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• W1989826350 abstract "A method is presented for material discrimination and characterization using bispectral signatures acquired from an object actively probed with acoustic pulses. Although bispectral techniques have proven useful in a diverse array of fields including passive acoustic ranging, bispectral processing in active acoustic applications has not been widely explored. The mechanisms responsible for the bispectral signatures revealed using active acoustics have not been well studied and little is known about the relative contributions to the bispectrum originating in the physical properties of the target material itself rather than from target structural acoustics and the propagation media. In a pilot experiment, we determine bispectral signatures for three targets of differing composition but similar dimensions using a submerged ultrasonic apparatus. The experiment is designed to isolate effects due to target properties from those attributable to propagation path, source, or receiver. The source wavelet is a broad-spectrum linear frequency modulated pulse. The normalized bispectrum is calculated using conventional nonparametic methods, and is averaged across many frames. Results indicate that at ultrasonic frequencies this technique provides signatures with the potential of discriminating between classes of materials such as plastic, metal, and rock. [Work supported by Applied Research Laboratories.]" @default.
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• W1989826350 date "2003-10-01" @default.
• W1989826350 modified "2023-09-27" @default.
• W1989826350 title "Material discrimination using bispectral signatures" @default.
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• W1989826350 doi "https://doi.org/10.1121/1.4779399" @default.
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