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Polarimetric heterodyning Bragg-grating fiber-laser sensor
Optics Letters
|October 16, 2009
Summary
We developed a novel fiber-laser strain sensor using Bragg gratings. This sensor accurately measures both linear and torsional strain by analyzing beat frequency changes.
Area of Science:
- Optics and Photonics
- Materials Science
- Sensor Technology
Background:
- Fiber-optic sensors offer advantages in harsh environments.
- Bragg gratings are crucial for wavelength-selective filtering in fiber lasers.
- Polarimetric sensing utilizes light polarization properties for measurement.
Purpose of the Study:
- To demonstrate an active, single-frequency, polarimetric fiber-laser strain sensor.
- To investigate the sensor's response to linear and torsional strain.
- To establish the sensitivity of the sensor for strain measurement.
Main Methods:
- Utilizing a short Bragg-grating fiber-laser design.
- Operating the laser in two orthogonal polarization modes.
- Optically mixing the polarization modes to generate a beat frequency.
- Correlating beat frequency shifts with applied linear and torsional strain.
Main Results:
- The sensor operated effectively as a single-frequency, polarimetric device.
- A linear strain sensitivity of -4.1 MHz/m strain was achieved.
- A torsional strain sensitivity of -0.37 MHz/(deg/cm) was determined.
- The design inherently limited lasing to two orthogonal polarization modes.
Conclusions:
- The developed Bragg-grating fiber-laser sensor is a viable tool for strain measurement.
- The sensor exhibits distinct sensitivities to linear and torsional strain.
- This technology holds potential for structural health monitoring and other applications requiring precise strain detection.
