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激光诱导击穿光谱实验装置的参数优化研究 总被引:1,自引:0,他引:1
Zhang L Ma WG Yan XJ Li ZX Hu ZY Zhang YZ Wang L Dong L Yin WB Jia ST 《光谱学与光谱分析》2011,31(9):2355-2360
为了使激光诱导击穿光谱(LIBS)实验装置中的多个关键参数达到最优化设置,以便更好地服务于煤质分析,实验中对这些参数与煤粉等离子体中待测元素发射谱线信噪比间的关系进行了详细研究,并根据信噪比大小来进行最优化参数的选择.实验结果表明,对于本LIBS实验装置,其最优化参数设置是将激光脉冲能量设为120 mJ·Pulse-1... 相似文献
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演示实验是物理课堂教学中经常使用的教学手段,为使演示实验的利用达到课堂教学效果最优化,笔者从实验与教学环节、实验的启发性、实验与思维、实验与指导几个方面论述了这个问题。 相似文献
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针对高功率激光装置所需的大口径光学元件,进行了小工具数控抛光中频误差控制工艺研究。对数控加工过程中卷积效应对中频误差的影响进行分析,并建立了残余误差分析模型,对卷积效应所引入的残余误差进行定量分析。利用该模型对中频误差修正工艺参数进行了仿真分析,并进行了修正工艺参数实验验证,确定了全面匀滑最优化参数。在最优化工艺参数的基础上,针对大口径光学元件开展了数控抛光中频误差控制工艺实验验证,使400 mm口径平面窗口元件加工精度达到透射波前PV值为0.27,透射波前PSD1 RMS值为1.67 nm。该实验结果表明,通过400 mm口径平面窗口元件的中频PSD1控制技术研究,使窗口元件能够达到高功率激光装置对中频PSD1的指标要求。 相似文献
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随机并行梯度下降光束净化实验研究 总被引:10,自引:4,他引:6
利用自适应光学技术进行光束净化是高能激光系统中一项重要的研究内容.为实现光束净化系统的小型化和低成本,基于系统性能评价函数无模型最优化的波前畸变校正方法是适合的技术方案.就随机并行梯度下降(SPGD)最优化算法在光束净化系统中的应用展开研究.针对高能激光束常见的像差分布进行了SPGD波前校正的数值模拟,在此基础上构建了37单元自适应光学光束净化实验平台,讨论了双边扰动梯度估计和迭代增益系数自适应变化对算法收敛特性的影响.数值模拟与实验结果验证了SPGD算法对不同程度波前畸变的校正能力,表明了SPGD光束净化方案的可行性. 相似文献
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Analytical expressions for the impedance characteristics inherent to an optimum absorber are derived. The results of the laboratory experiment in which the simplest optimum absorber is constructed and investigated are presented, and the validity of the analytical relations obtained is confirmed. 相似文献
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针对异面腔四频差动激光陀螺(DILAG)工作模式不确定性和跳模对其性能的负面影响,提出了根据开机时腔体温度快速选择最优初始模的智能选模方法。分析了纵模阶数对DILAG的零偏和比例因子的影响以及跳模的危害,指出选择最优初始模是在现有基础上进一步提高DILAG性能的重要方法。通过温度实验做出了最优模相应的压电换能器(PZT)驱动电压随温度的变化曲线,为建立选模模型提供了基本依据。实验表明,智能选模使腔长控制系统加电后能快速稳定在最优初始模,减小了跳模几率,提高了腔长控制电路的鲁棒性和自适应性,对改善DILAG的性能、可靠性具有实用价值。 相似文献
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In order to improve the performance of the double-clad fiber laser, the optimum laser length needs to be estimated prior to the experiment. Previous expressions for the optimum length of fiber laser have been established under some assumptions, such as the output power without laser scattering loss and the pump power without reflection in the output-end. In this work, the issue of optimum laser length has been analyzed theoretically based on the strongly pumped fiber laser model. An extended expression for the optimum length of the linear cavity Yb3+-doped double-clad fiber laser is obtained. The respective effects of the laser scattering loss, the pump power, the Yb3+ dopant concentration, and the pump reflection on the optimum laser length are identified. 相似文献
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动态偏振模色散补偿的自适应算法及实现 总被引:6,自引:6,他引:0
基于研制成功的两级偏振模色散自适应补偿系统,提出对光传输系统中偏振模色散(PMD)自动搜索跟踪的补偿算法,该算法解决了偏振模色散补偿多自由度搜索中易于陷入局部极大值的问题.实验证明应用该算法制成的偏振模色散自适应补偿器性能优越,所能达到的性能参数为:全局补偿搜索时间78.77 ms,跟踪响应时间15.75 ms.另外,为了将研制的动态PMD补偿器得以实用化,就PMD补偿系统中的核心——取样反馈控制模块的性能进行了剖析. 相似文献
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超弹性碰撞演示实验是灵活运用大学物理知识的典型实验,本文对其最佳工作条件进行了分析,研究表明,当大球和小球的质量比为3时可以达到最佳的实验效果. 相似文献
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Doxycycline can coordinate with europium (III) to form europium (III)-doxycycline complex, which can emit the fluorescence characteristic peak of europium (III) at 617 nm in alkaline solution, and the experiment proved that the fluorescence intensity could be further enhanced in the presence of silver nanoparticles and surfactant alkylphenols polyoxyethylene. So this method was applied to detect doxycycline content in duck meat in this research. First, 390 and 617 nm were selected as the optimum excitation wavelength and optimum emission wavelength by three-dimensional fluorescence spectrometry, respectively. Second, the experimental conditions were optimized through single factor experiment. Lastly, the samples of doxycycline concentration range of 0.05–12 mg/L were analyzed under the optimum experimental conditions. A good linear relationship between the doxycycline concentration and the fluorescence intensity was obtained, and the determination coefficient and the root mean squared error of prediction were 0.9982 and 0.4363 mg/L, respectively. This research showed that it was feasible to achieve the rapid detection of doxycycline content in duck meat by using silver nanoparticles and alkylphenols polyoxyethylene enhanced the fluorescence of europium complex. 相似文献