| US 7,487,059 B2 | ||
| Transducer health diagnostics for structural health monitoring (SHM) systems | ||
| Christopher L. Davis, Maple Valley, Wash. (US); Justin D. Kearns, Seattle, Wash. (US); and V. John Mathews, Mercer Island, Wash. (US) | ||
| Assigned to The Boeing Company, Chicago, Ill. (US) | ||
| Filed on Jun. 21, 2007, as Appl. No. 11/766,445. | ||
| Prior Publication US 2008/0319692 A1, Dec. 25, 2008 | ||
| Int. Cl. G06F 19/00 (2006.01) | ||
| U.S. Cl. 702—116 [702/85] | 37 Claims |
| 1. A method for diagnosing the health of a transducer, comprising:
transmitting a signal to a transducer to cause the transducer to transmit a stress wave into an object being monitored, wherein
the signal has a predetermined frequency range;
receiving response data for the transducer;
transforming the response data to data representative of an impedance curve of impedance versus frequency for the predetermined
frequency range;
extracting selected parameters from the impedance curve to diagnose a health of the transducer; and
fitting a plurality of curve portions to the impedance curve at selected narrow-band frequency regimes to determine selected
parameters to diagnose the health of the transducer.
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