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

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Wideband Optical Detector of Ultrasound for Medical Imaging Applications

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Area of Science:

Optoelectronics
Fiber Optic Sensing
Materials Science

Background:

Fiber Bragg gratings (FBGs) are widely used for sensing applications.
Accurate demodulation of dynamic strain is crucial in various engineering fields.
Existing methods may have limitations in bandwidth or sensitivity.

Purpose of the Study:

To develop and characterize a novel FBG dynamic strain sensor system.
To investigate the performance of a distributed feedback (DFB) fiber laser in demodulating FBG wavelength shifts.
To analyze the relationship between FBG linewidth, sensitivity, and detectable strain range.

Main Methods:

Configured a DFB fiber laser and FBG sensors for dynamic strain demodulation.
Utilized FBG sensors as both sensing units and demodulators.
Converted spectral shifts to intensity changes detected by a photodetector.
Investigated directional response and FBG linewidth effects.

Main Results:

The FBG sensor system achieved a detection frequency of up to 300 kHz.
A maximum detectable strain of 29.17 µɛ was recorded with a 0.2 nm linewidth FBG.
Performance was found comparable to piezoelectric transducer sensors.
Maximized directional response occurred when acoustic wave propagation aligned with the optical fiber.

Conclusions:

The proposed DFB fiber laser and FBG system effectively demodulates dynamic strain.
The system offers high-frequency detection capabilities suitable for impact signal analysis.
Understanding the impact of FBG linewidth is key for optimizing sensor performance and strain range.