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Related Experiment Video

Updated: Jul 14, 2026

Measurement of Chladni Mode Shapes with an Optical Lever Method

Measurement of Chladni Mode Shapes with an Optical Lever Method

Published on: June 5, 2020

Multipoint laser vibrometer for modal analysis.

William N MacPherson¹, Mark Reeves, David P Towers

¹School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK. w.n.macpherson@hw.ac.uk

|May 22, 2007

Summary

Researchers developed a multipoint laser vibrometer for detailed vibration analysis. This system captures both amplitude and phase across 256 points, enabling precise mode shape recovery for engineering applications.

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Area of Science:

Mechanical Engineering
Vibration Analysis
Experimental Physics

Background:

Multifrequency vibration analysis requires high-resolution measurement systems.
Understanding vibration necessitates capturing both amplitude and phase information.
Existing systems may lack the necessary spatial or temporal resolution for complex modes.

Purpose of the Study:

To present a novel multipoint laser vibrometer system.
To demonstrate its capability for high-resolution modal analysis.
To validate its performance in practical engineering scenarios.

Main Methods:

Development of a laser vibrometer capable of simultaneous measurement at 256 points along a line.
Operation at a temporal resolution of up to 80 kHz.
Application to modal analysis of a test object under transient excitation and a rotating disk brake.

Main Results:

Successful recovery of modal vibration data from a test object.
Demonstration of high spatial and temporal resolution in vibration measurements.
Successful application to measure vibrations on a squealing rotating disk brake.

Conclusions:

The developed multipoint laser vibrometer provides essential spatial and temporal resolution for modal analysis.
The system effectively measures both vibration amplitude and phase.
It offers a practical solution for analyzing complex vibrations in engineering components.