Detection of nonlinear distortions in the vibration of acoustically driven mechanical systems using heterodyne vibrometry

J. R. M. Aerts; J. J. J. Dirckx; R. Pintelon

doi:10.1117/12.803010

17 June 2008 Detection of nonlinear distortions in the vibration of acoustically driven mechanical systems using heterodyne vibrometry

J. R. M. Aerts, J. J. J. Dirckx, R. Pintelon

Author Affiliations +

Proceedings Volume 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 70980R (2008) https://doi.org/10.1117/12.803010
Event: Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2008, Ancona, Italy

Abstract

Recently, a measurement set-up was presented to detect small nonlinear distortions in the vibration of acoustically driven mechanical systems. A speaker generates a specially designed multisine excitation signal that drives the vibration of a test object. The generated sound pressure is measured with a probe microphone in front of the test object, and an heterodyne vibrometer measures the corresponding vibration. Due to the high degree of linearity of the heterodyne technique, very small nonlinear distortions can be detected. In this paper the set-up is used to verify whether small nonlinear distortions are present in the vibration of the middle ear system, which is classically considered to be a completely linear system. In vitro measurements on the right ear of an adult male gerbil proved that nonlinear distortions are present in the vibration of the tympanic membrane. Similar results were seen in measurements on the left ear. The influence of post-mortem changes on the nonlinear behaviour of the middle ear was verified in a number of successive measurements. These indicated that the nonlinear behaviour of the middle ear decreases in time.

Citation Download Citation

J. R. M. Aerts, J. J. J. Dirckx, and R. Pintelon "Detection of nonlinear distortions in the vibration of acoustically driven mechanical systems using heterodyne vibrometry", Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 70980R (17 June 2008); https://doi.org/10.1117/12.803010

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