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Proceedings Paper

Holographic Investigation By Double-Pulsed Ruby Laser Of Bus Front Window Vibration
Author(s): Lennart B. M. Svensson
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Paper Abstract

The windowpane of a tourist bus is usually part of the whole coachwork and is therefore a structural element. Using double-pulsed holography it might be possible to determine if a windowpane is properly mounted on the bus chassis in order to reduce the risk for windowcracks. In order to expose incorrect mounting of the windowpane, holographic vibration analysis is used. Primarily the vibration behavior of the windowpane has to be known. Double-pulsed holography is used to investigate vibration behavior of a windowpane mounted to a modern tourist bus. The size of the busfront is: height = 2.8m and width = 2.3m. Three different vibration techniques are used: idling the motor, exciter vibration of the chassis and direct impact of the windowpane. Using the exciter, the resonance frequencies of the windowpane are measured. Theoretical calculations of the resonance frequencies of a plate clamped on four edges, considering known parameters of the windowpane, are compared with the holographic experimentally obtained resonance nodal interferometric patterns. The holographic recordings of the windowpane corresponds well with the theoretical nodal lines for a four edge clamped plate.

Paper Details

Date Published: 26 October 1989
PDF: 9 pages
Proc. SPIE 1136, Holographic Optics II: Principles and Applications, (26 October 1989); doi: 10.1117/12.961707
Show Author Affiliations
Lennart B. M. Svensson, The Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 1136:
Holographic Optics II: Principles and Applications
G. Michael Morris, Editor(s)

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