Title :
Speckle velocimeter with a self-mixing laser diode: optimization of measurement system, reproducibility and accuracy of measurements
Author :
Özdemir, S.K. ; Takamiya, S. ; Shinohara, S. ; Yoshida, H. ; Sumi, M.
Author_Institution :
Shizuoka Univ., Hamamatsu, Japan
Abstract :
A self-mixing laser diode speckle velocimeter based on autocorrelation of speckle signals is analyzed in detail. In this velocimeter scheme, a semiconductor laser is used both as the source and the detector enabling a self detecting, self-aligning system with a single optical axis. Effects of different parameters (beam spot size, measurement time, etc) of the measurement system are analyzed and the system was optimized for the best accuracy and reproducibility of the measurements. The optimized system has a measurement error less than 1.5% within the range of calibration velocities and less than 3% out of this range
Keywords :
calibration; laser velocimeters; measurement by laser beam; measurement errors; semiconductor lasers; speckle; accuracy; autocorrelation; beam spot size; calibration velocities; measurement error; measurement system; measurement time; reproducibility; self-aligning system; self-mixing laser diode; single optical axis; speckle velocimeter; Adaptive optics; Autocorrelation; Diode lasers; Laser beams; Reproducibility of results; Semiconductor lasers; Signal analysis; Size measurement; Speckle; Time measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-5890-2
DOI :
10.1109/IMTC.2000.848830
