Fiber Bragg grating-based measurement of random-rotation parameters

Area of Science:

• Optoelectronics
• Mechanical Engineering
• Sensor Technology

Background:

• Traditional rotational sensors face limitations in angle measurement and range.
• Developing precise and versatile rotational sensing systems is crucial for various engineering applications.

Purpose of the Study:

• To propose and experimentally demonstrate a novel preloaded rotational sensor utilizing fiber Bragg gratings.
• To evaluate the sensor's capability in converting strain information into rotation angles and measuring rotational velocity and acceleration.

Main Methods:

• A fiber Bragg grating-based sensor was designed with a spring-loaded magnetic head.
• A mathematical model was developed to describe the conversion of strain to rotation angles.
• Experimental validation was performed to assess accuracy, linearity, and range.

Main Results:

• The sensor successfully converted strain to rotation angles, fitting random displacements with a maximum deviation of 0.5°.
• High linearity (up to 0.998) was achieved for calculated rotational velocity in the range of 0 to 2021.4 rpm.
• The system demonstrated potential for angular acceleration measurement.

Conclusions:

• The proposed fiber Bragg grating rotational sensor offers a robust solution for angle and velocity measurement without inherent angle limitations.
• The sensor exhibits high accuracy and linearity, making it suitable for demanding rotational sensing applications.
• This technology has potential applications in measuring angular acceleration, broadening its utility.