Weighing system with ordinary load cell and a multimode fiber

摘要

In this paper, the theoretical and practical background for the development of a highly stable and sensitive weighing system is discussed .The loaded end of a load cell will undergo bending and this change in dimension is measured as "strain" using strain gauges fixed to the load cell. This scheme needs precise electronic arrangements to make up for the inherent variations of the strain gauge. In the present work, the deflection of the loaded end of a cantilever is measured as an axial misalignment between two multimode fiber end faces. The optical power coupled to the receiving fiber is proportional to the deflection of the loaded end of the load cell. This can be easily detected by simple and effective optical detection methods.