Illuminated spot size and signal detection in laser Doppler vibrometry

Vikram, Chandra S.; McDevitt, Timothy E.

doi:10.1016/0143-8166(89)90013-4

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Hence, the actual velocity measurement from the LDV is averaged over the beam spot area [81]. It is essential to make the spot size as small as possible since it was observed that the heterodyne signal improved when the beam spot is reduced [82].…”

Section: )mentioning

confidence: 99%

“…Thus, normally quarterwave plates are introduced in the interferometer arms to ensure that the object beam has the same polarization as that of the reference beam [91]. In addition, both target and reference beams must be parallel and of equal intensities [82].…”

Section: Common Optical Setups Of Ldvmentioning

confidence: 99%

“…In most of our experiments, we placed the object at the distance about 50 cm, which is set to be the focal length of the lens. We can use the following equation [82] to estimate the diameter of the laser spot on the target object:…”

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confidence: 99%

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Novel techniques for laser doppler vibrometry for vibrating shiny and mirror surfaces

Agusanto¹

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Section: )mentioning

confidence: 99%

Section: Common Optical Setups Of Ldvmentioning

confidence: 99%

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Novel techniques for laser doppler vibrometry for vibrating shiny and mirror surfaces

Agusanto¹

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Defect characterization of roller bearing surfaces with laser Doppler vibrometry

Valliapan

Lieu

1992

Precision Engineering

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Wave decomposition of the vibrations of a cylindrical shell with an automated scanning laser vibrometer

Kil

Jarzynski

Berthelot

1998

The Journal of the Acoustical Society of America

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Elastic waves propagating in a cylindrical shell have been detected by an automated scanning laser vibrometer designed to record both in-plane and out-of-plane surface motion over the surface of the shell (32 points axially and 32 points circumferentially). The structure was freely suspended in air and excited radially by a shaker at a single frequency, either below or above the ring frequency of the shell. A wave vector analysis of the data was performed with a fast Fourier transform and an overdetermined modified extended Prony method. The results clearly show the presence of longitudinal, shear, and flexural waves above the ring frequency. In addition, the Prony method reveals the presence of evanescent waves due to mode conversion of the propagating waves near the ends of the shell. Below the ring frequency, two types of in-plane waves and flexural waves were identified. The results are in excellent agreement with predictions from the dispersion curves for thin shells.

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Illuminated spot size and signal detection in laser Doppler vibrometry

Cited by 3 publications

References 12 publications

Novel techniques for laser doppler vibrometry for vibrating shiny and mirror surfaces

Novel techniques for laser doppler vibrometry for vibrating shiny and mirror surfaces

Defect characterization of roller bearing surfaces with laser Doppler vibrometry

Wave decomposition of the vibrations of a cylindrical shell with an automated scanning laser vibrometer

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