The Analytic Signal Magnitude for Improved Ultrasonic Signatures

dc.contributor.author	Gammell, Paul
dc.date	2018-02-13T18:40:46.000
dc.date.accessioned	2020-06-30T01:29:36Z
dc.date.available	2020-06-30T01:29:36Z
dc.date.copyright	Thu Jan 01 00:00:00 UTC 1981
dc.date.embargo	2013-12-06
dc.date.issued	1981-08-01
dc.description.abstract	<p>Conventional pulse-echo ultrasonic receivers rectify the received signal. Because the signature of the reflecting interfaces is modulated by the predominant ultrasonic frequency, interpretation of this signal in terms of the structure of the reflecting interfaces is difficult. Smoothing, as by an R-C filter, ameliorates this effect, giving a less confusing display at the expense of resolution. The magnitude of the analytic signal, on the other hand, represents the shape of the energy packets arriving from the reflecting interfaces. Since this signature is free of modulation effects, interpretation of the signal in terms of the reflecting interfaces is more straightforward. Furthermore, smoothing is not normally needed. The analytic signal magnitude can be obtained by several means. The implementation used in this study is particularly suited for digital data processing. The Hilbert Transform of the received signal (the "real part") is obtained with the aid of the Fast Fourier Transform. This produces the quadrature component (the "imaginary part"). The magnitude is calculated from both these components. In contrast to signal processing techniques involving deconvolution, this technique is surprisingly robust with respect to noise and quantization. Typical signatures obtained with this technique are demonstrated.</p>
dc.format.mimetype	application/pdf
dc.identifier	archive/lib.dr.iastate.edu/cnde_yellowjackets_1981/84/
dc.identifier.articleid	1083
dc.identifier.contextkey	4894529
dc.identifier.s3bucket	isulib-bepress-aws-west
dc.identifier.submissionpath	cnde_yellowjackets_1981/84
dc.identifier.uri	https://dr.lib.iastate.edu/handle/20.500.12876/16227
dc.language.iso	en
dc.relation.ispartofseries	Interdisciplinary Program for Quantitative Flaw Definition Annual Reports
dc.source.bitstream	archive/lib.dr.iastate.edu/cnde_yellowjackets_1981/84/1981_YellowJacket_083_Gammell_AnalyticSignal.pdf\|\|\|Sat Jan 15 02:10:45 UTC 2022
dc.subject.disciplines	Materials Science and Engineering
dc.subject.keywords	Nondestructive Evaluation
dc.title	The Analytic Signal Magnitude for Improved Ultrasonic Signatures
dc.type	article
dc.type.genre	16_applications
dspace.entity.type	Publication
relation.isSeriesOfPublication	43920e40-d127-4f4c-9087-dc709815fe7f

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