Surface-Plasmon-Resonance-Based Optical-Fiber Micro-Displacement Sensor with Temperature Compensation.

Area of Science:

• Optoelectronics
• Fiber Optics
• Sensor Technology

Background:

• Micro-displacement measurements are vital in industry.
• Existing optical-fiber sensors suffer from low sensitivity and temperature interference.

Purpose of the Study:

• To propose and demonstrate a novel surface plasmon resonance (SPR)-based optical-fiber micro-displacement sensor.
• To achieve accurate micro-displacement measurements with integrated temperature compensation.

Main Methods:

• Fabricated a sensor with a displacement-sensing region (DSR) using graded-index multimode fiber (GI-MMF) and a temperature-sensing region (TSR) using hetero-core structure fiber.
• Utilized a single-mode fiber (SMF) in the DSR to alter incident beam radial position with displacement.
• Employed polydimethylsiloxane (PDMS) in the TSR as a temperature-sensitive medium.

Main Results:

• The DSR exhibited high sensitivity to displacement (4.24 nm/μm), with resonance wavelength shifts.
• The TSR showed high sensitivity to temperature (-2.485 nm/°C), with resonance wavelength shifts.
• Achieved displacement and temperature detection ranges of 0–25 μm and 20–60 °C, respectively.

Conclusions:

• A novel SPR-based optical-fiber micro-displacement sensor with effective temperature compensation was successfully demonstrated.
• The sensor addresses limitations of existing technologies, offering enhanced precision for industrial applications.