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

doi:10.1364/AO.38.001968

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

Engineering Science and Mechanics

Research output: Contribution to journal › Article › peer-review

29 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 language	English (US)
Pages (from-to)	1968-1974
Number of pages	7
Journal	Applied optics
Volume	38
Issue number	10
DOIs	https://doi.org/10.1364/AO.38.001968
State	Published - 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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10.1364/AO.38.001968

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

abstract = "A novel laser speckle velocimeter with two self-mixing laser diodes (SM-LD{\textquoteright}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{\textquoteright}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.",

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AU - Özdemir, Şahin Kaya

AU - Takasu, Tatsuya

AU - Shinohara, Shigenobu

AU - Yoshida, Hirofumi

AU - Sumi, Masao

PY - 1999/4/1

Y1 - 1999/4/1

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AB - 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.

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

Abstract

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