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 Ozdemir, Sotetsu Takamiya, Shigenobu Shinohara, Hirofumi Yoshida

Research output: Contribution to journalArticle

10 Citations (Scopus)

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

Fingerprint

Optical Feedback
Velocimeters
Optical feedback
Surface Effects
Semiconductor Lasers
Reproducibility
Speckle
Semiconductor lasers
semiconductor lasers
Autocorrelation
autocorrelation
Linear Relation
Laser Diode
Measurement errors
Measurement System
Measurement Error
Range of data
Light sources
Calibration
Detector

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Applied Mathematics

Cite this

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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.",
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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. / Ozdemir, Sahin; Takamiya, Sotetsu; Shinohara, Shigenobu; Yoshida, Hirofumi.

In: Measurement Science and Technology, Vol. 11, No. 10, 01.01.2000, p. 1447-1455.

Research output: Contribution to journalArticle

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