Method of detecting system function by measuring frequency response
First Claim
1. A method for detecting system function of a unit under test by measuring frequency response, the method comprising the steps of:
- (a) selecting a number of frequencies over which the function of the unit under test will be tested;
(b) assembling an excitation time record that is the sum of the sinusoids of the frequencies and a duration of greater than or equal to a period of the lowest selected frequency;
(c) conditioning the excitation time record to be compatible with the unit under test;
(d) exciting the unit under test with the excitation time record and simultaneously capturing a response time record with a data acquisition system;
(e) processing the response time record using the following synchronous detection equations to obtain estimated frequency components of magnitude and phase for one of the selected frequencies;
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Accused Products
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.
29 Citations
4 Claims
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1. A method for detecting system function of a unit under test by measuring frequency response, the method comprising the steps of:
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(a) selecting a number of frequencies over which the function of the unit under test will be tested; (b) assembling an excitation time record that is the sum of the sinusoids of the frequencies and a duration of greater than or equal to a period of the lowest selected frequency; (c) conditioning the excitation time record to be compatible with the unit under test; (d) exciting the unit under test with the excitation time record and simultaneously capturing a response time record with a data acquisition system; (e) processing the response time record using the following synchronous detection equations to obtain estimated frequency components of magnitude and phase for one of the selected frequencies; - View Dependent Claims (2, 3, 4)
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Specification