Instantaneous measurement of surface shape with high accuracy by one-shot digital holography
この論文をさがす
説明
A new method is proposed for instantaneous measurement of 3-D shape of moving objects with rough surface by using one-shot digital holography. The principle of proposed method consists of projection of interference fringes with a constant period on surfaces, one-shot recording of the complex-amplitude in-line hologram, elimination of speckle from reconstructed images, and calculation of depth from focus. The acquisition time is less than 1 micro-second needed for recording one hologram. Speckles appeared in reconstructed images are eliminated into a low level by filtering. Following the method of depth of focus, we can precisely determine 3-D position of each point on the surface. Accuracy higher than 0.01% is obtained in the experiment of depth measurement because of low-level speckles.
収録刊行物
-
- SPIE Proceedings
-
SPIE Proceedings 7957 795708-, 2011-02-10
SPIE