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Improved sensitivity in sensor fibers by the proper source/coating selection.

F Romero-Borja, D L Schmidt, L T Wood

|June 26, 2010

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Selecting the right fiber coating and light source is crucial for fiber optic sensors. A short wavelength light source with a hard, elastomeric coating, like nylon, maximizes sensitivity to microbending.

Area of Science:

Optoelectronics
Materials Science
Sensor Technology

Background:

Fiber optic sensors are widely used for various sensing applications.
Optical attenuation in sensor fibers can be influenced by external factors like microbending.
The interaction between fiber coatings and light sources affects sensor performance.

Purpose of the Study:

To investigate the impact of fiber coating and light source characteristics on optical attenuation under microbending.
To determine the optimal combination of light source and fiber coating for enhanced microbending sensitivity in fiber optic sensors.

Main Methods:

Experimental measurement of optical attenuation in sensor fibers subjected to periodic microbending.
Evaluation of the dependence of attenuation on different fiber coatings and spectral characteristics of light sources.

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Analysis of various light source/coating combinations to identify optimal parameters.

Main Results:

The study demonstrates a significant dependence of optical attenuation on the fiber coating material and the light source's spectral characteristics.
A combination of a short wavelength light source and a hard, elastomeric fiber coating was found to be optimal for enhancing sensitivity.
The highest sensitivity to microbending was achieved using a nylon-coated fiber with a He-Ne laser at 632.8 nm.

Conclusions:

The selection of the light source and fiber coating is critical for the design and performance of intensity-modulated microbending fiber optic sensors.
Utilizing a short wavelength light source with a hard, elastomeric coating, such as nylon, significantly enhances sensor sensitivity.
These findings provide valuable guidance for optimizing fiber optic sensor development for microbending detection.