Three-dimensional profilometry using moire pattern projection

2000 ◽  
Author(s):  
Toru Yoshizawa ◽  
Takayoshi Yamaguchi ◽  
Masayuki Yamamoto ◽  
Yukitoshi Otani
Keyword(s):  
Three Dimensional ◽  
Moire Pattern ◽  
Pattern Projection ◽  
Moiré Pattern

Structured lighting method using moire pattern projection

2002 ◽  
Author(s):  
Toru Yoshizawa ◽  
Takayoshi Yamaguchi ◽  
Hiroshi Takahashi ◽  
Naohito Ikeda ◽  
Masayuki Yamamoto ◽  
...  
Keyword(s):  
Moire Pattern ◽  
Structured Lighting ◽  
Pattern Projection ◽  
Moiré Pattern

Measurement of Gingival Swelling from Dental Casts by Generation of a Moire Pattern with Laser Light

1988 ◽  
Vol 67 (8) ◽  
pp. 1118-1121 ◽  
Author(s):  
F.R. Wouters ◽  
C. Jon-And ◽  
N. Abramson ◽  
L. Olsson ◽  
L. Frithiof ◽  
...  
Keyword(s):  
Laser Light ◽  
Three Dimensional ◽  
Processing System ◽  
Measuring Method ◽  
Direct Evaluation ◽  
Moire Pattern ◽  
Moiré Pattern ◽  
Helium Neon Laser ◽  
Computer Based ◽  
Dental Casts

The aim of the study was to develop a sensitive measuring method enabling direct evaluation of gingival swelling to be made as registered on dental casts. On two separate occasions, when different degrees of severity of gingival inflammation were present in the same subject, reversible hydrocolloid impressions were taken of the mandible. The casts obtained were located successively in identical three-dimensional relationships in a field of interference fringes generated by two intersecting beams of collimated helium-neon laser light, and were photographed. The evaluation of the moiré pattern obtained directly by superimposition of the two images of the surface studied indicated that a decrease in gingival height of 0.38 mm in the direction of the camera had occurred between the two occasions. The use of a computer-based image-processing system considerably improved the visibility of the pattern. The reproducibility of the impression technique, as well as the relocation and superimposing techniques, proved satisfactory at the moiré resolution used (0.19 mm). The method has potential application in clinical experimental research, and therefore warrants further evaluation.

MoirÉ Pattern Studies of Thin Layers Deposited on (001)Si Substrates: Cases of Tisi2 and GaAs.

1989 ◽  
Vol 148 ◽  
Author(s):  
A. Rocher ◽  
X. Wallart ◽  
M.N. Charasse
Keyword(s):  
Three Dimensional ◽  
Thin Layers ◽  
Dislocation Network ◽  
Threading Dislocations ◽  
Si Substrates ◽  
Moire Pattern ◽  
Moiré Pattern ◽  
Dimensional Growth ◽  
Residual Strains

ABSTRACTMoiré pattern images have been used to investigate the crystalline quality of thin films deposited on (100)Si substrates. Observations performed on TiSi2 show a three-dimensional growth process and two different epitaxial modes. In the case of GaAs epilayers, it is shown that the residual strains are not uniformly distributed in the layer. Residual strain and threading dislocations are related to imperfections of the misfit dislocation network.

scholarly journals Moiré pattern of interference dislocations in condensate of indirect excitons

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. R. Leonard ◽  
Lunhui Hu ◽  
A. A. High ◽  
A. T. Hammack ◽  
Congjun Wu ◽  
...  
Keyword(s):  
Long Range ◽  
Direct Measurement ◽  
Quantum Systems ◽  
Matter Waves ◽  
Moire Pattern ◽  
Indirect Excitons ◽  
Moiré Pattern ◽  
Moiré Effect ◽  
Phase Singularities ◽  
Bose Einstein

AbstractInterference patterns provide direct measurement of coherent propagation of matter waves in quantum systems. Superfluidity in Bose–Einstein condensates of excitons can enable long-range ballistic exciton propagation and can lead to emerging long-scale interference patterns. Indirect excitons (IXs) are formed by electrons and holes in separated layers. The theory predicts that the reduced IX recombination enables IX superfluid propagation over macroscopic distances. Here, we present dislocation-like phase singularities in interference patterns produced by condensate of IXs. We analyze how exciton vortices and skyrmions should appear in the interference experiments and show that the observed interference dislocations are not associated with these phase defects. We show that the observed interference dislocations originate from the moiré effect in combined interference patterns of propagating condensate matter waves. The interference dislocations are formed by the IX matter waves ballistically propagating over macroscopic distances. The long-range ballistic IX propagation is the evidence for IX condensate superfluidity.

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