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Related Experiment Video

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Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Optical flowmeter using a modal interferometer based on a single nonadiabatic fiber taper.

O Frazão¹, P Caldas, F M Araújo

¹INESC Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal. ofrazao@inescporto.pt

|July 17, 2007

Summary

A novel fiber optic sensor uses a fused taper and Fresnel reflection to create a channeled spectrum. This device is demonstrated as an effective fiber optic flowmeter sensor.

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Area of Science:

Optics and Photonics
Fiber Optic Sensors
Interferometry

Background:

Fiber optic sensors offer advantages in harsh environments.
Modal interferometers are sensitive to external perturbations.
Fused fiber tapers enable light coupling between fiber modes.

Purpose of the Study:

To present a novel in-fiber modal interferometer.
To demonstrate its application as a fiber optic flowmeter sensor.

Main Methods:

Fabrication of a nonadiabatic biconical fused taper.
Coupling light between the cladding and core.
Utilizing Fresnel reflection at the fiber end.

Main Results:

The fiber structure returned light with a channeled spectrum.
The spectrum resembled that of a two-wave Michelson interferometer.
Successful demonstration as a fiber optic flowmeter sensor.

Conclusions:

The proposed in-fiber modal interferometer is a viable sensor configuration.
This sensor exhibits a channeled spectrum suitable for sensing applications.
The device shows promise for flowmeter sensing applications.