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

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Sensitivity enhanced vector accelerometer based on FBG-FP inscribed on multicore fiber.

Jiaojiao Wang, Fengyi Chen, Rui Zhou

|February 23, 2023

Summary

Researchers developed a novel fiber Bragg grating Fabry-Perot accelerometer. This high-sensitivity vector vibration sensor achieves significantly improved acceleration sensitivity and resonant frequency for precise motion detection.

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Area of Science:

Optoelectronics
Fiber Optic Sensors
Vibration Measurement

Background:

Traditional accelerometers face limitations in sensitivity and frequency response.
Fiber optic sensing offers potential for enhanced performance in vibration measurement.

Purpose of the Study:

To propose and fabricate a high-sensitivity vector vibration accelerometer.
To investigate the performance enhancement of a multicore fiber Bragg grating Fabry-Perot (FBG-FP) structure.

Main Methods:

Fabrication of a novel FBG-FP structure using multicore fiber.
Characterization of acceleration sensitivity and resonant frequency before and after packaging.
Exploitation of multicore fiber asymmetry for vector sensing.

Main Results:

The packaged FBG-FP accelerometer achieved a sensitivity of 6.89 V/g, a 45.9-fold increase over the bare FBG.
The resonant frequency was improved from 30 Hz to 86 Hz.
Demonstrated capability for high-sensitivity two-dimensional vector acceleration sensing.

Conclusions:

The developed FBG-FP accelerometer offers significantly enhanced sensitivity and resonant frequency.
The unique structure enables high-performance vector vibration sensing.
This technology holds promise for advanced motion detection applications.