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液体泡沫对激光的伪装性能分析

应用光学 2014年第4期35卷 720-724页

作者：李志刚汪家春赵大鹏陈宗胜王启超时家明电子工程学院脉冲功率激光技术国家重点实验室安徽合肥230037 电子工程学院红外与低温等离子体安徽省重点实验室安徽合肥230037

为了研究液体泡沫的激光伪装应用,实验分析了液体泡沫对1.06μm激光的伪装性能。采用对比试验方法测得了不同液体泡沫结构参数下的1.06μm激光回波衰减值,结果显示,衰减值最高可达66%,最低为36%。结合激光伪装要求,以草地和钢板为例,理... 详细信息

为了研究液体泡沫的激光伪装应用,实验分析了液体泡沫对1.06μm激光的伪装性能。采用对比试验方法测得了不同液体泡沫结构参数下的1.06μm激光回波衰减值,结果显示,衰减值最高可达66%,最低为36%。结合激光伪装要求,以草地和钢板为例,理论计算分析了液体泡沫用来实现1.06μm激光伪装可行性。结果表明,使用2cm厚液体泡沫对钢板进行伪装,激光回波衰减达到36%,在草地背景伪装要求的30%~40%范围内。说明液体泡沫具有较好的1.06μm激光伪装性能,利用液体泡沫可实现激光伪装和地面目标有效防护。

关键词：光学工程液体泡沫激光干扰激光伪装

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液体泡沫对激光的透射衰减性能分析

舰船电子对抗 2015年第4期38卷 17-20页

作者：李志刚时家明脉冲功率激光技术国家重点实验室合肥230037

液体泡沫作为一种新的宽波段无源干扰手段,对激光具有透射衰减作用。探讨了单个液泡和液体泡沫层对激光的透射衰减机理,进行了液体泡沫的激光透射衰减性能实验,发现液体泡沫层对1.06μm激光具有较强的衰减能力,根据实验结果分析了液体... 详细信息

液体泡沫作为一种新的宽波段无源干扰手段,对激光具有透射衰减作用。探讨了单个液泡和液体泡沫层对激光的透射衰减机理,进行了液体泡沫的激光透射衰减性能实验,发现液体泡沫层对1.06μm激光具有较强的衰减能力,根据实验结果分析了液体泡沫层厚度、泡沫中心尺寸、泡沫类型等因素对激光透射衰减性能的影响。研究结果对于液体泡沫的激光干扰运用具有指导意义。

关键词：液体泡沫激光干扰激光透射衰减

Influence of gravity on narrow input forced drainage in 2D liquid foams

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Chinese Science Bulletin 2007年第3期52卷 423-427页

作者： SUN QiCheng GE Wei HUANG Jin Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

Liquid foam is a dense packing of gas bubbles in a small amount of liquid containing surfactants or other surface-active macromolecules, which is one of the highly organized materials and possesses hallmark rheological behaviour of soft matters. Forced foam drainage is the flow of constantly inputted liquid through the network of interstitial channels between bubbles under actions of gravity and capil-larity. This process involves two mechanisms: minimal viscous flow dissipation of liquid and minimal surface energy of bubbles. For constant surfactant solution, viscous dissipation usually varies with gravity. This work reports simulations of 2D forced foam drainage with narrow input in a Hele-Shaw cell under 8 different gravities, g, ranging from 9.8 to 0 ms?2. The spread of liquid both vertical due to gravity action, and horizontal due to capillary suction, is recorded over time. Positions of drainage wave fronts in both directions with time are found to be well described in the power law form, and the exponents are 0.536+5.29×10-3g and 0.479?7.27×10-3g, respectively, while the sum is close to a constant of 1.015 which is independent of gravity. For g=9.8 ms-2, the calculated exponents are in good agreement with experimental results by Hutzler et al. and Wang.

关键词：液体泡沫重力效应微重力强制滴流表面能

Foam drainage wave coalescing and its energy evolution

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Chinese Science Bulletin 2008年第20期53卷 3138-3141页

作者： SUN QiCheng HUANG Jin WANG GuangQian State Key Laboratory for Hydroscience and Engineering Tsinghua University Beijing 100084 China Institute for Corrosion and Multiphase Technology Ohio University Ohio 45701 USA

Liquid foam is a dense packing of gas bubbles in a small amount of surfactant solution. Liquid drains out of foams until equilibrium is reached due to the compromise between gravity and capillarity, which greatly affects the stability of foam. Based on a series of work on foam structure and drainage we conducted previously, this paper reports the results on coalescence of an original forced drainage wave at a low flow rate with subsequent drainage waves with higher flow rates. The evolutions of viscous energy and surface energy during the process of coalescence are theoretically analyzed.

关键词：液体泡沫排水泡沫物理学表面活性剂能量变化