【摘要】 采用同轴全息技术诊断粒子场时,粒子尺寸过小会影响再现粒子统计的精度,而粒子场分布密度过大会影响全息图像的记录质量。针对可见光同轴全息中出现的微小粒子分辨和光透过率弱等问题,提出采用红外激光进行粒子场诊断的方法。数值模拟了红外激光与绿光激光记录小粒子的情况,分析结果显示:红外激光将小粒子的再现像放大,信息光增强,有利于小粒子的记录;实验验证了红外激光透过高密度物场的能力明显高于绿光激光。从而表明采用红外激光同轴全息技术进行小尺寸、高密度粒子场的实验诊断具有一定的优势。更多还原

【Abstract】 The difference of in-line particle hologram are shown mainly for different laser wavelength.The hologram of the particle field is influenced by the microparticle diameter and particle density.These two parameters may even determine the quality of the measurement.Therefore,these two parameters are mainly discussed for different laser wavelength through numerical simulation.The interference fringes of microparticle are enlarged by infrared laser and easy to resolve.Simultaneously,the transmissivity of infrared laser through the high density object field is larger than green laser and verified by experiment.All results confirm the dominance of infrared laser in-line particle holography.更多还原