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Proceedings Paper

Self-mixing laser diode vibrometer for the measurement of differential displacements
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Paper Abstract

The design, realization and characterization of a new type of laser instrument for non-contact measurement of differential displacements are presented. The operating principle is based on two distinct vibrometers that use semiconductor lasers in the self-mixing interferometric configuration. The differential vibration is obtained by electronic subtraction of the vibration signals supplied by the two channels of the vibrometers. The prototype instrument is made by two compact optical heads (5 cm length, 1 cm diameter) and an electronic unit. The working distance can be varied between 10 and 50 cm, and operation is guaranteed on any diffusive surface. The maximum measurable vibration is in excess of 100 μm, and noise-equivalent differential vibration equals 20 nm. The instrument can be used to measure the differential vibrations of two metal samples kept into contact, revealing the hysteresis cycle in the micro-slip and gross-slip regimes.

Paper Details

Date Published: 17 June 2008
PDF: 5 pages
Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 709814 (17 June 2008); doi: 10.1117/12.803159
Show Author Affiliations
Guido Giuliani, Univ. di Pavia (Italy)
Michele Norgia, Politecnico di Milano (Italy)
Silvano Donati, Univ. di Pavia (Italy)


Published in SPIE Proceedings Vol. 7098:
Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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