A high-reliability dual Fabry-Perot cavity vibration sensor with an L-shaped optical path

Area of Science:

• Optoelectronics
• Materials Science
• Mechanical Engineering

Background:

• Fiber-optic sensors offer advantages in harsh environments.
• Fabry-Perot interferometers are sensitive to external stimuli.
• Existing sensors face challenges in reliability and environmental adaptability.

Purpose of the Study:

• To develop a high-reliability fiber-optic Fabry-Perot vibration sensor.
• To enhance sensor adaptability for complex and harsh working conditions.
• To improve deployment flexibility in confined spaces.

Main Methods:

• Constructed dual Fabry-Perot cavities using Inconel 718 and sapphire for temperature self-compensation.
• Implemented an L-shaped optical path for flexible deployment.
• Utilized a reliability packaging design for harsh environments.
• Employed nickel-based alloy Inconel 718 and sapphire materials.

Main Results:

• Achieved a sensitivity of 41.235 nm/g and a resonance frequency of 2372.8 Hz.
• Demonstrated a maximum measurement range of 110.85 g.
• Exhibited stable operation from 25°C to 300°C.
• Showed excellent consistency and stability during temperature cycling and long-term monitoring without drift.

Conclusions:

• The developed sensor provides an effective solution for reliable vibration sensing in complex environments.
• The L-shaped optical path and dual cavities enhance deployment flexibility and temperature self-compensation.
• The reliability packaging design ensures adaptability in high-temperature and corrosive conditions.