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High-speed range and velocity measurement using frequency scanning interferometry with adaptive delay lines

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journal contribution
posted on 06.10.2020, 13:33 by Christos Pallikarakis, Jonathan Huntley, Pablo Ruiz
Range (i.e., absolute distance), displacement and velocity of a moving target have been measured with a Frequency Scanning Interferometer that incorporates a 100,000 scan s-1 VCSEL laser with 100-nm tuning range. An Adaptive Delay Line in the reference beam, consisting of a chain of switchable exponentially-growing optical delays, reduced modulation frequencies to sub-GHz levels. Range, displacement and velocity were determined from the phase of the interference signal; fine alignment and linearization of the scans was achieved from the interferogram of an independent reference interferometer. Sub-nm displacement resolution, sub-100-nm range resolution, and velocity resolution of 12 μm s-1 have been demonstrated over a depth measurement range of 300 mm.

Funding

Future Advanced Metrology Hub

Engineering and Physical Sciences Research Council

Find out more...

EP/P006930/1

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of the Optical Society of America A

Volume

37

Issue

11

Pages

1814 - 1825

Publisher

The Optical Society

Version

VoR (Version of Record)

Rights holder

© The Author(s)

Publisher statement

Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Acceptance date

08/09/2020

Publication date

2020-10-27

Copyright date

2020

ISSN

1084-7529

eISSN

1520-8532

Language

en

Depositor

Prof Jonathan Huntley. Deposit date: 6 October 2020

Licence

Exports