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.
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.
研究光学系统离焦量和探测激光束参数对猫眼光学系统回波强度的影响。
The influences of the optical system focal shift and the detection laser beam parameters on the echo of cat-eye optical system are studied.
同时得出了不同离焦量横截面上中空环形光斑的大小和占空比之间的关系。
At the same time we can get the relationship between hollow circular laser beam and duty circle at different defocusing cross section.
文中还对锐聚焦系统给出了最佳归一化离焦量的表达式和相应的ETF近似公式。
For sharp-focusing system, the expressions for the position of optimum image plane and its corresponding ETF are also given.
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.
试验建立起了凹坑深度与脉冲功率密度、激光平均功率、脉冲重复频率和离焦量之间的关系曲线。
Crater depth versus pulse power density, average laser power, pulse repetition frequency and focal distances are built up through experiment.
实验结果表明：当载气流量增大、加热温度增高、饱和煅后焦量减少，都有利于再生效率的提高。
The experiments showed that more loaded gas velocity, higher temperature and less saturated calcined-coke did well to the increase of the regeneration efficiency.
研究了激光光斑直径及离焦量、切割速度、激光功率等工艺参数对齿轮切缝宽度及加工质量的影响。
The effects on kerf width and quality made by laser facula diameter, focal point position, cutting speed, laser power and other technological parameters were studied.
通过分析点扩散函数、斯特列比和离焦量的关系来评价三种不同掩模板对光学系统成像质量的影响。
Point spread function (PSF) and Strehl ratio (SR) are used to evaluate the imaging quality of the system with different defocus parameters.
进一步分析发现激光功率对接头强度的影响最大，焊接速度的影响仅次于激光功率，离焦量的影响最小。
And it is observed that laser power is the ultimate affection of joint strength, the defocusing amount is the weak influence, and the welding speed between the former affection factor.
为获得较高的连接强度，宜使峰值功率与离焦量适当配合，实现深熔焊模式进行焊接，而脉冲宽度不宜太大。
To gain good joint strength, the pulse peak power and defocusing distance should be chosen appropriately to implement welding in keyhole mode, and moreover, pulse duration should not be too long.
目前实时检测的内容主要有焊接过程的稳定性、装配质量、离焦量、焊缝熔深和表面形貌、熔池与小孔的形态等。
The present research mainly focuses on detecting the processing stability, assembly quality, defocusing, weld penetration, weld shape, pool and keyhole, etc.
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.
对测试仪的光学系统的波像差进行了估算，选择了合适的离焦量来补偿波像差，并对系统离焦后的像差进行了验算。
Estimate the wavefront error of the whole optical system, and select a proper defocus length to improve the wavefront error, and then check the system's aberration after defocus.
通过实验，确定了激光功率、离焦量和扫描速度对清洗效果的影响，并最终确定激光清洗时的损伤阈值和清洗阈值。
The effects of the laser power, defocusing amount and the scanning velocity tO the cleaning results are got by experiments; the cleaning threshold and the damage threshold are obtained.
三种原料方案的试验结果表明，以催化裂化轻柴油为原料，低凝柴油的液体收率最高，催化剂生焦量最小，运行周期最长。
The test result showed that among the three test feeds, FCC LCO feedstock had the highest liquid yield and lowest coke deposition as well as longest running cycle.
前者试验获得了一定激光功率和离焦量条件下两组焊接速度和送丝速度的匹配关系，并发现填充焊丝的加入对焊缝咬边现象确有改善；
Two groups of matching relation of the weld speed and the wire feed rate were found in a condition of invariable laser power and focus position.
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.
如果我们测量热力学量会发现自由焓的变化,等于4千焦，正4千焦。，delta，H，is，4，kiloJoules，，plus，4，kiloJoules。,熵增dS是45焦耳每开尔文。
If we measure the thermodynamics, we discover that dH Delta S is 45 joules per Kelvin.
石油焦市场前景较好，未来需求量的增加主要集中在炼铝行业。
Demand for petroleum coke will increase continuously and mainly in the field of aluminum industry.
我国目前存在着焦丁回收地点不当、回收量不足及焦丁与矿石混匀方法不完善等方面的问题。
Now there are some problems such as unsuitable recovering location, insufficient recovering quantity, imperfect ore-coke nut mixing method and so on.
石油焦渣油浆的浓度、油焦浆的加热温度、负荷和氧量对其燃烧效率有很大影响。
The parameters such as POS concentration, POS heating temperature, fuel load and oxygen content have high influence on combustion efficiency.
图像熵和高阶累积量不需要参考图像，因此可以在实际的离焦分析中广泛应用。
The two parameters have good application in practical defocus analysis due to their independence of reference image.
围绕光纤耦合效率相关的量：激光模式、发散角、数值孔径、焦斑直径、精密光纤耦合器等问题进行了讨论；
The quantity in relation to the coupling efficiency of an optical fiber:lasing mode, divergence angle, numerical aperture, focal diameter and precision optical fiber coupler are discussed.
用这种煤沥青制得的沥青焦，其抗氧化性提高，在活化剂加入量适宜时沥青焦的导电性能也有所提高。
Both the oxidation resistance and the electrical conductivity of the pitch coke can be improved when a suitable amount of activating agent is added in the coal-tar pitch.
辽河催化裂化澄清油中芳烃含量高、沥青质含量低、分子量分布窄，是生产针状焦的优质原料，但其所含的灰分对澄清油的加工利用有着较大影响。
Liaohe FCCDO is a better raw material to produce needle coke because it has a high content of aromatics, low content of asphalt and narrow distribution of molecular weight.
在确保焦炭质量的前提下，得到焦油渣、焦粉及活性污泥分别替代肥煤、瘦煤、肥煤的最佳添加量依次为2.0%、2.0%、2.0%。
The best substitution of Fat coal, Lean coal and Fat coal for tar slag, coke powder and active sludge were 2.0%, 2.0%, 2.0% on the premise of guaranteeing the quality of coke.
影响离轴抛物镜准直特性的主要因素有离轴量，有效孔径和焦面出射点的位置。
The basic factors affecting collimating characteristic are off-axis magnitude, effective aperture and emission position on the focal plane of off-axis parabolic mirror.
影响离轴抛物镜准直特性的主要因素有离轴量，有效孔径和焦面出射点的位置。
The basic factors affecting collimating characteristic are off-axis magnitude, effective aperture and emission position on the focal plane of off-axis parabolic mirror.
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