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Highly sensitive vector bending sensor based on an embedded multimode D-shaped LPFG.

Xiren Jin, Zihang Xiang, Chupeng Lu

|October 7, 2021

Summary

This summary is machine-generated.

A new D-shaped long period fiber grating sensor precisely measures vector bending. This compact device offers high sensitivity and directionality, making it ideal for advanced bending detection applications.

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Area of Science:

Optoelectronics
Fiber optic sensors
Nanotechnology

Background:

Fiber optic sensors are crucial for precise physical measurement.
Existing sensors often lack the ability to measure bending directionality.
Developing compact, highly sensitive sensors remains an active research area.

Purpose of the Study:

To propose and demonstrate a novel embedded multimode D-shaped long period fiber grating (EMD-LPFG) sensor.
To achieve highly sensitive vector bending measurement.
To investigate the sensor's ability to distinguish bending directions.

Main Methods:

Fabrication of the EMD-LPFG by periodically splicing single mode fiber (SMF) and multimode fiber (MMF).
Utilizing a D-shaped MMF cross-section and CO2 laser for asymmetric refractive index modulation.
Experimental characterization of bending sensitivity and temperature cross-sensitivity.

Main Results:

The sensor demonstrated high bending sensitivity in orthogonal directions: 70.21 nm/m⁻¹ (0°), 9.75 nm/m⁻¹ (90°), -12.04 nm/m⁻¹ (180°), and 9.98 nm/m⁻¹ (270°).
The sensor exhibited a temperature sensitivity of 30 pm/°C within the 25 °C to 75 °C range.
Experimental results closely matched simulation predictions, validating the sensor's performance.

Conclusions:

The proposed EMD-LPFG sensor offers ultra-compact size (2.5 mm) and excellent bending sensitivity.
The sensor's unique design enables accurate vector bending measurement by distinguishing directions.
This novel sensor shows significant potential for various bending measurement applications.