Accuracy of Sampling Moiré Method and the Application to Deflection Measurement of Large-scale Structures

Details Accuracy of Sampling Moiré Method and the Application to Deflection Measurement of Large-scale Structures Accuracy of Sampling Moiré Method and the Application to Deflection Measurement of Large-scale Structures

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1236..363r&link_type=abstract

INTERNATIONAL CONFERENCE ON ADVANCED PHASE MEASUREMENT METHODS IN OPTICS AND IMAGING. AIP Conference Proceedings, Volume 1236,

Physics

Optics

Moire Fringes, Image Processing, Diffraction Gratings, Fourier Transform Optics, Charge-Coupled Devices, Speckle And Moire Patterns, Image Forming And Processing, Gratings, Fourier Optics, Optical Elements, Devices, And Systems

Scientific paper

Recently, a simple and accurate phase measurement technique called sampling moiré method is developed for accurate small displacement distribution measurement by one of the authors. In this method, the phase distribution of moiré fringes can be analyzed from a single grating image by performing image processing of down-sampling and image interpolation to generate multiple phase-shifted moiré fringe images. In this work, measurement accuracy of the sampling moiré method is investigated both by a computer simulation and a displacement measurement experiment. Three factors of sampling pitch, order of image interpolation and waveform of grating are analyzed. In addition, an application of the sampling moiré method applied to deflection measurement of a long crane with 10 meter is presented. Experimental results show that sub-millimeter deflection of the crane can be detected successfully. Sampling moiré method is a promising technique for various research field in experimental mechanics such as evaluation of materials property, structural health monitoring of a large-scale structures, etc.

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