NDLI: Life testing of plastic optical fibers for lead-acid battery fast charge equipment

Content Provider	IEEE Xplore Digital Library
Author	Acevedo, J.M. Paz, A. Fernandez-Gomez, S. Soria, M.L.
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. Technol., Univ. of Vigo, Vigo (Acevedo, J.M.; Paz, A.) \|\| I Infinite Loop, Cupertino, CA (Fernandez-Gomez, S.) \|\| Global R&D Centre (Soria, M.L.)
Abstract	Our research has been focused in the past years on the development of efficient fast battery chargers of application to electrical vehicles. One of the challenges that we are facing is selecting adequate sensing components to accurately monitor the charging process, due to the harsh environment in the batteries that use an electrolyte with sulfuric acid $(H_{2}SO_{4})$ at an elevated temperature during the charge process. The sensor must be able to measure the electrolyte density at different places within the battery -density varies with location. The accuracy of the density readout must be maintained through the useful life of the vehicle. In this paper we review our current line of research in fast battery charges as it pertains to their reliability. We present our results on accelerated tests using plastic fiber optics as sensing elements for electrolyte density. The test duration was over one calendar year (9,552 hours) using a sensor with four optical fibers. Three of the optical fibers are used to measure density, and the fourth one as a reference to account for common-mode variation. The charge level of the battery can be derived from this density measurement, as well as the overall health of the battery. For the test, the electrolyte acid density was set to 35%, and the temperature to 70 degrees Celsius. An electronic system for emission and detection of light collected data periodically to assess the transmission loss in the fibers as they aged.
Starting Page	126
Ending Page	131
File Size	593034
Page Count	6
File Format	PDF
ISBN	9781424414604
ISSN	0149144X
DOI	10.1109/RAMS.2008.4925782
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Life testing Plastics Optical fibers Density measurement Optical fiber testing Battery charge measurement Electric vehicles Battery powered vehicles Monitoring Temperature sensors lead-acid battery chargers life testing optical fibers
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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