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.
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.
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.
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.
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.
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.
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.
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.
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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