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Distorted Acquisition of Dynamic Events Sensed by Frequency-Scanning Fiber-Optic Interrogators and a Mitigation

Hari Datta Bhatta¹, Roy Davidi¹, Arie Yeredor¹

¹School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel.

Sensors (Basel, Switzerland)

|March 26, 2022

Summary

Fiber-optic dynamic interrogators can distort signals by assigning non-uniform samples to a uniform time grid. Reporting acquisition times allows interpolation to significantly reduce these distortions, improving signal recovery.

Keywords:

distortion mitigation fiber-optic sensing harmonic distortion non-uniform sampling post-processing technique

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Last Updated: Sep 29, 2025

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Published on: May 11, 2014

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Published on: March 20, 2017

Area of Science:

Optical Engineering
Signal Processing
Fiber Optics

Background:

Fiber-optic dynamic interrogators use periodic frequency scanning.
These systems sample time-varying measurands on a non-uniform time grid.
Reported data is often assigned to a uniform time grid, synchronized with scanning.

Purpose of the Study:

To highlight signal distortions caused by assigning non-uniform samples to a uniform time grid.
To investigate the factors influencing these distortions.
To propose a method for mitigating signal distortion in dynamic interrogators.

Main Methods:

Simulative analysis of signal distortion in fiber-optic dynamic interrogators.
Experimental verification using a commercial dynamic interrogator and a Brillouin Optical Time Domain Analysis (BOTDA) setup.
Application of spline interpolation using measurand-dependent sampling instants.

Main Results:

Artificial assignment to a uniform time grid causes significant signal distortions.
Distortions increase with signal frequency and measurand dynamic range.
Spline interpolation using acquisition instants significantly reduces distortion, yielding cleaner signal recovery.

Conclusions:

Manufacturers should report sampled values with their acquisition instants.
Interpolation algorithms can substantially reduce distortions caused by non-uniform sampling.
Accurate time-stamping and interpolation are crucial for reliable fiber-optic dynamic interrogator data.