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Base on the Fiber Bragg Grating Sensor for Detecting the Residual Capacity of the Lead-acid Battery

Author: ZhouBin
Tutor: ZhaoMingFu
School: Chongqing University of Technology
Course: Signal and Information Processing
Keywords: Lead-acid batteries Remaining capacity Fiber Bragg grating (FBG) Index of refraction Corrosion Phase shift grating
CLC: TM910.7
Type: Master's thesis
Year: 2011
Downloads: 49
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Abstract

In recent years, increasing emphasis on urban air quality, as well as the Earth's oil resources crisis. Within the scope of the world in order to protect the environment, save energy as electrical energy to the battery in the department of transportation, communication and other equipment, has been widely used. In practical applications, due to the charging and discharging of the battery is a complex electrochemical process, although the vendor is more known in its use of the logo on a 10-year float life, due to the simplicity of the charging mode, the battery float life less than half of the claims. The same time, in the practical application, these batteries tend to be a plurality of series. The remaining capacity estimation of electric vehicle battery system developed gradually in depth and to enter the practical stage. Estimate the system and use the remaining battery power, is an important means to effectively extend battery life. The remaining battery power estimation system is not only able to prevent excessive battery discharge or overcharge, but also play an important role in automotive gasoline table for the exercise of electric vehicles. Lead-acid batteries as the research object, starting from the analysis of lead-acid batteries, the electrochemical characteristics, and pointed out that the impact of battery remaining capacity of the various factors and predict the remaining capacity of the difficulty. This article describes the domestic and foreign research progress and the use of the method in the monitoring of battery power, and analyze the advantages and disadvantages of these methods. On this basis, a production (FBG)-based corrosion fiber Bragg grating phase shift grating sensor to predict its electricity. To achieve a detection system based on the one-to-one relationship between the electrolyte concentration and the remaining capacity, using the change in concentration caused by the refractive index change resulting grating wavelength the design principles sensor offset occurs. And ultimately achieve the goal of online testing. Combined with the actual needs of the subject, to make specific works as follows: (1) analysis of the basic working principle of lead-acid batteries, the basic electrical characteristics of lead-acid battery charge and discharge characteristics of the battery capacity and its impact factors; (2) FBG-depth study of the relevant principles and its concentration refractive index sensing principle and fiber evanescent wave principle, the understanding of optical fiber corrosion process to produce corrosion device, a grating corrosion test in preparation for the relevant measurement; (3) experimental research, production sensor and by its own characteristics to eliminate the influence of the temperature on the measured signal; (4), the lead-acid battery for a large number of charge-discharge test, analysis of experimental data, and to prepare for subsequent work; through the theory of the sensor, the working principle and the configuration of analysis , online testing fiber optic sensor system design the remaining capacity of lead-acid batteries. Finally, the system can achieve line measurement of the capacity of lead-acid batteries. The sensor has a measurement is accurate, responsive.

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