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Method of detecting system function by measuring frequency response

United States Patent

January 8, 2013
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Method and Apparatus for In-Situ Real Time Characterization of Energy Storage and Energy Conversion Devices
Methods of rapidly measuring an impedance spectrum of an energy storage device in-situ over a limited number of logarithmically distributed frequencies are described. An energy storage device is excited with a known input signal, and a response is measured to ascertain the impedance spectrum. An excitation signal is a limited time duration sum-of-sines consisting of a select number of frequencies. In one embodiment, magnitude and phase of each frequency of interest within the sum-of-sines is identified when the selected frequencies and sample rate are logarithmic integer steps greater than two. This technique requires a measurement with a duration of one period of the lowest frequency. In another embodiment, where selected frequencies are distributed in octave steps, the impedance spectrum can be determined using a captured time record that is reduced to a half-period of the lowest frequency.
Morrison; John L. (Butte, MT), Morrison; William H. (Butte, MT), Christophersen; Jon P. (Idaho Falls, ID), Motloch; Chester G. (Idaho Falls, ID)
Battelle Energy Alliance, LLC (Idaho Falls, ID)
12/ 772,880
May 3, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Contract No. DE-AC07-05ID14517 awarded by the United States Department of Energy. The government has certain rights in the invention.