Virtual time reversal acoustics for structural health...

Data processing: structural design – modeling – simulation – and em – Structural design

Reexamination Certificate

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C702S036000, C702S035000

Reexamination Certificate

active

07937248

ABSTRACT:
A method, apparatus, and computer program product for monitoring structures using virtual time reversal signal processing. In one embodiment, a signal having a frequency range is sent into a structure in a vehicle from a fixed transmitter to form an original transmitted signal. A response to the original transmitted signal is received at a fixed sensor associated with the structure to form a received response. The received response is reversed. The reversed response is processed using a transfer function to simulate propagation of the reversed response from the fixed sensor to the fixed transmitter to form a simulated time reversed response. The simulated time reversed response is a simulation of a response of the fixed transmitter to receiving the reversed response from the fixed sensor. The simulated time reversed response is analyzed to monitor for anomalies associated with the structure.

REFERENCES:
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patent: 2008/0319692 (2008-12-01), Davis et al.
Leutenegger et al. “Non-Destructive Testing of Tubes Using a Time Reverse Numerical Simulation (TRNS) Method” Elsevier 2004. See IDS dated Feb. 17, 2009 NPL reference #2.
Wang et al., “A synthetic time-reversal imaging method for structural health monitoring”, Institute of Physics Publishing, Smarter Materials and Structures 13 (2004), U.K., pp. 415-423.
Leutenegger et al., “Detection of defects in cylindrical structures using a time reverse method and a finite-difference approach”, May 2002, pp. 721-725, vol. 40, Issues 1-8, Ultrasonics.
Leutenegger et al., “Non-destructive testing of tubes using a time reverse numerical simulation (TRNS) method”, May 2004, pp. 811-822, vol. 41, Issue 10, Ultrasonics.
USPTO office action for U.S. Appl. No. 11/840,427 dated Nov. 4, 2009.
USPTO office action for U.S. Appl. No. 12/851,408 dated Sep. 23, 2010.

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