A dynamic moiré method for deformation measurement of curved surfaces

1979 ◽  
Vol 19 (4) ◽  
pp. 145-146
Author(s):  
Reinhold Ritter
Keyword(s):  
Deformation Measurement ◽  
Curved Surfaces ◽  
Moire Method

Moiré Techniques Based on Memory Function of Laser Scanning Microscope for Deformation Measurement at Micron/Submicron Scales

2015 ◽  
Vol 9 (5) ◽  
pp. 494-501 ◽  
Author(s):  
Qinghua Wang ◽  
◽  
Hiroshi Tsuda ◽  
Satoshi Kishimoto ◽  
Yoshihisa Tanaka ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Memory Function ◽  
Polyimide Film ◽  
Deformation Measurement ◽  
Scanning Microscope ◽  
Laser Scanning Microscope ◽  
Application Range ◽  
Reinforced Plastics ◽  
Moire Method ◽  
Moiré Techniques

This paper presents two up-to-date moiré techniques for deformation measurement based on the memory function of a laser scanning microscope (LSM). The two techniques are the LSM overlapping moiré method and the LSM secondary moiré method. The formation principles and the measurement principles of these two methods are presented and compared to those of the traditional scanning moiré method for the first time. The applicable conditions and characteristics of these three moiré techniques are analyzed. Some typical moiré fringes on a strain gauge, carbon fiber reinforced plastics, a polyimide film, and a silicon wafer are illustrated. Our proposed LSM overlapping moiré method and LSM secondary moiré method are able to expand the application range of the LSM in deformation measurement to the micron and the submicron scales.

Nano-Grating Fabrication Technique

2006 ◽  
Vol 326-328 ◽  
pp. 131-134 ◽  
Author(s):  
Hui Min Xie ◽  
Zhan Wei Liu ◽  
Ming Zhang ◽  
Peng Wan Chen ◽  
Feng Lei Huang ◽  
...  
Keyword(s):  
Atomic Force Microscope ◽  
Spatial Resolution ◽  
Deformation Measurement ◽  
Fabrication Process ◽  
Fabrication Technique ◽  
Micro Fabrication ◽  
Grating Fabrication ◽  
Atomic Force ◽  
Experimental Parameters ◽  
Moire Method

In this paper, a novel nano-moiré grating fabrication technique was proposed for nanometer deformation measurement. The grating fabrication process was performed with the aid of Atomic Force Microscope (AFM) on the basis of micro-fabrication technique. On the analysis of some correlative factors of influencing grating line quality, some important experimental parameters were optimized. In this study, some parallel and cross nano-gratings with frequencies of from 10000lines/mm to 20000lines/mm were fabricated. The successful experimental results demonstrate that the nano-grating fabrication technique is feasible and also indicated that these nano-gratings with nano-moiré method can be applied to deformation measurement, which offers a nanometer sensitivity and spatial resolution.

scholarly journals Dynamic Deformation Measurement by the Sampling Moiré Method from Video Recording and its Application to Bridge Engineering

2020 ◽  
Vol 44 (3) ◽  
pp. 313-327 ◽  
Author(s):  
S. Ri ◽  
H. Tsuda ◽  
K. Chang ◽  
S. Hsu ◽  
F. Lo ◽  
...  
Keyword(s):  
Field Experiment ◽  
Natural Frequency ◽  
Large Scale ◽  
Dynamic Deformation ◽  
Imaging Techniques ◽  
Video Recording ◽  
Deformation Measurement ◽  
Displacement Sensor ◽  
Microwave Radar ◽  
Moire Method

AbstractMeasuring accurate dynamic deformation distribution for large-scale structures inexpensively and efficiently is a crucial challenge of structural health monitoring. In this study, a simple technique for measuring the deflection and vibration frequency from a captured video, based on the sampling Moiré method is developed. The striking advantage over conventional measurement using sensors and other imaging techniques are that the developed technique allows accurate measurement of two-dimensional deformations at multiple locations as well as the natural frequency of the target structure. Joint Photographic Experts Group (JPEG)-formatted images encoded from the recorded video with Motion-JPEG (MJPEG) format reduced the file size significantly without degrading the measurement accuracy and applied to deformation measurement. The effectiveness of the developed technique was confirmed through a field experiment of an old bridge in Taiwan. The field experiment demonstrated that both deflection and natural frequency of the bridge were successfully measured with higher 0.1 mm displacement accuracy and 0.05 Hz frequecy comparable to a conventional microwave radar displacement sensor from 20 m distance.

Deformation Measurement of Impulsed Viscoelastic Plate with Moire Method

1999 ◽  
Vol 10 (7) ◽  
pp. 548-551 ◽  
Author(s):  
XIE HUIMIN ◽  
PETER DIETZ ◽  
AXEL SCHMIDT ◽  
SATOSHI KISHIMOTO ◽  
NORIO SHINYA ◽  
...  
Keyword(s):  
Viscoelastic Plate ◽  
Deformation Measurement ◽  
Moire Method
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