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Length Measurement by Speckle Velocimeter Using Two Self-Mixing Laser Diodes

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Abstract

Recently, we demonstrated a speckle velocimeter to measure both velocity and length of a moving plate using a self-mixing laser diode (SM-LD).(1),(2) Although the measurement error by the previous velocimeter was 1% for velocity and a few % for length, it requires advance calibration to determine a pair of constants which depend on a beam spot size and material surface to be measured.

© 1998 IEEE

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