共查询到18条相似文献，搜索用时 234 毫秒
1.
利用激光除漆过程中会产生声音信号,通过实验的方法,用声音记录装置记录下激光除漆过程中的声波信息,并且对采集到的声波信息分别进行了时域和频域分析.从声音信号的时域分析可以得到漆层被清洗前后声波信号强度没有显著变化,说明短脉冲激光干式除漆的主要作用原理是基底振动效应,而不是烧蚀效应.从声音信号的频域分析可以得到漆层被清除前后谱峰位置有明显的不同,依据谱峰的变化情况可以辨别漆层是否被清洗干净,为激光除漆提供了一种新的判断依据. 相似文献
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利用波长532 nm、脉宽10 ns的短脉冲激光在不同激光能量下对甲醛树脂进行了烧蚀推进研究.通过测量激光烧蚀后的靶动量及质量损失,获得激光与甲醛树脂相互作用的动量耦合系数和比冲. 相似文献
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本文详细叙述了激光清洗技术的产生背景、激光清洗技术的原理,以及国内外该技术的发展状况。通过本文的分析与阐述,使人们能够充分认识到激光清洗技术的优点,更新传统的清洗理念,从而使激光清洗技术能够得到更为广泛的关注与应用推广。 相似文献
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通过对光致大气击穿过程中的电子连续性方程进行分析,并利用Matlab中的ode45求解器建立了等离子体形成过程中电子密度随时间演化的理论模型。利用该模型计算得到了同一脉宽、不同波长的作用激光击穿大气的阈值,计算得到的结果与文献报道的实验结果吻合得较好,从而验证了这一模型的正确性。通过该模型数值模拟了调Q-Nd:YAG激光击穿大气过程中电子密度的时间演化曲线,并对得到的电子密度演化曲线进行了讨论。结果表明:光致大气击穿过程前期多光子电离占主导地位;中期雪崩电离占主导地位;后期损耗因素占主导地位。 相似文献
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建立一维半导体Ge的激光烧蚀模型,对波长为248nm,脉宽为17ns,峰值功率密度为4×108w/cm2的KrF脉冲激光在1000torr(1torr=133.32pa)氦气环境下烧蚀晶体Ge及产生等离子体的过程进行了数值模拟,并对计算结果进行分析比较.结果表明在惰性气体环境下,气压在1torr和1000torr之间变化对等离子体屏蔽现象的出现几乎不产生影响;背景气压的增大抑制了粒子的扩散,使等离子体的膨胀速度减小,限制了其膨胀的空间. 相似文献
7.
朱慧敏 《漯河职业技术学院学报》2010,9(5):19-20
传动角是度量平面四杆机构传力性能好坏的一个重要指标,为此在分析机构的传力性能时,必须探究机构的最小传动角,以确保机构的传力性能。文章用数学方法推导论证了不等长双曲柄机构中最小传动角的条件,同时分别通过对短曲柄和长曲柄作主动件两种情况的分析,得出短曲柄作主动件比长曲柄作主动件时的最小传动角更小,从而为双曲柄机构如何得到最小传动角提供了设计思路。 相似文献
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利用华之尊HZZ-M300型光纤激光打标设备对白、黄、红和黑4种基底颜色的ABS树脂进行打标,研究不同打标功率(p)和打标速度(v)等打标参数下,激光打标后的效果和质量,并用超景深显微镜观察打标后的微观结构。实验结果表明：不同颜色基底的ABS材料,其激光打标性能不同,基底颜色较深的,其激光打标性能较好,较容易获得好的打标效果。因此,在实际生产应用中,应尽量选用深色基底的材料。同时,实验也得到了不同颜色基底的ABS材料的光纤激光打标工艺参数,能为它们的高效、高质量光纤激光打标提供一定的借鉴。 相似文献
10.
李芳菊 《渭南师范学院学报》2013,28(9)
利用液体表面声波(Surface Acoustic Waves,SAW)对激光的衍射效应,设计了一套设备简单、操作方便、测量成本低的低频液体表面波激光衍射系统,并对不同温度下水和NaCl溶液的表面张力系数进行了测量,得到了表面张力系数和温度之间的解析关系.实验结果表明表面张力系数和温度之间呈近似线性关系,并且相关系数大于0.99,说明该实验系统能够满足表面张力系数测量和研究的要求. 相似文献
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对短脉冲光纤激光器锁模的物理机制加以理论研究，由光脉冲传输方程理论推证得出光纤激光器和主动锁模激光器的理论模型，从而得出孤子效应在主动锁模技术中影响锁模的稳定性。 相似文献
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A series of ablation experiments on silicon surface by femtosecond laser system of 775 nm and 150 fs duration pulses were carried out.The morphological characteristics and the associated effect in the ablation were tested by atomic force microscope (AFM),scanning electron microscope (SEM),focused ion beam (FIB),and the optic microscope.The single pulse threshold can be obtained directly.For the multiple pulses,the ablation threshold varies with the number of pulses applied to the surface due to the incubation effect.By analyzing the experimental data,the thresholds of laser fluences under various laser pulse numbers were obtained,and the relationships between ablation area and laser energy and laser pulse number were concluded.Meanwhile,the periodic ripple structure on silicon surface was found.Under the condition of certain laser power,the number of laser pulse can influence the formation of ripples. 相似文献
13.
Introducing a superintense femtosecond laser pulse in the muon-catalyzed fusion （μCF） target, taking the mixture after fusion reaction as a overdense plasma, and based on the Newton classical equations, the paper studies the movement of muon in the plasma. Muon drift along the direction of laser propagation remains even at the end of the laser pulse. At the peak laser intensity of 1021 W/cm^2, muon goes from the skin layer into field-free matter in a short time much less than the pulse duration, before the laser pulse reaches its peak value. According to the calculated results, when the laser intensity reaches 1023 W/cm^2, the relativistic muon drift should be considered. Influence of the laser on other particles in the plasma is small. Hence, this method can avoid muon sticking to alpha effectively and reduce muon-loss probability in μCF： 相似文献
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Titaniumalloyisakindofdesirablemetallicbioma terialforimplantingandrepairingbodyhardtissuesduetoitsbetterbiocompatibilityandmechanicalproper ties[1,2 ] .However ,itcansuffercertaindisadvantages ,suchaspoorosteoinductive ,andlowcorrosivewearresis tance .So ,itisveryimportanttoimprovethejointprop ertiesbetweentitaniumalloyandhumanbody .Hydrox yapatite(HAP)isknowntobebiocompatibleandtoformadirectbondwiththeneighboringbonesduetoitscrys tallographicalandchemicalsimilaritywithvariouscalci fiedtissu… 相似文献
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超短超强激光与物质相互作用产生的K-alpha线辐射,有准单能、发射区域小、时间短等优点,具有广泛的应用前景。介绍了超短超强激光辐照靶物质产生K-alpha源的基本原理及其主要研究内容,讨论了该领域的研究热点。 相似文献
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The interactions of laser field with plasma are studied by using the analog model of gravity. The interactions of laser field with plasma are regarded as an equivalent effective geometry. An effective metric for a plasma electron is developed. Validity of the metric is confirmed in the limit of non-relativity. The three-dimensional equation of motion for a plasma electron is derived from the general covariant equation of motion. The ponderomotive force and the Abraham＇s force are directly obtained from the three-dimensional equation. 相似文献
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针对单次自相关方法只能测量一个脉宽的缺点,提出一种改进的单次相关方法测量超短激光脉冲全空域中不同空间位置的时空特性.通过实验测量了钛宝石激光器输出飞秒激光脉冲的时空特性,结果表明飞秒激光脉冲全空域中不同位置的复杂空间特性得以精密测量;不同空间位置的时间脉宽不同,它们服从高斯分布;当飞秒激光脉冲经过二硫化碳非线性介质传输后,随着输入平均功率的增加,同一空间位置的时间脉宽呈现慢慢变窄的趋势.实验结果验证了所提方法可以有效地测量超短激光脉冲全空域中不同空间位置的时空特性. 相似文献
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The femtosecond optical trapping capability and the effect of femtosecond laser pulses on cell viability were studied. The
maximum lateral velocity at which the particles just failed to be trapped, together with the measured average trapping power,
were used to calculate the lateral trapping force (Q-value). The viability of the cells after femtosecond laser trapping was ascertained by vital staining. Measurement of the
Q-values shows that femtosecond optical tweezers are just as effective as continuous wave optical tweezers. The experiments
demonstrate that there is a critical limit for exposure time at each corresponding laser power of femtosecond optical tweezers,
and femtosecond laser tweezers are safe for optical trapping at low power with short exposure time. 相似文献