Simultaneous measurement of velocity and length of moving surfaces by a speckle velocimeter with two self-mixing laser diodes

Şahin Kaya Özdemir, Tatsuya Takasu, Shigenobu Shinohara, Hirofumi Yoshida, Masao Sumi

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A novel laser speckle velocimeter with two self-mixing laser diodes (SM-LD’s) for velocity and length measurements of moving surfaces is reported. The mean frequency of the speckle signal obtained in the measurement system depends on the surface path illuminated by the SM-LD. This behavior of the speckle signal in the SM-LD’s is exploited to detect the front and the end edges of a target surface by sampling continuously the number of intensity changes in a speckle signal waveform. Once the edges are determined, the velocity and the length of the surface are calculated easily. The error for length and velocity measurements of a target with a homogeneous rough plane surface of 60-mm length, moving at a velocity of 200 mmys, can be as low as 2.1% and 1.75%, respectively.

Original languageEnglish (US)
Pages (from-to)1968-1974
Number of pages7
JournalApplied optics
Volume38
Issue number10
DOIs
StatePublished - Apr 1 1999

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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