Moiré interferometry of short wavelength Rayleigh–Taylor growth
Moiré interferometry of short wavelength Rayleigh–Taylor growth
复制标题
短波长瑞利-泰勒生长的莫尔干涉测量
DOI：
10.1063/1.1149434
复制
发表时间：
1999
影响因子：
1.6
通讯作者：
N. Miyanaga
中科院分区：
文献类型：
--
作者：
M. Matsuoka;H. Azechi;M. Nakai;N. Izumi;K. Shigemori;T. Nagaya;N. Miyanaga
为了更好地理解烧蚀瑞利-泰勒（RT）不稳定性，要测量的最关键的量之一是截止波长，低于该截止波长，RT不稳定性稳定。不幸的是，该波长预计将低于或接近RT实验中使用的大多数X射线成像仪的空间分辨率。我们提出并测试了一种新的技术，使用莫尔干涉法转换为较长波长的扰动短波长的扰动。RT目标由X射线背光并像传统实验一样成像，但在目标和X射线成像仪之间插入网格掩模。网格掩模是一维网格，其周期与RT目标的波长略有不同。其被设置为使得栅格和RT扰动槽彼此平行。通过这种操作，长波长莫尔干涉被测量为与RT目标的拍频。作为初步的测试，我们使用一个10 μm周期的栅极掩模耦合到RT目标8和12…
One of the most critical quantities to be measured for better understanding of the ablative Rayleigh–Taylor (RT) instability is the cutoff wavelength below which the RT instability is stabilized. Unfortunately, this wavelength is expected to be below or close to spatial resolutions of most x-ray imagers used in the RT experiments. We propose and test a new technique using moire interferometry to convert short wavelength perturbations to longer wavelength perturbations. The RT target is backlit by x rays and imaged just like in conventional experiments, but a grid mask is inserted between the target and the x-ray imager. The grid mask is one dimensional grid with a period slightly different from the wavelength of the RT target. It is set so that the grid and the RT perturbation groove are parallel to each other. With this operation, the long wavelength moire interference is measured as the beat with the RT target. As an initial test, we use a grid mask with 10 μm period coupled to RT targets with 8 and 12 ...