Low-Patching-Error Fiber Bragg Grating Multi-Dimensional Force Sensor

Area of Science:

• Mechanical Engineering
• Optical Sensing
• Materials Science

Background:

• Traditional fiber Bragg grating (FBG) multi-dimensional force sensors face challenges with patching errors in crossbeam elastic elements.
• Sensitivity changes and measurement inaccuracies limit the performance of existing FBG force sensors.

Purpose of the Study:

• To design and implement an improved FBG multi-dimensional force sensor that overcomes the limitations of traditional designs.
• To enhance the accuracy and reduce the sensitivity change rate of FBG-based force sensors.

Main Methods:

• Application of an equal strength beam structure to the crossbeam elastic element.
• Design and implementation of an improved FBG multi-dimensional force sensor.
• Construction of a calibration testing system for sensor loading and testing.

Main Results:

• The improved elastic body exhibits a significantly reduced sensitivity change rate (11% in X/Y, 35% in Z directions compared to traditional crossbeams).
• Repeatability and hysteresis of the FBG three-dimensional force sensor are within 1% of the full scale (200 N).
• Measurement errors are substantially reduced: 0.27 N (X-direction) and 0.62 N (Z-direction) for the improved sensor, versus 0.9 N and 5.73 N for the traditional sensor.

Conclusions:

• The FBG three-dimensional force sensor based on the improved elastic element demonstrates significantly enhanced measurement accuracy.
• The improved design reduces the requirement for precise sensitive component patching, offering practical engineering implications.
• The findings provide valuable technical references for mass production and performance improvement of multi-dimensional force sensors.