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Optical Flow Sensor with Fluorescent-Conjugated Hyperelastic Pillar: A Biomimetic Approach
Dongmin Seo1, Seungmin Yoon2, Jaemin Park2
1Department of Electrical and Electronic Engineering, Semyung University, Jecheon 27136, Republic of Korea.
Biomimetics (Basel, Switzerland)
|December 27, 2024
Summary
This study introduces an optical flow sensor inspired by fish neuromasts for precise underwater velocity measurement. It offers a low-power alternative to Doppler systems, enhancing navigation for unmanned undersea vehicles.
Area of Science:
- Biomimetics
- Fluid Dynamics
- Optical Sensing
Background:
- Doppler velocity logs are standard for underwater flow but are power-intensive and inaccurate at low velocities.
- Existing methods struggle with precise near-field flow velocity measurements crucial for underwater robotics.
Purpose of the Study:
- To develop a novel optical flow sensor for accurate low-velocity underwater fluid measurement.
- To mimic fish neuromasts for enhanced sensitivity and performance.
Main Methods:
- Fabricated a sensor using ethylene propylene diene monomer rubber pillars with attached phosphor.
- Measured optical signals via camera and image analysis after applying external force.
- Utilized simulation to analyze flow fields and correlate flow rate with velocity.
Main Results:
- Achieved high improvement rates (99.585% for type A, 99.825% for type B) in elastic recovery characteristics.
- Determined optimal force ranges (0-0.1 N for A, 0-2 N for B) for minimal error.
- Demonstrated a linear relationship between pillar shape and elastic recovery.
Conclusions:
- The proposed optical flow sensor offers a sensitive and accurate method for measuring underwater fluid flow, especially at low velocities.
- This technology can significantly improve navigation and control for underwater unmanned vehicles and robots.
