Vibration measurement by projection of phase-modulated and amplitude-modulated structured light
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2023-01-05
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DIB, L. F. G.
HENRIQUE, M. C.
SAITA, M. T.
BARBOSA, E. A.
HENRIQUE, M. C.
SAITA, M. T.
BARBOSA, E. A.
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Journal of Applied Research and Technology
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DIB, L. F. G.; HENRIQUE, M. C.; SAITA, M. T.;
BARBOSA, E. A.
Vibration measurement by projection of phase-modulated and amplitude-modulated structured light.
Journal of Applied Research and Technology, v. 1, n.1, p. 11-21, maio, 2023.
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© 2023 Universidad Nacional Autonoma de Mexico. All rights reserved.Most of the whole-field optical methods for vibration measurement have low sensitivity when the points of the studied surface vibrate with the same amplitude. Those techniques also usually require complex and/or expensive solutions which are difficult to implement in engineering processes when the vibration amplitudes are relatively high. In order to overcome those limitations we propose a method for out-of-plane vibration measurement which uses structured light projection. The vibrating surface is obliquely illuminated by straight and parallel interference fringes produced by a Twyman-Green interferometer with a 532-nm laser as light source. In order to enable fringe visualization two techniques were employed, namely, the phase modulation of the fringe pattern by using a vibrating mirror in the interferometer, and a stroboscopic illumination by using a Fabry-Perot etalon amplitude modulator. We demonstrated the technique by measuring the vibration amplitudes of small objects in the millimeter and submillimeter range.