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초록

Load cell is one of the most fundamental measuring instruments in many application fields. Generally, common load cells are based on the demodulation principle using electric strain gages (ESGs). However, many electric sensors including ESGs are easily influenced by electro-magnetic interference (EMI), which causes measurement errors. For the reason, the necessity of load cells that are immune to EMI is gradually increasing. Fiber optic sensors, especially fiber Bragg grating (FBG) sensors are widely used for various applications because of good multiplexing capabilities and also have many advantages such as wide temperature ranges, small size and immunity to EMI. In this paper, one-axis load cell is manufactured using FBG sensors and verified through a tensile test on a universal testing machine. From the experimental results, it was successfully demonstrated that FBG sensors can be a good counterproposal for sensing elements of load cells.