Parallelized fiber Michelson interferometers with advanced curvature sensitivity plus abated temperature crosstalk

Area of Science:

• Optics
• Fiber Optics
• Sensor Technology

Background:

• Fiber optic sensors are crucial for measuring physical parameters.
• The Vernier effect offers enhanced sensitivity in interferometric sensors.
• Minimizing temperature crosstalk is essential for accurate measurements.

Purpose of the Study:

• To propose and experimentally demonstrate a novel fiber optic curvature sensor.
• To achieve ultra-low temperature crosstalk alongside high curvature sensitivity.
• To leverage the Vernier effect for enhanced sensor performance.

Main Methods:

• Utilized a pair of parallelized 2-core-fiber Michelson interferometers (2CFMIs).
• Introduced a specific rotation angle between the cross-sections of the 2CFMIs.
• Demodulated Vernier envelopes to extract sensing information.

Main Results:

• Achieved a curvature sensitivity of 214.533 nm/m⁻¹.
• Demonstrated ultra-low temperature crosstalk of 0.000276 m⁻¹/°C.
• Verified doubled magnification factor for curvature sensitivity near 180° rotation.

Conclusions:

• The proposed sensor offers superior curvature sensitivity and reduced temperature crosstalk.
• The fabrication process is flexible and repeatable, allowing control over the Vernier effect magnification.
• This technology provides a robust solution for precise curvature sensing applications.