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Proceedings Paper

Self-mixing laser diode vibrometer with wide dynamic range
Author(s): Guido Giuliani; Silvano Donati; Lorenzo Monti
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Paper Abstract

We present a new type of laser vibrometer based on the self—mixing interference effect in a laser diode. The self—mixing configuration allows for a practical set—up that is by far simpler than conventional laser vibrometer schemes and can be assembled at a low cost. The vibrometer principle relies on locking of the interferometer to half interferometric fringe, and on active phase—nulling technique by wavelength modulation, that permits to achieve an extended dynamic range still retaining a sensitivity in the sub—nm range. A prototype of the vibrometer has been designed and assembled, and it can operate on nearly all rough surfaces. The vibrometer noise floor is 100 pm/?Hz, the maximum measurable vibration amplitude is 600 ?m peak—to—peak, and the instrument covers the 0. 1 Hz—70 kHz frequency range of vibration. The self—mixing vibrometer can find application in modal analysis and noise and vibration measurements in industrial and scientific environments.

Paper Details

Date Published: 22 May 2002
PDF: 10 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468177
Show Author Affiliations
Guido Giuliani, Univ. degli Studi di Pavia (Italy)
Silvano Donati, Univ. degli Studi di Pavia (Italy)
Lorenzo Monti, Univ. degli Studi di Pavia (Italy)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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