Low-Cost Angle Sensor for Robotics Applications Using Plastic Optical Fiber Based on Optical Loss Mechanism

Area of Science:

• Robotics and Sensor Technology
• Biomimetic Engineering
• Materials Science

Background:

• Robotic and human joint structures require precise angle measurement.
• Current angle sensors (encoders, strain gauges) face limitations in harsh environments like underwater or areas with electromagnetic interference (EMI).
• Existing sensors are often not cost-effective or durable enough for demanding applications.

Purpose of the Study:

• To develop and evaluate a novel angle sensor based on step-index profile plastic optical fiber (SI-POF).
• To overcome the limitations of conventional angle measurement sensors in extreme environments.
• To demonstrate the reliability and practicality of SI-POF angle sensors for robotic applications.

Main Methods:

• Experimental measurement of light loss in SI-POF sensors due to angle and gap changes on a robot arm.
• Simulation of combined light loss effects.
• Performance evaluation of the SI-POF sensor, including sensitivity and resolution.
• Comparative analysis against traditional encoders in extreme conditions (underwater, EMI).

Main Results:

• Quantified light loss in SI-POF sensors correlated with angle and gap variations.
• Demonstrated sensor performance metrics (sensitivity, resolution).
• Confirmed reliability and practicality of SI-POF sensors through comparative verification against encoders in challenging environments.

Conclusions:

• SI-POF angle sensors provide a cost-effective and durable solution for precise angle measurement.
• The developed sensor is reliable in extreme environments, including underwater and high EMI conditions.
• POF-based angle sensors hold significant potential for advancing robotics, particularly in specialized applications where conventional sensors fail.