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

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Fabry-Pérot interferometry for long range displacement sensing.

Klaus Thurner¹, Pierre-François Braun, Khaled Karrai

¹attocube systems AG, Königinstraße 11a RGB, 80539 München, Germany.

The Review of Scientific Instruments

|October 5, 2013

Summary

This study explores Fabry-Pérot interferometer configurations for enhanced displacement sensing, achieving wide measurement ranges and angular tolerances for diverse applications.

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Last Updated: May 7, 2026

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

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Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

Optical Engineering
Metrology
Interferometry

Background:

Fabry-Pérot interferometers are crucial for precise measurements.
Optimizing configurations is key for improving displacement sensing capabilities.

Purpose of the Study:

To investigate various optical configurations of low-finesse Fabry-Pérot interferometers for displacement sensing.
To enhance measurement ranges and angular alignment tolerances.
To ensure applicability for targets with varying reflectivity.

Main Methods:

Characterization of working ranges and angular tolerances based on interference contrast.
Utilizing a confocal arrangement for specific performance metrics.
Development of a simulation method incorporating the Airy formula and fiber optic coupling efficiency.

Main Results:

The confocal arrangement demonstrated a measurement range of approximately 0.4 m.
Achieved angular alignment tolerances exceeding ±0.2°.
Interference contrast was used to quantify signal quality and performance.

Conclusions:

Different Fabry-Pérot interferometer configurations offer distinct advantages for displacement sensing.
The developed simulation method accurately predicts optical responses for arbitrary configurations.
Optimized configurations significantly improve measurement range and angular tolerance.