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Spatial optical filter sensor based on hollow-core silica tube.

Marta S Ferreira¹, Kay Schuster, Jens Kobelke

¹INESC Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal.

|March 2, 2012

Summary

This study introduces a novel hollow-core silica tube spatial optical filter. This filter demonstrates sensitivity to strain and temperature, making it suitable for extreme condition sensing applications.

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Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Hollow-core fibers offer unique light propagation properties.
Developing robust optical filters for sensing is crucial for harsh environments.

Purpose of the Study:

To propose and characterize a spatial optical filter using a hollow-core silica tube.
To evaluate its performance as a sensing element for physical parameters.

Main Methods:

Fabrication of a hollow-core silica tube spatial optical filter.
Characterization of spectral properties (wavelength range, channel spacing, bandwidth, isolation loss).
Testing the filter's response to strain, temperature, and refractive index variations.

Main Results:

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Achieved a tunable spatial filter from 1200-1700 nm with 2.64 THz channel spacing.
Demonstrated ~30 dB isolation loss and ~0.67 dB/mm optical loss at 1500 nm.
Observed wavelength sensitivity to strain (27.5 pm/°C) and temperature, with optical power dependency for refractive index changes.

Conclusions:

The hollow-core silica tube filter functions as a sensitive element for strain and temperature.
Its robustness and sensitivity make it ideal for sensing in extreme environments, including high temperatures.