FBG-Based Strain Sensing for Low-Weight Measurement Applications

Accurate low-weight measurement is essential for industrial, biomedical, and scientific applications. This article presents the design and development of a fiber Bragg grating (FBG)-assisted low-weight measurement system. Leveraging their high sensitivity to strain and temperature, FBG-based sensors are employed for the precise detection of applied loads. The strain induced by the applied weight causes a Bragg wavelength shift, which is utilized to quantify the weight. The dimensions of the load cell are optimized using a finite element method (FEM) based on COMSOL to maximize strain generation and enhance the sensitivity of the system. The proposed design achieves a sensitivity of 0.0389 pm/g. Experimental validation confirms the high accuracy, excellent repeatability, and low hysteresis loss of the developed optical load cell, demonstrating its potential for reliable low-weight measurement applications.