Simultaneous range and velocity measurement using a frequency shifted feedback laser

Laser Doppler velocimeters (LDVs) are non-contact sensors for measuring velocity, and generally used for measuring length of steel products. However, the distance range of the measurement target is restricted to a certain region in principle, making it difficult to measure the velocity of steel prod...

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Bibliographic Details
Published inMeasurement. Sensors Vol. 24; p. 100424
Main Authors Oshima, Shinichi, Isei, Yoshito
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2022
Elsevier
Subjects
FSFL
Laser
Rangefinder
Velocimeter
FSFL
Velocimeter
Laser
Rangefinder
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Summary:Laser Doppler velocimeters (LDVs) are non-contact sensors for measuring velocity, and generally used for measuring length of steel products. However, the distance range of the measurement target is restricted to a certain region in principle, making it difficult to measure the velocity of steel products with large distance fluctuations. To remove this restriction, a frequency-shifted feedback laser range and velocity meter (FSFL-RVM) was developed with an FSFL whose frequency changes proportionally with time at ultra-high speeds. This new sensor can measure the velocity without this restriction and additionally measure the distance without contact. The measurement accuracy was evaluated experimentally, and its measurement principle was verified. As a result, it was confirmed that its ability to measure velocities with the same accuracy as the LDV in a distance range five times that of the LDV and simultaneously measure distances within an accuracy of 0.1 mm.
ISSN:2665-9174
2665-9174
DOI:10.1016/j.measen.2022.100424