一种基于偏振特性的水面溢油实验检测方法

水面溢油在反射与辐射过程中,表现出与其自身性质相关的偏振特性,这种与水面溢油性质相关的偏振特性可用Stokes矢量表示.以650 nm的线偏振激光为光源,在实验室用偏振分析仪测量了水面与油面反射时的stokes矢量.通过调节线偏振光的振动面与入射面的角度,实验发现水面与油面的stokes矢量在邦加球中的轨迹有明显的区别,由此可以实现对水面溢油的检测.     

水面溢油可见/近红外偏振光检测方法研究

在前期水面溢油偏振光检测方法的基础上,分析了液面反射光偏振状态在邦加球中的变化,给出了这种测量方法的物理分析。该方法以线偏振光作为入射光源,在入射光的布儒斯特角附近,利用反射光偏振状态在邦加球中轨迹的不同,达到检测不同种类油、水以及不同厚度油膜的目的。进一步以650,850,1064,1310,1550nm可见/近红外波长线偏振光以及不同油种做了实验,实验结果与物理分析一致。     

Double-null divertor configuration discharge and disruptive heat flux simulation using TSC on EAST

The tokamak simulation code (TSC) is employed to simulate the complete evolution of a disruptive discharge in the experimental advanced superconducting tokamak.The multiplication factor of the anomalous transport coefficient was adjusted to model the major disruptive discharge with double-null divertor configuration based on shot 61 916.The real-time feed-back control system for the plasma displacement was employed.Modeling results of the evolution of the poloidal field coil currents,the plasma current,the major radius,the plasma configuration all show agreement with experimental measurements.Results from the simulation show that during disruption,heat flux about 8 MW m-2 flows to the upper divertor target plate and about 6 MW m-2 flows to the lower divertor target plate.Computations predict that different amounts of heat fluxes on the divertor target plate could result by adjusting the multiplication factor of the anomalous transport coefficient.This shows that TSC has high flexibility and predictability.     

基于激光散斑数字图像相关法的热应变测量

为了解决常规数字图像相关法应用于高温工况下热应变测量时,人工制作的散斑受高热载荷冲击容易出现变色、熔化、脱落的问题,采用激光散斑作为数字图像相关法特征纹理的方法,计算温度变化前后散斑图像相关性来测量金属热应变,进行了非真空环境下加热试件的实验,以及在管式加热炉中分别对铝试件和钨试件进行人工散斑和激光散斑的真空加热实验对比,取得了相应的散斑图像,并计算出平均应变曲线数据。结果表明,在非真空环境下,由于热流扰动导致激光散斑图像抖动较大,测量出的热应变曲线存在较大的干扰噪声;铝从室温升至450℃和钨从室温升至800℃的热应变与人工散斑结果相对一致;激光散斑数字图像相关法在类似聚变堆偏滤器高真空、高热流条件下,可以有效地测出金属壁面的动态热应变。该研究为聚变堆偏滤器第一壁材料的损伤诊断提供了新思路。