Moire interferometry typically involves the acquisition of at least three images of an object surface, using a projection and submaster grating to produce the moire interference patterns. Extraction of the depth information assumes a sinusoidally varying fringe pattern, which results when the two gratings themselves vary sinusoidally. However, it is generally easier and less costly to fabricate ronchi gratings, which are therefore more commonly employed in moire interferometers. In addition, a phase grating is frequently used as the submaster, instead of the more familiar amplitude grating.
| Number of Pages : | 8 |
| Published : | 11/01/2000 |
