Method of imaging using topologic energy calculation

Details Method of imaging using topologic energy calculation Method of imaging using topologic energy calculation

2006-09-26

2010-02-02

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

C073S625000, C073S628000, C073S598000

Reexamination Certificate

active

07654142

ABSTRACT:
The method for obtaining an image of a part to be inspected includes the steps of determining, by simulation, the ultrasonic field (s0) generated by the propagation of a wave in a flawless reference part; transmitting an ultrasonic wave toward the part to be inspected; measuring the field (um) returned by the part to be inspected; subtracting from the field (um) returned by the part to be inspected an ultrasonic field (u0) obtained from a previous corresponding measurement on the reference part; calculating a variable related to the topological energy (ET) in the reference part on the basis of the field (s0) determined by simulation and of the field (um−u0) obtained by subtraction; and determining the image of the part to be inspected on the basis of the values for this variable.

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Dominguez N., Gibiat V., Arnaud J.L.: “Flaw Imaging with Ultrasound: The Time Domain Topological Gradient Method”—-Review of Quantitative Nondestructive Evaluation, vol. 24, Apr. 9, 2005, pp. 859-866, XP002387991.
Dominguez N. et al.: “Time Domain Topological Gradient and Time Reversal Analogy: An Inverse Method for Ultrasonic Target Detection”—-Wave Motion, North-Holland, Amsterdam, NL, vol. 42, No. 1, Jun. 2005, pp. 31-52, XP004844177.
Prada C. et al.: “Decomposition of the Time Reversal Operator: Detection and Selective Focusing on Two Scatterers”—-Journal of the Acoustical Society of America, AIP/Acoustical Society of America, Melville, NY, US, vol. 99, No. 4, Part 1, Apr. 1, 1996, pp. 2067-2076, XP000599274.

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