Two-dimensional bending vector sensing based on spatial cascaded orthogonal long period fiber

Area of Science:

• Optoelectronics
• Fiber Optics
• Sensor Technology

Background:

• Fiber optic sensors offer advantages in various applications.
• Accurate measurement of bending vector is crucial for many systems.
• Existing fiber vector sensors can be complex and costly.

Purpose of the Study:

• To propose and demonstrate a novel bending vector sensor.
• To establish a three-dimensional orthogonal sensing coordinate system.
• To improve the practicability of fiber vector sensors.

Main Methods:

• Fabrication of spatial cascaded orthogonal long period fiber gratings (SCO-LPFGs) using high-frequency CO2 laser pulses.
• Experimental demonstration of two-dimensional bending vector sensing.
• Establishment of a three-dimensional orthogonal sensing coordinate system for intuitive measurement.

Main Results:

• Successful demonstration of bending vector sensing characteristics.
• Accurate measurement of curvature and bending direction.
• Validation of the three-dimensional orthogonal sensing coordinate system.

Conclusions:

• The proposed SCO-LPFGs sensor offers a simple structure and low cost.
• The sensor enables intuitive solving of curvature and bending direction.
• This technology enhances the practicability of fiber vector sensors.