离焦量

采用自制状态调整装置进行真空环境下激光铣削试验，研究了激光输出功率、离焦量、扫描方向对铣削凹槽的宽度和铣削质量的影响规律。

Laser milling vacuum environmental experiments mainly studied the law of width and milling topography of groove influenced with laser output power , defocus , scanning direction .

探讨离焦量和倾斜量的调整对近柱面检测装置的优化作用，以及此类优化的局限性。

The optimizations of the testing sets ' arrangements through the adjustment on defocus and tilts are discussed , and the shortcomings of these optimizations are discussed too .

空气中离焦量对激光诱导Cu等离子体光谱的影响

Influence of Defocusing Distance on the Laser-Induced Cu Plasma Spectra in Air

阐述了预放大数字全息显微的基本原理，就CCD的离焦量以及系统分辨率进行了理论分析。

The basic principle of digital holographic microscopy is discussed , and then the defocusing amount and system resolution are theoretically analyzed .

Mg烧损率随着焊接电流和脉宽的增加而减少；随着焊接速度和离焦量的增加而增加。

Mg loss rate decreases with the increase of welding current and pulse duration . While it increases with the increase of welding speed and defocusing distance .

采用光线追迹原理，分析IOL前移时眼睛光学系统离焦量变化，计算调节力改变。

Ray-tracing method was adopted to calculate optical defocus and analyze pseudophakic accommodation induced by IOL forward movements .

分析表明，只需代入相应的离焦量，阴极透镜的诸ETF公式还可以用来表示双平面近贴系统的ETF。

It has been proved that by substituting the corresponding off-focus parameter the above formulas can be-used to describe the ETF of proximity system .

通过在316L不锈钢基材上进行激光熔覆，研究了低阶模CO2激光熔覆功率和离焦量对熔覆层形貌和质量影响。

The effects of laser power and defocusing distance on the morphology and quality of laser cladding layer have been studied using low order mode CO2 laser on 316L stainless steel .

因此，通过调节离焦量，低阶模CO2激光熔覆可以得到界面平整、熔合良好的熔覆层，采用低阶模CO2激光进行熔覆是可行的。

Therefore , the cladding layer using low mode CO2 laser with good fusion and leveling interface can be obtained by regulating defocusing distance . It is entirely possible for laser cladding using low order mode CO2 laser .

通过进行单道单层激光熔覆试验，利用本文开发的CCD实时检测系统研究了激光熔覆工艺中扫描速度、送粉速率、离焦量对熔池宽度的影响。

With this real-time detection system based on CCD , effects of process parameters such as scanning speed , powder feed rate and defocus on the width of the melt pool in the single-pass laser cladding are investigated . 6 .

声光调Q脉冲激光的功率密度是一个总参数，激光平均功率、脉冲重复频率和离焦量对修锐效果的影响均可通过它来体现。

Power density of AO Q-switched Nd : YAG pulse laser is the total parameter in the laser dressing process . The influences of laser average power , laser pulse repetition frequency and focal distances on dressing effect can reflect through laser power density .

以不锈钢SUS304作为试验对象，分别研究了焊接速度、散焦离焦量、激光功率和保护气体等工艺参数以及活性剂和活性元素硫对不锈钢YAG激光焊焊缝成形的影响。

The effects of welding speed , defocusing distance , laser power , shielding gas , activating flux and activating elements on weld shape in YAG laser welding of SUS304 stainless steel was studied .

在激光功率为3kW，侧吹保护气角度为35°条件下，通过优化焊接速度、侧吹保护气流量和离焦量等参量可以得到最佳焊缝质量。

The high-quality of weld seam with constant ( 3 kW ) laser power and 35 ° angle of side-blow shielding gas can be obtained by optimizing welding velocity , flow rate of shielding gas , defocusing distance and other parameters .

激光扩束器离焦量的多元函数极值解法

Multivariate Function Extreme Value Based Calculations of the Defocused Amount of Expending Telescope

离焦量对等离子体冲击波力学效应的影响

Influence of Defocusing Distance on Mechanical Effect of Plasma Shock Wave Induced by Laser

离焦量和非单色光对二元相位光栅泰伯像的影响

The Influence of Defocus Length and Quasimonochromatic Line on Talbot Image with Binary Phase Gratings

离焦量误差对相位差法波前重构的影响

The Effect of Uncertainty in Defocus Distance on the Wave-front Reconstruction with the Phase-diversity Algorithm

精心选择光学元件和离焦量是实现准傅里叶-夫琅和费全息术的关键。

The key to realize the method is meticulous selection of optical elements and off-focus quantity .

准分子激光直写加工形状与离焦量关系的研究

On the Relationship Between Target Ubiety Relative to Laser Focus and Yielded Shape in Excimer Laser Direct Micro-fabrication

利用平面波衍射的角谱理论，分析计算了二元相位光栅衍射光场的空间分布，特别讨论了离焦量和非单色光对泰伯像的影响。

The spatial distribution of Fresnel diffraction field of binary phase gratings is analyzed by using RSD theory .

当离焦量水平为0时，熔宽达到最小值。

The width of penetration would reach the minimum value when the level of clearance was equal to 0 .

结果表明：只有采用合适的离焦量，才有可能获得较好的焊缝成形质量。

Experimental results showed that reasonable defocusing value should be adopted in order to get better weld seam shaping quality .

通过数值仿真和实验的方法，分析猫眼回波强度与离焦量和探测光束参数关系。

By numerical simulation and experiment , the relationships of cat-eye echo , focal shift and detection beam parameters are analyzed .

分析了全息图尺寸及其记录的空间频带宽度与离焦量的关系；

Analyzed is the dependence of the defocusing quantity on the hologram size and the spatial frequency bandwidth of the object .

当离焦量为零时，干涉图上或者无条纹，或者条纹有确定的方向。

In the interferogram the fringes either do not appear or appear and have the determined direction when the defocusing is zero .

激光平均功率增加、脉冲重复频率减小、离焦量减小，则脉冲功率密度增加，凹坑深度增加。

With average laser power increasing , pulse repetition frequency and focal distances decrease , pulse power density and crater depth increases .

研究了激光焊接输出功率、焊接速度、离焦量等工艺参数对焊接深度及焊接宽度的影响。

The effects of laser power ? speed and defocusing parameter on welding depth and width have been studied in the experiment .

从理论上，详细推导了双光纤离焦量探测公式，并讨论了调焦搜索方法。

In theory , infer the dual fiber detection of defocus amount formula in detail , and discusses the focusing search method .

离焦量决定着熔池的形状，保护气体的气嘴距离工件表面的高度也影响着焊缝质量。

Defocusing amount depended the shape of the pool , the distance between protective gas and workpiece also affected the welding quality .

数值研究了非相干光反馈时半导体激光器输出功率随反馈系数的变化关系以及待测物体离焦量与反馈系数的关系。

Relationships between output power of laser diode and optical feedback coefficient , optical feedback coefficient and defocusing amount are numerically investigated .