摘要
利用红外热像实时监测系统,研究了GaAs表面不同运动状态(包括静止状态、缓慢运动状态、快速运动状态)下H2SO4-H2O2-H2O液滴的红外辐射特性,并对实验结果和研究价值进行分析.主要的实验结论包括:静止状态时,反应生成热在液滴内部向上对流,液滴顶部为红外辐射灰度峰值,并向液滴边缘陡降,同时,生成热将沿GaAs基片向周边扩散;缓慢运动时,液滴后存在类似于“彗尾”的热残留现象,表现为温度降低、灰度峰值与液滴运动同向的“双重运动特性”,灰度峰值位移曲线与液滴实际位移存在差异,温度最高点有可能位于“慧尾”中;快速运动时,液滴未与GaAs反应便脱离基片,表现为“液膜轨迹”现象,辐射灰度从液膜边缘到液膜中心为半椭圆面的平缓过渡,并分析了轨迹中心灰度值的分布与变化特性.液滴运动热行为红外监测方法的提出,在推动液滴自身研究的同时,也将进一步推动红外技术与材料科学、化学科学等交叉学科的融合.
Using the infrared thermal image real-time monitoring system developed independently in our laboratory, the infrared characteristics of H2 SO4-H2O2-H2O droplet in different movement states on the surface of GaAs substrate is studied, including, for instance, the static state, the slow motion state and the quick motion state. The obtained experimental results and the merit of our system are discussed. The main conclusions drawn from the experiments includes： In the static state, the created heat produces convection inside the droplet, the peak value of infrared radiation distribution is located at the top of droplet and the heat diffuses to the ambient along GaAs substrate, which causes the radiation to drop steeply at the edge of droplet. In the slow motion state, the residual heat phenomenon revealing as ＂comet tail＂ is observed when the droplet moves across the substrate surface, and as the temperature decreases, the radiation peak ＂co-moves＂ with the droplet in the same direction, in addition, the displacement curve of the radiation peak lags behind the actual displacement of the droplet and the maximum temperature may appear in the ＂comet tail＂. In the quick motion state, the phenomenon shows as ＂liquid film trace＂ because the droplet leaves the substrate without reacting with GaAs, and the value of infrared radiation varies smoothly, showing in the gray-scale pattern as a half ellipse extending from the edge to the center of liquid film. The distribution and characteristic variety of grey-scale in the center of the trace is also analyzed. The proposed infrared monitoring system of thermal behavior of moving droplets will prompt the research of the droplet itself as well as the interdisciplinary studies, in which, for example, the infrared technology being introduced into material sciences and chemistry sciences and so on.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第6期3172-3177,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60277008)
教育部重点项目(批准号:03147)
国防科技重点实验室基金项目(批准号:514910501005DZ0201)
四川省科技厅(批准号:04GG021-020-01)资助的课题~~
关键词
红外热像
实时监测
液滴
砷化镓
infrared thermal image, real-time monitoring, droplet, GaAs
