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利用背光阴影成像技术研究了降温速率对惯性约束聚变(ICF)球形氘氘冷冻靶中燃料冰层均化的影响.实验中,首先对ICF冷冻靶温度场进行标定以确定靶丸处的温度,然后利用背光阴影成像系统对降温过程中靶丸内燃料冰层的空间变化进行实时原位测量,得到了不同降温条件下冷冻靶背光阴影成像图像中亮环的功率谱.实验结果表明:相比快速降温,台阶式缓慢降温有利于形成均匀的燃料冰层;同时验证了背光阴影成像技术表征ICF冷冻靶内冷冻冰层均化的有效性. 相似文献
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发展了背光阴影成像技术,用于诊断透明ICF冷冻靶冰层内表面质量。分析了单层球壳阴影图像中形成亮环的物理机制。用光学追迹软件Tracepro模拟产生了透明单层球壳的阴影图像,用于研究亮环位置与球壳厚度及折射率的关系。建立了背光阴影成像实验装置,获得了透明单层球壳具有明显亮环的实验阴影图像。编制了阴影图像处理软件,获得了靶丸内表面1维功率谱曲线,并据此计算出靶丸内表面均方根粗糙度。理论分析、软件模拟及实验研究均表明,背光阴影成像技术是透明冷冻靶冰层内表面质量的有效诊断方法。 相似文献
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This paper theoretically explores the effect of PM2.5 air pollution on the phase precision of a Mach–Zehnder interferometer. With the increasing of PM2.5 concentration, phase precision for inputs of coherent state vacuum state and inputs of coherent state squeezed vacuum state will gradually decrease and be lower than the standard quantum limit.When the value of relative humidity is increasing, the precision of two input cases is decreasing much faster. We also find that the precision for inputs of coherent state squeezed state is better than that of coherent state vacuum state when PM2.5 concentration is lower. As PM2.5 concentration increases, the precision for inputs of coherent state squeezed state decreases faster, and then the two precisions tend to be the same while the concentration is higher. 相似文献
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A specific-wavelength infrared(IR) light(λ = 3140 nm) was irradiated into a solid D2 ice prepared in a cylinder target cell.The temperature in the solid D2 ice oscillated periodically with a high amplitude when irradiated by the IR light.The temperature oscillation has been well explained based on the two-dimensional heat transfer theory plus the IR-irradiation effect.The transmission optical imaging reveals that such a temperature oscillation is favorable to recrystallize the solid D2 ice from multicrystal to quasi single crystal.This suggests an efficient method to layer the solid hydrogen-isotope ice for the inertial-confinement-fusion(ICF) experiments. 相似文献
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目前,具有螺旋相位波前和环状光强分布的涡旋光束已在光学领域获得了广泛应用,其产生与调控自然成了研究的热点。利用三维粒子模拟程序对双色拉盖尔高斯激光驱动固体等离子激发同时携带自旋角动量与轨道角动量的高次谐波的物理过程进行了研究,根据高次谐波产生过程中的光子能量与角动量守恒定律对其内在物理机制进行了理论分析,并讨论了对谐波阶次、偏振态(自旋角动量)以及拓扑荷数(轨道角动量)进行调控的方法。研究结果为开发高亮度、超短超快、短波长、自旋与轨道角动量可调控的涡旋光束辐射源提供了理论依据,在光学微操控、超分辨成像、光通信以及离子加速等领域具有较大的实际应用前景。 相似文献
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