Ultrasonic Transducers for Materials Testing and Their Characterization

Sachse, Wolfgang; Hsu, N. N.

doi:10.1016/b978-0-12-477914-3.50009-8

Cited by 62 publications

(40 citation statements)

References 220 publications

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“…EXPERH1ENTAL RESULTS Figure 1 is the experimental signal generated by breaking a glass capillary (0.05 mm ID and 0.08 mm OD) on top of a 1/4" thick glass plate and detected by a 1/4" diameter capacitive transducer. Previous work has shown that a capacitive transducer can respond as a displacement sensor [3] and it is useful for the quantitative characterization of AE sources [4,5,6]. To the authors' knowledge, in none of the published work has removal of the aperture effect been considered.…”

Section: Recovery Of Source Tihe Functionmentioning

confidence: 73%

Separation of Spatial and Temporal Effects in an Ultrasonic Transducer

Chang¹,

Sachse²

1986

Review of Progress in Quantitative Nondestructive Evaluation

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This paper focuses on the separation of the smoothing effect of a signal caused by a finite-size transducer and that by an emission source of finite bandwidth.The total output response of a transducer as a receiver is a superposition of these two effects, resulting in a waveform whose frequency response is determined by the product of the spectrum of the excitation, the structure Green's function and the equivalent spectrum of the transducer's aperture.The true time function of a source can only be recovered by separating the aperture effect from the detected signal. Results are demonstrated with experimental data determined with capacitive transducers of varying apertures detecting signals on plates of various thicknesses.

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Section: Recovery Of Source Tihe Functionmentioning

confidence: 73%

Separation of Spatial and Temporal Effects in an Ultrasonic Transducer

Chang¹,

Sachse²

1986

Review of Progress in Quantitative Nondestructive Evaluation

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“…The performance of each subsystem is assessed independently. The measurement procedures described allow the following properties to be determined: (Sachse and Hsu 1979;O'Donnell, Busse and Miller, 1980;Lidington and Silk 1972;Papadakis 1977).…”

Section: Discussionmentioning

confidence: 99%

“…The measurement procedure presented is based on linear transfer functions (Sittig 1967;Sachse and Hsu 1979 JU1(t)eJwtd.t. (1) In practice, this Fourier transformation is performed using a }'ast Fourier Transform subroutine in a microcomputer.…”

Section: Measurement Theorymentioning

confidence: 99%

Characterization methods for ultrasonic test systems

Busse¹,

Becker²,

Bowey³

et al. 1982

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Methods for the characterization of ultrasonic transducers (search units) and instruments are presented.The instrument system is considered as three separate components consisting of a transducer, a receiver-display, and a pulser.The operation of each component is assessed independently.The methods presented were chosen because they provide the greatest amount of information about component operation and

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“…Other non-contact detectors exist, such as electromagnetic acoustic transducers (EMA Ts) [3], and capacitance devices [4]. Both of these methods require an electrically conductive sample, and a stand off distance of a few millimeters or less.…”

Section: Introductionmentioning

confidence: 99%