Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers.

Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers. Research Abstract Details 

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Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers. Abstract Text:

K D Donohue,

The author derives a maximum-likelihood estimator (MLE) for A-scan amplitudes corresponding to coherent reflectors embedded in media of unresolvable scatterers. The MLE processes sampled RF A-scans from broadband ultrasonic pulse-echo systems. A major source of interference for these signals is the backscattered energy from the unresolvable scatterers that exist throughout the beam field. A statistical model is formulated that characterizes the backscattered energy from a resolution cell when a coherent target scatterer is present. It is shown that the MLE is equivalent to a matched filter when the distribution of the interfering back-scatter energy is stationary over the resolution cell. In addition, the form of the MLE is described when the interfering echoes are not stationary within the resolution cell. Experimental results are presented for an adaptive implementation of the MLE applied to flaw detection in stainless steel. The results demonstrate the ability of the MLE to reveal targets masked by grain echoes, without prior knowledge of the gain-echo spectral characteristics.

Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers. Publishing Authors By Initials

KD Donohue,

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Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: IEEE transactions on ultrasonics, ferroelectrics,

VOLUME: 39

Page Numbers: 422-31

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ISSN: 0885-3010

DAY: 12

MONTH: 02

YEAR: 1992

Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers. Information

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LANGUAGE: eng

NlmUniqueID: 9882735

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Grant and Affiliation Information for Maximum likelihood estimation of A-scan amplitudes for coherent targets in media of unresolvable scatterers.

AFFILIATION: Dept. of Electr. Eng., Kentucky Univ., Lexington, KY.

Country: United States

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MEDLINETA: IEEE Trans Ultrason Ferroelect

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