A speckle velocimeter using a semiconductor laser with external optical feedback from a moving surface: Effects of system parameters on the reproducibility and accuracy of measurements

Sahin Kaya Özdemir, Sotetsu Takamiya, Shigenobu Shinohara, Hirofumi Yoshida

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

A speckle velocimeter exploiting the effects of external optical feedback in a semiconductor laser is analyzed. The laser diode is used both as the light source and as the detector making the system self-detecting and self-aligning with a single optical axis. The velocimeter employs an autocorrelation method to analyze the detected self-mixing speckle signal. The linear relation between the velocity and the reciprocal of the autocorrelation time of fluctuations in the amplitude of the speckle signal allows the determination of the velocity. Effects of various parameters of the measurement system are analyzed and the dependences of the reproducibility and accuracy of the measurements on these parameters are discussed in order to achieve optimization of the system. The optimized system has a measurement error of less than 1.4% within the range of calibration velocities and less than 2.7% outside this range.

Original languageEnglish (US)
Pages (from-to)1447-1455
Number of pages9
JournalMeasurement Science and Technology
Volume11
Issue number10
DOIs
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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