The electrolyte change of lead-acid battery plays a rucial role in the safe operation status of the battery,and the research of implantable sensing technology can help to precisely control the processes such as electrolyte change inside the battery and obtain the real-time working performance and status of the battery online in time,which has important applications in the field of battery safety monitoring.This paper proposed and designed a liquid concentration sensor based on the all-fiber Fabry-Perot interferometer,whose probe consists of two segments single-mode optical fibers and a U-shaped capillary quartz glass tube to form an open FP cavity,which allows the liquid to enter the cavity easily and is not easy to form air bubbles.The structure has the advantages of strong acid and alkali resistance,low intrusion,small size,anti-electromagnetic interference and insulator characteristics,etc.It can be implanted inside the lead-acid battery for real-time online monitoring of sulfuric acid concentration in electrolyte.The results indicate that the effective cavity length of FP cavity and sulfuric acid concentration has good linearity in the range of sulfuric acid concentration from 0 to 30%,and the fitting coefficient reaches 0.995,and the maximum offset between the measured and real values of sulfuric acid concentration is within±1.05%.
关键词
铅酸蓄电池/光纤传感器/光纤FP腔/硫酸体积分数监测
Key words
lead acid battery/fiber sensor/fiber FP cavity/sulfuric acid concentration monitoring
维普
万方数据