Analysis of periodic motions using moire fringes

Optics: measuring and testing – By polarized light examination – With light attenuation

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G01B 1116, G01B 1124

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049782223

ABSTRACT:
Periodic motions are analyzed by generation of real time moire fringe images. A line grating mounted on the object (1) surface is photographed using a rigidly supported camera (4) from an oblique angle to the plane of the grating. A negative transparency of the line grating is placed within the camera (4) supported by a glass plate and, with the shutter open, the transparency is first registered with the instant image of the stationary line grating then skewed to produce mismatch fringes. A TV camera (6) monitors the subsequent interaction between the skewed negative and the instant image of the line grating on the moving object (1) as seen on the glass plate at the camera image plane and this interaction is displayed on a TV monitor (10). The image is characterized by the presence of a secondary fringe phenomena indicative of object displacements.

REFERENCES:
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Optical Engineering, vol. 24, No. 4, Jul./Aug. 1985, (Bellingham, Washington, U.S.A.), D. Post: "Moire Interferometry for Deformation and Strain Studies", pp. 663-667.
Journal of Phycis E; Scientific Instruments, vol. 8, No. 9, Sep. 1975, (Havant, GB), C. A. Miles et al, "Recording the Shape of Animals by a Moire Method", pp. 773-776.
Applied Optics, vol. 22, No. 6, 15 Mar. 1983, Optical Society of America, (N.Y., U.S.A.), K. G. Hardin et al., "Projection Moire Interferometer for Vibration Analysis", pp. 856-886.
Soviet Journal of Nondestructive Testing, vol. 20, No. 12, Dec. 1984, Plenum Pub. Corp. (N.Y., U.S.A.), S. T. De et al, "Using the Moire Pattern of Interference Fringes for Detecting Defects", pp. 772-779.

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