运用传统的干涉法检验光学材料的折射率均匀性时，由于锗晶体太软，表面不易加工，其表面面形难以满足测试要求。
Using traditional interferometric method, as the germanium material is too soft to process, the surface form of the test piece may not meet the requirement for the measurement.
全息图像采取了一种干涉模式，并需要利用一种光敏材料，它的原理可以简单的用传统摄影法来解释。
A hologram is a special interference pattern created in a photosensitive medium (which can be as simple as a traditional photographic film).
实时全息干涉法可以观察记录整个测试过程中条纹图的动态变化，传统相位提取算法只适合于静态干涉条纹图相位的提取。
Dynamic fringe pattern can be observed throughout the testing by real-time holographic interferometry, while the traditional method is only suitable for static fringe pattern in phase extracting.
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