Dynamic holographic interferometry with digital holography

The holographic interferometry (HI) makes it possible to gather the changes of an object contactless. In the classic HI one usual makes a double exposure at a photo plate, which makes it difficult to track dynamic changes. Even if the initial state is saved in a hologram and the following changes are detected via the real time method, the process is limited to small changes of the object in relation to its initial state, because the interference fringes might be to dense. With help of the digital holography it is possible to get new reference states in quasi real time, so this new reference can be compared to the actual state. This way a larger area of changes can be detected and the full dynamics of a process can be detected. To reduce the disturbing speckle-structure, we propose a method of phase encoding of the reference wave, without loosing the resolution.