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Related Experiment Video

Updated: Jun 4, 2026

Implementation of a Reference Interferometer for Nanodetection
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Published on: April 26, 2014

Laser frequency noise immunity in multiplexed displacement sensing.

Danielle M R Wuchenich1, Timothy T-Y Lam, Jong H Chow

  • 1Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, Australian Capital Territory, Australia. danielle.wuchenich@anu.edu.au

Optics Letters
|March 4, 2011
PubMed
Summary

Digitally enhanced interferometry (DI) isolates and measures multiple signals simultaneously, overcoming conventional interferometry limitations. This technology enables precise, real-time monitoring of object displacements and strain with high sensitivity.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Sensing Technologies

Background:

  • Conventional interferometry faces signal interference, degrading performance in displacement monitoring.
  • Distinguishing between interferometric signals and object displacement is challenging.

Purpose of the Study:

  • To demonstrate the signal multiplexing capabilities of digitally enhanced interferometry (DI).
  • To achieve simultaneous, high-sensitivity monitoring of in-line object displacements.
  • To showcase DI's application in multi-point optical fiber sensing.

Main Methods:

  • Experimental implementation of digitally enhanced interferometry (DI).
  • Simultaneous measurement of interferometric signals and object displacements.
  • Multiplexed length sensing of three distinct sections of an optical fiber.

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Related Experiment Videos

Last Updated: Jun 4, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Published on: November 22, 2019

Main Results:

  • Successful isolation and simultaneous measurement of multiple interferometric signals.
  • Achieved subnanometer displacement sensitivity with a noise floor of 200 pm/√Hz.
  • Demonstrated low cross-talk (<2.6×10⁻³) and high strain sensitivity (<80 pε) in multi-section fiber sensing.
  • Enhanced low-frequency displacement sensitivity by mitigating laser frequency noise.

Conclusions:

  • Digitally enhanced interferometry (DI) effectively separates and measures multiple signals, overcoming conventional limitations.
  • DI enables simultaneous, high-sensitivity displacement monitoring and multiplexed sensing applications.
  • The demonstrated system offers a robust solution for precise strain sensing in optical fibers.