Surface contour from a low-frequency vibrating object using phase differences and the Fourier-transform method
✍ Scribed by Cruz Meneses-Fabian; Ramon Rodriguez-Vera; Juan A. Rayas; Fernando Mendoza-Santoyo; Gustavo Rodriguez-Zurita
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 434 KB
- Volume
- 272
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
A novel phase extraction method for fringe patterns with carrier frequency and with slow variation with time is presented. It is based on the Fourier-transform method and on the quotient of the two adjacent frame fringe patterns. The fringe patterns are obtained by fringe projection on a fixed end of a homogenous cantilever undergoing harmonic vibration. Contours of different vibrating modes of the cantilever for frequencies less than that of the camera frame rate (33.3 ms) may be obtained with this method. Results are shown for the theoretical analysis and the experimental mode contours.