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

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Random gratings as correlator sensors.

J Ojeda-Castañeda, A Sauceda

|March 1, 1997

Summary

Random gratings, periodic structures with random variations, exhibit unique autocorrelation peaks. These features show potential for developing advanced holographic sensors for detecting lateral displacements and phase gradients.

Area of Science:

Optics and Photonics
Materials Science

Background:

Random gratings are periodic structures with random variations in their unit cells.
Their autocorrelation function exhibits distinct periodic peaks due to this randomness.
These properties suggest potential applications in advanced sensing technologies.

Purpose of the Study:

To experimentally verify the potential of random gratings for holographic sensor applications.
To demonstrate the utility of their unique autocorrelation properties for displacement and phase-gradient detection.

Main Methods:

Fabrication of random gratings with controlled random variations.
Characterization of the autocorrelation function of the fabricated gratings.
Experimental implementation and testing of holographic sensors utilizing these gratings.

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Main Results:

The experimental verification confirmed the presence of high periodic peaks in the autocorrelation function of random gratings.
The study successfully demonstrated the feasibility of using random gratings in holographic sensors.
Effective detection of in-plane lateral displacements and phase gradients was achieved.

Conclusions:

Random gratings offer a promising platform for novel holographic sensor development.
The unique autocorrelation properties of random gratings are validated for practical sensing applications.
This work represents the first experimental verification of random gratings for holographic sensing.