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Hook method: Recovery of density information from interferograms distorted by large spatial gradients

机译：挂钩方法：从受大空间梯度扭曲的干涉图中恢复密度信息

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The hook method is a well-established technique for measuring the spatial distribution of species' densities in the gas phase, particularly in optically thick plasmas. However, in the presence of large density gradients (such as those occurring in a metal vapor laser plasma), the hook interferogram suffers severe distortion and the standard hook equation is invalid. By the use of a computer simulation of fringe formation, it is shown that this effect arises as a result of the strong wavelength-dependent lensing of probe rays in the test medium. On the basis of this lensing mechanism, a criterion has been derived for the maximum permissible density gradient, above which the standard hook analysis cannot be accurately applied. Finally, a new technique is presented that permits density data to be recovered from interferograms that are too distorted to analyze by the use of standard techniques, This technique is based on extracting density gradient values from distortion-free features of the fringe pattern. The new technique also permits density data to be obtained with an increased spatial resolution over that of the standard hook analysis. (C) 1997 Optical Society of America.
机译：钩方法是一种成熟的技术，用于测量气相中物种密度的空间分布，特别是在光学上较厚的等离子体中。但是，在存在较大的密度梯度（例如在金属蒸气激光等离子体中出现的密度梯度）的情况下，钩形干涉图会出现严重的失真，并且标准的钩形方程式无效。通过使用计算机模拟条纹的形成，表明这种效果是由于受测介质中探针射线强烈依赖于波长的透镜作用而产生的。基于这种透镜机制，已经导出了最大允许密度梯度的标准，超过该标准就无法准确地应用标准钩子分析。最后，提出了一种新技术，该技术可通过使用标准技术从太扭曲而无法分析的干涉图中恢复密度数据。该技术基于从条纹图案的无失真特征中提取密度梯度值。新技术还允许以比标准钩子分析更高的空间分辨率获得密度数据。 （C）1997年美国眼镜学会。

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