Laser speckle velocimeter using self-mixing laser diode

Author

Shibata, Takaaki ; Shinohara, Shigenobu ; Ikeda, Hiroaki ; Yoshida, Hirofumi ; Sawaki, Toshiko ; Sumi, Masao

Author_Institution

Shizuoka Univ., Hamamatsu, Japan

Volume

45

Issue

2

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

499

Lastpage

503

Abstract

We have built a novel laser speckle velocimeter using a self-mixing laser diode (SM-LD). The speckle signal obtained by the measurement system has a waveform independent of the target velocity when the same path on the target surface is iteratively measured. The mean frequency of the speckle signal is directly proportional to the target velocity when the laser beam spot diameter is kept constant, and greater than 0.36 mm. The mean speckle signal frequency is automatically measured by using a computer. Its measurement error is inversely proportional to the scanned length, and is 2% for 100 mm. It is possible to detect velocity of the target transversely moving across the laser light beam using this compact measuring system

Keywords

laser velocimeters; measurement errors; optical signal detection; semiconductor lasers; speckle; waveform analysis; automatically measured; compact measuring system; laser speckle velocimeter; mean speckle signal frequency; measurement error; self-mixing laser diode; target velocity detection; transversely moving target; waveform processing; Diode lasers; Frequency measurement; Laser beams; Photodiodes; Signal detection; Signal generators; Speckle; Surface emitting lasers; Surface waves; Velocity measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.492775

Filename

492775