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Remote displacement measurement using a passive interferometer with a fiber-optic link.

¹NASA Lewis Research Center, Cleveland, Ohio 44135, USA.

|August 1, 1985

Summary

This study demonstrates remote displacement measurement using a Fabry-Perot cavity and multimode fiber optics. The system achieves sub-nanometer precision for precise length tracking in optical sensing applications.

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Area of Science:

Optical Physics
Metrology
Fiber Optic Sensing

Background:

Accurate remote displacement measurement is crucial for various scientific and industrial applications.
Traditional methods can be limited by environmental factors, optical losses, and dynamic range.

Purpose of the Study:

To demonstrate a novel remote displacement measurement technique.
To achieve high-precision tracking of cavity length using a multimode optical fiber link.

Main Methods:

Utilized a Fabry-Perot sensing cavity whose length modulates the spectrum of a light-emitting diode (LED).
Employed a tunable reference cavity to analyze the returning light signal via the fiber link.
Implemented a closed-loop control system for precise tracking of the sensing cavity length.

Main Results:

Achieved sub-picometer tracking precision (2 x 10^-12 m) for the sensing cavity length.
Demonstrated a displacement measurement range of 2 x 10^-6 m.
Validated the technique's compatibility with standard multimode fiber-optic components.

Conclusions:

The proposed Fabry-Perot cavity sensor offers high immunity to optical losses.
This method provides a large dynamic range for remote displacement sensing.
The technique is suitable for applications requiring precise, remote optical metrology.