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Updated: Jan 22, 2026

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
Published on: February 3, 2023
Fabry-Perot cavity-based contact force sensor with high precision and a broad operational range.
A novel micro-fiber optic sensor offers precise contact force measurement. This compact, robust device is ideal for biomedical and robotic applications requiring high sensitivity and accuracy.
Area of Science:
- Fiber Optic Sensors
- Micro-Optics
- Biomedical Engineering
Background:
- Accurate contact force sensing is critical for minimally invasive surgery and advanced robotics.
- Existing sensors often face limitations in size, robustness, or sensitivity.
Purpose of the Study:
- To propose and characterize a novel, compact, and robust contact force sensor.
- To demonstrate its sensing capabilities across a wide force range with high sensitivity.
Main Methods:
- Fabrication of a micro-length single-mode fiber (SMF) sensor within a micro-air cavity (MAC).
- Utilizing the displacement of the SMF within the MAC for force transduction.
- Characterization of sensor performance, including sensitivity, temperature dependence, and linearity, verified by Finite Element Method (FEM) analysis.
Main Results:
- The sensor exhibits a maximum force sensitivity of 14.2 pm/mN.
- Negligible temperature dependence (0.4 pm/°C) and minimal hysteresis and repeatability errors.
- Demonstrated effective sensing across both low (0-1000 mN) and high (1-10 N) force ranges.
Conclusions:
- The developed all-silica fiber optic sensor is compact, robust, and bend-proof.
- Its high sensitivity, linearity, and minimal error make it suitable for demanding biomedical and robotic applications.
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