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Search Results for ultrasonic transducers
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Wedge-based ultrasonic transducers. (a) Illustration of wave mode conversio...
Available to PurchasePublished: 01 August 2018
Fig. 9 Wedge-based ultrasonic transducers. (a) Illustration of wave mode conversion to generate shear waves. (b) Examples of angle beam transducers. Courtesy of Iowa State University Center for Nondestructive Evaluation
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Image
Oscilloscope displays using ultrasonic transducers of (a) high and low pene...
Available to PurchasePublished: 01 December 1998
Fig. 3 Oscilloscope displays using ultrasonic transducers of (a) high and low penetration (ability to detect defects at distances within the solid), and (b) high and low resolution (ability to separate echoes from closely-spaced defects)
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Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006471
EISBN: 978-1-62708-190-0
... Abstract This article discusses the advantages, disadvantages, applications, and selection criteria of various technologies and transduction modalities that can generate and detect ultrasonic waves. These include piezoelectric transducers, electromagnetic acoustic transducers (EMATs), laser...
Abstract
This article discusses the advantages, disadvantages, applications, and selection criteria of various technologies and transduction modalities that can generate and detect ultrasonic waves. These include piezoelectric transducers, electromagnetic acoustic transducers (EMATs), laser ultrasound phased array transducers, magnetostriction transducers, and couplants. The article discusses four basic types of search units with piezoelectric transducers. These include the straight-beam contact type, the angle-beam contact type, the dual-element contact type, and the immersion type. The article concludes with information on immersion or contact type focused search units.
Image
(a) The principle of laser-ultrasonics or of a “laser-ultrasonic transducer...
Available to Purchase
in Laser-Ultrasonics—Principles and Industrial Applications
> Nondestructive Evaluation of Materials
Published: 01 August 2018
Fig. 1 (a) The principle of laser-ultrasonics or of a “laser-ultrasonic transducer” compared to (b) conventional piezoelectric-based ultrasonics
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Book Chapter
Ultrasonic Inspection
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003236
EISBN: 978-1-62708-199-3
... account of ultrasonic flaw detectors, including ultrasonic transducers and types of search units and couplants. The article describes pulse-echo and transmission inspection methods and data interpretation. The general characteristics of ultrasonic waves and the factors influencing ultrasonic inspection...
Abstract
Ultrasonic inspection is a nondestructive method in which beams of high-frequency acoustic energy are introduced into a material to detect surface and subsurface flaws, to measure the thickness of the material, and to measure the distance to a flaw. This article provides a detailed account of ultrasonic flaw detectors, including ultrasonic transducers and types of search units and couplants. The article describes pulse-echo and transmission inspection methods and data interpretation. The general characteristics of ultrasonic waves and the factors influencing ultrasonic inspection are also addressed. The article concludes with a review of the advantages and disadvantages of ultrasonic inspection compared with other methods applications of the technique.
Image
Typical ultrasonic quenching system with 20 kHz transducers arranged at the...
Available to PurchasePublished: 01 February 2024
Fig. 65 Typical ultrasonic quenching system with 20 kHz transducers arranged at the periphery of the cylindrical quenching tank. The transducers are welded at a stress antinode.
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Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001226
EISBN: 978-1-62708-170-2
... in ultrasonic cleaning. The components used in the generation of ultrasonic wave include piezoelectric and magnetostrictive transducers that are used in ultrasonic generators and tanks. The effects of solution type and its temperature on the effectiveness of ultrasonic cleaning are also discussed...
Abstract
Ultrasonic cleaning involves the use of high-frequency sound waves that is above the upper range of human heating, or about 18 kHz, to remove a variety of contaminants from parts immersed in aqueous media. This article describes the process, design considerations and the equipment in ultrasonic cleaning. The components used in the generation of ultrasonic wave include piezoelectric and magnetostrictive transducers that are used in ultrasonic generators and tanks. The effects of solution type and its temperature on the effectiveness of ultrasonic cleaning are also discussed.
Image
Planet gear carrier assembly (a) showing the four welds in one stack that c...
Available to PurchasePublished: 01 January 1993
Fig. 9 Planet gear carrier assembly (a) showing the four welds in one stack that connect the three decks. The top and top-center welds are tested by the top ultrasonic transducer, and the bottom and bottom-center welds are inspected by the bottom transducer. (b) Close-up of upper transducer
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Image
Illustration of differences in response between (a) an unfocused and (b) a ...
Available to PurchasePublished: 01 August 2018
Fig. 18 Illustration of differences in response between (a) an unfocused and (b) a focused ultrasonic transducer. Adapted from Ref 27
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Image
Ultrasonic crack measurement system for double-beam specimens. Bolt-loaded ...
Available to PurchasePublished: 01 January 2003
Fig. 31 Ultrasonic crack measurement system for double-beam specimens. Bolt-loaded specimen is mounted on translation stage at center. Ultrasonic transducer is located above specimen, and the oscilloscope at left indicates (left to right) the top of the specimen, the crack plane
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Image
Smart pipeline inspection gage devices enable internal inspection of in-ser...
Available to PurchasePublished: 01 August 2018
Fig. 19 Smart pipeline inspection gage devices enable internal inspection of in-service line pipe. Such devices can be equipped with odometers, calipers, tilt sensors, magnetic sensors, and ultrasonic transducers to capture information about the condition of the pipe without removing it from
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Book Chapter
Acoustical Holography
Available to PurchaseSeries: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006474
EISBN: 978-1-62708-190-0
... ultrasonic transducer (in some cases more than 20 cm, or 8 in., in diameter) to generate plane waves, which provide the ultrasonic illumination, and then uses liquid-surface holography, through the interaction with a beam from a reference transducer, to convert the sonic image into a wave pattern...
Abstract
Acoustical holography is the extension of holography into the ultrasonic domain. The basic systems for acoustical holography are the liquid-surface type and the scanning type. This article discusses the applications for acoustical holography, including inspection of large composite parts, through-transmission breast imaging system, inspection of welds in thick materials, and inspection of sleeve-bearing stock. It describes the basic system for liquid-surface acoustical holography and scanning acoustical holography. A comparison between these techniques is also provided.
Book Chapter
Rayleigh Wave Nondestructive Evaluation for Defect Detection and Materials Characterization
Available to PurchaseSeries: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006461
EISBN: 978-1-62708-190-0
... Abstract This article provides an overview of the characteristics of Rayleigh waves plus methods for generation and detection of waves, including using piezoelectric transducers or noncontact techniques such as lasers, electromagnetic acoustic transducers, or air-coupled ultrasonics. It reviews...
Abstract
This article provides an overview of the characteristics of Rayleigh waves plus methods for generation and detection of waves, including using piezoelectric transducers or noncontact techniques such as lasers, electromagnetic acoustic transducers, or air-coupled ultrasonics. It reviews the methods for using Rayleigh waves for defect detection and materials characterization, alongside nonlinear ultrasonic inspection and surface acoustic wave (SAW) microscopy. The article concludes with information on the standards that use Rayleigh waves for nondestructive evaluation (NDE) of different structures.
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006470
EISBN: 978-1-62708-190-0
... Abstract Ultrasonic inspection is a family of nondestructive methods in which beams of high-frequency mechanical waves are introduced into materials, using transducers, for the detection and characterization of both surface and subsurface anomalies and flaws in the material. This article...
Abstract
Ultrasonic inspection is a family of nondestructive methods in which beams of high-frequency mechanical waves are introduced into materials, using transducers, for the detection and characterization of both surface and subsurface anomalies and flaws in the material. This article describes the basic equipment in ultrasonic inspection systems, and lists the advantages and disadvantages of these systems. It discusses the applications of ultrasonic inspection and also the general characteristics of ultrasonic waves in terms of wave propagation, longitudinal waves, transverse waves, surface waves, and lamb waves. The article reviews the major variables in ultrasonic inspection, including frequency, acoustic impedance, angle of incidence, and beam intensity. It discusses the attenuation of ultrasonic beams and provides information on the pulse-echo and transmission methods for implementing ultrasonic inspection.
Book Chapter
Holography
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003240
EISBN: 978-1-62708-199-3
..., except for the method of read out. In liquid-surface systems, two separate ultrasonic transducers supply the object beam and reference beam, which are usually pulsed. The two transducers and the test object are immersed in a water-filled tank. The test object is positioned in the object plane...
Abstract
Holography is basically a two-step process for creating a whole three dimensional image of a diffusely reflecting object having some arbitrary shape. This article discusses the advantages, disadvantages and applications of using the optical holography method in nondestructive evaluation. It also discusses the types of acoustical holography, including liquid-surface acoustical holography and scanning acoustical holography. The article concludes by comparing liquid-surface and scanning systems.
Book Chapter
Electromagnetic Acoustic Transducers for Nondestructive Evaluation
Available to PurchaseSeries: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006458
EISBN: 978-1-62708-190-0
... Abstract This article describes the basic features of electromagnetic acoustic transducers (EMATs) and discusses their existing and some potential uses within the field of ultrasonic nondestructive evaluation (UNDE). It provides sufficient basic and practical information to make an informed...
Abstract
This article describes the basic features of electromagnetic acoustic transducers (EMATs) and discusses their existing and some potential uses within the field of ultrasonic nondestructive evaluation (UNDE). It provides sufficient basic and practical information to make an informed choice when considering the transducer to be used for any particular UNDE application. The article describes how different types of EMATs operate and presents their fundamental and some practical limitations. It summarizes the representative literature for electromagnetic acoustic transducer UNDE applications. Some successful uses of EMATs are mentioned to illustrate the depth, range, and potential of commercial EMAT applications. The article concludes with information on the commercial sources for EMAT systems and components.
Image
Principles of ultrasonic pulse-echo testing. (a) Transducer on a plate. (b)...
Available to Purchase
in Basic Inspection Methods (Pulse-Echo and Transmission Methods)[1]
> Nondestructive Evaluation of Materials
Published: 01 August 2018
Fig. 1 Principles of ultrasonic pulse-echo testing. (a) Transducer on a plate. (b) Transducer on a plate with a small defect. (c) Transducer on a plate containing a large defect. Adapted from Ref 2
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Image
Published: 01 August 2018
Image
Examples of portable ultrasonic units (a) with transducer for pulse-echo me...
Available to PurchasePublished: 01 August 2018
Fig. 2 Examples of portable ultrasonic units (a) with transducer for pulse-echo measurement and (b) with phased array. Reprinted with permission from Olympus Corporation. (c) system for testing round bars: ROWA B-130 (left), ROWA B-260 (right). Courtesy of Timken
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Image
Circumferential ultrasonic C-scan using 5 MHz transducer from the circumfer...
Available to Purchase
in Nondestructive Testing of Composites (Polymer- and Metal-Matrix Composites)[1]
> Nondestructive Evaluation of Materials
Published: 01 August 2018
Fig. 44 Circumferential ultrasonic C-scan using 5 MHz transducer from the circumference of a 6090/SiC/25p billet
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