Full-Field Laser Vibrometer for Instantaneous Vibration Measurement and Non-Destructive Inspection

Abstract:

We describe a system for real-time, full-field vibrometry, incorporating features of high-speed electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV). Based on a 2D interferometric sensor array, comprising 16×16 parallel illumination and detection channels, the matrix laser vibrometer (MLV), captures full-field data instantaneously, without beam scanning. The instrument design draws on the advantages of scale offered by modern telecommunications fiber optic and digital electronics. The resulting architecture, comprising a compact measurement probe linked by fiber optic umbilical to a remote electronics unit, facilitates practical application to the full-field study of transient vibrations and rapid non-destructive inspection of composite materials.

• Periodical: Key Engineering Materials (Volume 437)
• Pages: 407-411
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.437.407
• Online since: May 2010
• Authors: James M. Kilpatrick, Vladimir B. Markov
• Keywords: Laser Doppler Velocimetry, Nondestructive Testing (NDT), Vibration Studies

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