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Wavelength Modulating Self-Mixing Interferometer

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Abstract:

Self-mixing interference (SMI) was used to measure the displacement with a resolution of λ/2 by counting the interference signal peaks. In order to increase the measurement accuracy beyond λ/2, sinusoidal wavelength modulation (SWM) technique is introduced in SMI in this paper. Wavelength modulation of the laser beam is obtained by sinusoidal modulating the injection current of the laser diode. Fourier analysis method is proposed to demodulate the phase. Experimentally, the micro-movements of a high precision commercial PZT have been reconstructed, which can obtain a displacement measurement resolution of a few nanometers. It provides a potential displacement sensor with high accuracy and quite compact configuration.

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Info:

Periodical:

Applied Mechanics and Materials (Volume 870)

Pages:

15-20

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.870.15

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Online since:

September 2017

Authors:

Dong Mei Guo*, Hai Qing Jiang

Keywords:

Micro-Displacement Measurement, Self-Mixing Interference, Wavelength Modulation

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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