Boots – shoes – and leggings
Patent
1988-11-14
1990-05-01
Ruggiero, Joseph
Boots, shoes, and leggings
36441313, 378901, G06F 1542
Patent
active
049224212
ABSTRACT:
Flaw uniform density location and size for flaws smaller than the beam diameter of an ultrasound beam are determined by measurement of return echos of ultrasound. The return echos are transformed to Fourier space and are normalized to take away any dependence upon factors other than the flaw in the object under test. The Fourier space representation of the return echo after normalization is dependent on a flaw characteristic function. The flaw characteristic function is repeatedly transformed between object space and Fourier space in order to eliminate or minimize errors in the flaw characteristic function. In frequency or Fourier space, the flaw characteristic function is reset to take into account the known Fourier components derived from the return echo waveforms, whereas the object space flaw characteristic function is corrected to take into account the fact that the flaw characteristic function has only two values, 0 and 1.
REFERENCES:
patent: 4506327 (1985-03-01), Tam
Tam, "Two-Dimensional Inverse Born Approximation in Ultrasonic Flaw Characterization", 1985.
Tam et al., "Limited Angle Three Dimensional Reconstruction Using Fourier Transform Iterations and Radon Transform Iterations", 1981.
Beulick John S.
Bui Kim Thanht
Davis Jr. James C.
General Electric Company
Ruggiero Joseph
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