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Optical Engineering

Continuous scanning laser Doppler vibrometer for mode shape analysis
Author(s): Jongpil La; Jieun Choi; Semyung Wang; Kyoungsuk Kim; Kyihwan Park
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Paper Abstract

The vibration mode shape measurement technique utilizing a continuous scanning laser Doppler vibrometer (SLDV) is addressed. Continuous scanning capability is added to the conventional discrete laser Doppler vibrometer by reflecting the laser beam on the surface of the object using two oscillating mirrors. Bow scanning resulting from the proposed scanning mechanism is compensated by controlling the two mirrors. If a continuous sinusoidal scanning method is used, it can be shown that the velocity output signal from the SLDV is modulated to give the spatial velocity distribution in terms of coefficients that are obtained from the Fourier transformation of the time-dependent velocity signal. Using the Chebyshev series form, the analysis of vibration mode shape techniques for 2-D scanning is presented and discussed. The performance of the proposed SLDV is presented using the experimental results of the vibration mode shape of a plate.

Paper Details

Date Published: 1 March 2003
PDF: 8 pages
Opt. Eng. 42(3) doi: 10.1117/1.1533794
Published in: Optical Engineering Volume 42, Issue 3
Show Author Affiliations
Jongpil La, Kwangju Institute of Science and Technology (South Korea)
Jieun Choi, Kwangju Institute of Science and Technology (South Korea)
Semyung Wang, Kwangju Institute of Science and Technology (South Korea)
Kyoungsuk Kim, Chosun Univ. (South Korea)
Kyihwan Park, Kwangju Institute of Science and Technology (South Korea)


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