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

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Published on: September 30, 2019

Extended-range fiber polarimetric strain sensor.

R M Taylor, D J Webb, J D Jones

|September 11, 2009

Summary

This summary is machine-generated.

A new frequency-modulation technique enhances fiber polarimetric strain sensors. This method determines optical path differences, extending sensor range by identifying fringe orders in interferometric systems.

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Area of Science:

Optics and Photonics
Sensor Technology
Laser Interferometry

Background:

Fiber optic sensors are crucial for measuring physical parameters.
Interferometric systems offer high sensitivity but face range limitations.
Polarimetric sensors utilize light polarization for measurements.

Purpose of the Study:

To introduce a frequency-modulation technique for two-beam interferometric systems.
To enable precise determination of optical path differences.
To extend the measurement range of fiber polarimetric strain sensors.

Main Methods:

Applying frequency modulation to semiconductor diode laser illumination.
Utilizing a two-beam interferometric setup.
Calculating optical path difference by analyzing interference patterns.

Main Results:

Successfully determined the optical path difference between interferometer arms.
Extended the operational range of a fiber polarimetric strain sensor.
Enabled accurate identification of polarimetric fringe orders.

Conclusions:

The frequency-modulation technique is effective for enhancing interferometric sensor performance.
This method overcomes range limitations in fiber polarimetric strain sensing.
The technique offers a robust solution for precise optical path difference determination.