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Correlation-based speckle velocimeter with self-mixing interference in a semiconductor laser diode.

A K Ozdemir¹, S Ito, S Shinohara

¹Shizuoka University, 3-5-1 Johoku, Hamamatsu-shi 432-8561, Japan.

|March 8, 2008

Summary

This study introduces a new laser diode velocimeter using self-mixing and autocorrelation to measure surface velocity. The method accurately determines speed by analyzing speckle signal fluctuations, achieving low error rates.

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Area of Science:

Optics and Photonics
Metrology
Laser Physics

Background:

Self-mixing laser diodes offer a compact sensing mechanism.
Speckle patterns arise from coherent light scattering off rough surfaces.
Autocorrelation is a signal processing technique for analyzing signal periodicity.

Purpose of the Study:

To develop a novel self-mixing laser diode speckle velocimeter.
To utilize autocorrelation for processing speckle signals.
To establish a method for accurate velocity measurement of moving surfaces.

Main Methods:

A self-mixing laser diode was used to launch and receive light from a moving surface.
Speckle signals generated by back-coupled scattered light were analyzed using autocorrelation.

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A linear relationship between surface velocity and the reciprocal of speckle correlation time was established.

Main Results:

The proposed velocimeter demonstrated a velocity measurement range of 20-450 mm/s.
A measurement error of less than 2% was achieved for an aluminum target at 350 mm/s.
The method relies on the linear correlation between velocity and speckle fluctuation characteristics.

Conclusions:

The self-mixing laser diode speckle velocimeter based on autocorrelation is a viable technique for non-contact velocity measurement.
The method offers a simple and accurate approach to determine surface velocity with proper calibration.
This technique has potential applications in various fields requiring precise motion sensing.