Method of detecting system function by measuring frequency response
Abstract
Real time battery impedance spectrum is acquired using one time record, Compensated Synchronous Detection (CSD). This parallel method enables battery diagnostics. The excitation current to a test battery is a sum of equal amplitude sin waves of a few frequencies spread over range of interest. The time profile of this signal has duration that is a few periods of the lowest frequency. The voltage response of the battery, average deleted, is the impedance of the battery in the time domain. Since the excitation frequencies are known, synchronous detection processes the time record and each component, both magnitude and phase, is obtained. For compensation, the components, except the one of interest, are reassembled in the time domain. The resulting signal is subtracted from the original signal and the component of interest is synchronously detected. This process is repeated for each component.
 Inventors:
 Issue Date:
 Research Org.:
 Idaho National Lab. (INL), Idaho Falls, ID (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1245956
 Patent Number(s):
 7395163
 Application Number:
 11/825,629
 Assignee:
 Montana Tech of the University of Montana (Butte, MT)
 Patent Classifications (CPCs):

G  PHYSICS G01  MEASURING G01R  MEASURING ELECTRIC VARIABLES
 Resource Type:
 Patent
 Resource Relation:
 Patent File Date: 2007 Jul 05
 Country of Publication:
 United States
 Language:
 English
 Subject:
 97 MATHEMATICS AND COMPUTING; 36 MATERIALS SCIENCE; 25 ENERGY STORAGE
Citation Formats
Morrison, John L., and Morrison, William H. Method of detecting system function by measuring frequency response. United States: N. p., 2008.
Web.
Morrison, John L., & Morrison, William H. Method of detecting system function by measuring frequency response. United States.
Morrison, John L., and Morrison, William H. Tue .
"Method of detecting system function by measuring frequency response". United States. https://www.osti.gov/servlets/purl/1245956.
@article{osti_1245956,
title = {Method of detecting system function by measuring frequency response},
author = {Morrison, John L. and Morrison, William H.},
abstractNote = {Real time battery impedance spectrum is acquired using one time record, Compensated Synchronous Detection (CSD). This parallel method enables battery diagnostics. The excitation current to a test battery is a sum of equal amplitude sin waves of a few frequencies spread over range of interest. The time profile of this signal has duration that is a few periods of the lowest frequency. The voltage response of the battery, average deleted, is the impedance of the battery in the time domain. Since the excitation frequencies are known, synchronous detection processes the time record and each component, both magnitude and phase, is obtained. For compensation, the components, except the one of interest, are reassembled in the time domain. The resulting signal is subtracted from the original signal and the component of interest is synchronously detected. This process is repeated for each component.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {7}
}
Works referenced in this record:
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conference, January 1999
 Smith, R.; Banaszuk, A.; Dullerud, G.
 Decision and Control, 1999. Proceedings of the 38th IEEE Conference on
Accurate method of representation of highvoltage measuring systems and its application in highimpulsevoltage measurements
journal, March 1989
 Nikolopoulos, P. N.; Topalis, F. V.
 IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education), Vol. 136, Issue 2, p. 6672