US 11,054,481 B2
Multispectral impedance determination under dynamic load conditions
Jon P. Christophersen, Moscow, ID (US); John L. Morrison, Butte, MT (US); and William H. Morrison, Butte, MT (US)
Assigned to Battelle Energy Alliance, LLC, Idaho Falls, ID (US)
Filed by Battelle Energy Alliance, LLC, Idaho Falls, ID (US)
Filed on Mar. 19, 2019, as Appl. No. 16/357,865.
Prior Publication US 2020/0300920 A1, Sep. 24, 2020
Int. Cl. G01R 31/389 (2019.01); H01M 10/48 (2006.01); G01R 31/392 (2019.01); G01R 31/36 (2020.01)
CPC G01R 31/389 (2019.01) [G01R 31/3648 (2013.01); G01R 31/392 (2019.01); H01M 10/482 (2013.01); H01M 2220/20 (2013.01)] 39 Claims
OG exemplary drawing
 
1. A method of measuring impedance, comprising:
exciting a device under test with a multispectral excitation signal for an excitation time period while the device under test is under a load condition from a load operably coupled to the device under test;
sampling a response of the device under test over a sample time period, wherein the excitation time period is within the sample time period such that the sample time period includes an in-band interval during the excitation time period, and one or more out-of-band intervals outside of the in-band interval;
estimating a load response of the device under test to the load condition during the in-band interval by analyzing samples of the response from the one or more out-of-band intervals;
computing adjusted samples by subtracting the estimated load response during the in-band interval from the samples from the in-band interval; and
estimating an impedance of the device under test by analyzing the adjusted samples.