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

journal contribution
posted on 06.10.2020 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

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of the Optical Society of America A

Publisher

The Optical Society

Version

AM (Accepted Manuscript)

Rights holder

© Optical Society of America

Publisher statement

© 2020 Optical Society of America]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Acceptance date

10/09/2020

ISSN

1084-7529

eISSN

1520-8532

Language

en

Depositor

Prof Jonathan Huntley. Deposit date: 6 October 2020

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