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Adaptive delay lines for absolute distance measurements in high-speed long-range frequency scanning interferometry

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posted on 04.02.2021, 11:45 authored by Christos Pallikarakis, Jonathan Huntley, Pablo RuizPablo Ruiz
The application of Frequency Scanning Interferometry to long-range (∼10 m) highspeed (upwards of 105 coordinates s-1) absolute distance measurement is currently impractical at reasonable cost due to the extremely high modulation frequencies (typically 100 GHz or more). A solution is proposed here based on an Adaptive Delay Line architecture, in which the reference beam passes through a series of N switchable delay lines, with exponentially-growing delays. The benefits include a reduction by a factor of 2𝑁 in the required signal sampling rate, in the size of dataset to be processed, and in minimum allowable source coherence length, thus paving the way for the use of fast sweeping sources such as vertical-cavity surface-emitting lasers (VCSELs) and Fourier-domain mode-locked (FDML) lasers for long-range lidars. The validity of the principle has been demonstrated experimentally by means of a three-switch prototype.

Funding

Future Advanced Metrology Hub

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

OSA Continuum

Volume

4

Issue

2

Pages

428 - 436

Publisher

Optical Society of America

Version

VoR (Version of Record)

Rights holder

© Optical Society of America

Publisher statement

This is an Open Access Article. It is published by the Optical Society of America under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

15/11/2020

Publication date

2021-01-28

Copyright date

2021

ISSN

2578-7519

Language

en

Depositor

Prof Jonathan Huntley. Deposit date: 19 December 2020

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