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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 33 — Nov. 20, 1999
  • pp: 6859–6865

Correlation-Based Speckle Velocimeter with Self-Mixing Interference in a Semiconductor Laser Diode

Şahin Kaya Özdemir, Satoshi Ito, Shigenobu Shinohara, Hirofumi Yoshida, and Masao Sumi  »View Author Affiliations


Applied Optics, Vol. 38, Issue 33, pp. 6859-6865 (1999)
http://dx.doi.org/10.1364/AO.38.006859


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Abstract

We propose a novel self-mixing laser diode speckle velocimeter based on autocorrelation. The self-mixing laser diode launches and receives reflected light from a moving surface that has a random reflection profile. Some portion of the scattered light backcouples into the laser cavity and causes random intensity variations in the form of speckle signals. These speckle signals obtained from a self-mixing laser diode are processed by use of autocorrelation. The linear relation between the velocity and the reciprocal of the correlation time of the speckle intensity fluctuations allows us to determine the velocity easily if proper calibration is performed. The range of the investigated velocity is 20–450 mm/s. For an aluminum target that moves at a velocity of 350 mm/s, the measurement error is less than 2%.

© 1999 Optical Society of America

OCIS Codes
(120.7250) Instrumentation, measurement, and metrology : Velocimetry

Citation
Şahin Kaya Özdemir, Satoshi Ito, Shigenobu Shinohara, Hirofumi Yoshida, and Masao Sumi, "Correlation-Based Speckle Velocimeter with Self-Mixing Interference in a Semiconductor Laser Diode," Appl. Opt. 38, 6859-6865 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-33-6859


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