Vibration amplitude mapping by stroboscopic structured light projection
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2023-03-15
Autores
RIBEIRO, I. L. F.
CARVALHO, G. L.
DIB, L. F. G.
BARBOSA, E. A.
WETTER, N. U.
CARVALHO, G. L.
DIB, L. F. G.
BARBOSA, E. A.
WETTER, N. U.
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Optics Communications
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RIBEIRO, I. L. F.; CARVALHO, G. L.; DIB, L. F. G.; BARBOSA, E. A.; WETTER, N. U. Vibration amplitude mapping by stroboscopic structured light projection. Optics Communications, v. 531, mar. 2023.
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© 2022 Elsevier B.V.In this work a method to evaluate the distribution of vibration amplitudes of objects was demonstrated, combining for the first time oblique structured light projection, stroboscopic illumination and fringe evaluation. The light pattern was formed by straight and parallel fringes produced by a slightly misaligned Twyman–Green interferometer illuminated by a 40-mW, 650-nm diode laser. Stroboscopic illumination was achieved by driving the laser with a PWM signal with the same frequency than that of the vibrating object. By evaluating the fringes with phase stepping and phase unwrapping procedures, the amplitude mapping of a formica bar and circular rubber membranes was performed. By averaging the fringe position over the light pulse duration a correction ratio between the actual phase and the measured phase was obtained as a function of the pulse duty cycle, and the dependence of the fringe visibility on the duty cycle was studied. The experiments showed that relatively large amplitudes in a range from tens of millimeters up to few millimeters can be measured.