diffraction field distribution of an apertured lens is presented.

基于菲涅尔衍射积分和将硬边孔径函数展开成有限项复高斯级数方法推导出了计算透镜衍射光强分布的解析表达式。

Staring from Fresnel diffraction integral,we deduced the optical intensity distribution in the Fresnel zone of the diffraction field of the annular-aperture lens axicon.

从菲涅耳衍射积分公式出发，推导多色高斯光束被球差透镜衍射后光强分布的解析公式，进行数值模拟和物理分析。

By using Zernike polynomials to describe the wavefront distortion of beams, the propagation properties of the flattened Gaussian beams, super Gaussian beams, Gaussian beams and plane waves passing through an aberrated lens or an aberrated annular lens are studied based on the generalized Huygens-Fresnel diffraction integral.

以广义惠更斯—菲涅尔衍射理论为基础，采用Zernike多项式描述像差光束畸变波前相位，研究了平顶高斯光束、超高斯光束、高斯光束以及平面波通过像差透镜和环状像差透镜的传输。

In solid immersion lens microscopy systems with high numerical aperture, there always exists the aberration produced by Fresnel effects at the interface between SIL and the sample.

在高数值孔径的固体浸没透镜显微系统中，固体浸没透镜界面与样品之间的菲涅耳效应将产生象差，这一象差可能导致样品成像质量的下降。

Design of objective lens with reflective spherical fresnel zone plate.

应用反射型球面菲涅耳波带片的成像物镜设计。

Based on the defined effective Fresnel number of focused beams,the focusing of partially coherent beams through cylindrical aberrated lens was studied,and the simple formula of relative focal shift was derived.

华侨大学电子科学与技术系光学与光子学研究所，福建泉州 362021 华侨大学电子科学与技术系光学与光子学研究所，福建泉州 362021

"Refinements in lenses (e.g., the Fresnel lens) and reflectors made it possible to substantially increase the light's intensity ."

而利用透镜和反光镜的辅助设备可使灯光强度倍增。

The object for each of these lenslets is the image of the LED that would be formed by the Fresnel lens.

采用高亮度发光二极管，用菲涅尔透镜和柱透镜阵列使光线集中在用户眼睛上，大幅度提高图像亮度，由于左右眼看到的图像不一致，产生视差，形成立体感。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。