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laser ultrasound phased array transducers

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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
...), 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...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006460
EISBN: 978-1-62708-190-0
... of phase-array by numerical processing of an array of previously acquired laser-ultrasonic signals. The article describes the ultrasound generation by thermoelastic mechanism and ablation or vaporization. It illustrates the principle of optical detection of ultrasound with confocal Fabry-Perot...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006466
EISBN: 978-1-62708-190-0
... images of a sample throughout its entire thickness (reflection mode sometimes is employed). In operation, ultrasound is introduced to the bottom surface of the sample by a piezoelectric transducer, and the transmitted wave is detected on the top side by a rapidly scanning laser beam. The other two...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003436
EISBN: 978-1-62708-195-5
... of ultrasound (1 to 10 MHz). The important feature is that the ultrasound will propagate perpendicular to the surface, independent of the laser angle of incidence. This allows generation of ultrasound in complex-shaped parts at angles as high as ±45° off-axis, compared to conventional water- coupled transducers...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006478
EISBN: 978-1-62708-190-0
... is that the ultrasound will propagate perpendicular to the surface, independent of the laser angle of incidence. This allows generation of ultrasound in complex-shaped parts at angles as high as ±45° off-axis, compared to conventional water-coupled transducers that must remain within a few degrees of normal. Fig...
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
... with two transducers in transmission, with the object under test between them. An example of a two-transducer NDT system is shown in schematic form in Fig. 1 ( Ref 1 ). Recent years have seen increasing adoption of phased arrays; these are considered in the article “Phased Array Ultrasound...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.9781627081900
EISBN: 978-1-62708-190-0
Book Chapter

Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006474
EISBN: 978-1-62708-190-0
..., on a liquid surface. A pulsed laser captures the diffraction image of the liquid surface, giving an image of the part with a video rate frame of 50 to 60 per second. In Dassault’s system, specimens to be inspected were placed in front of a 10 cm (4 in.) diameter ultrasonic transducer, which can give discrete...
Series: 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 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...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006438
EISBN: 978-1-62708-190-0
... transducers, water or air immersion transducers, or laser velocimetry sensors. Guided wave ultrasound using piezoelectric, EMAT, or magnetostrictive sensors. This is a growing inspection approach because of advancement of techniques for focusing, steering, temperature, and dispersion curve compensation...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006449
EISBN: 978-1-62708-190-0
...., magnetic flux-leakage, Hall-effect sensors, and magnetic-particle techniques), ultrasonic, acoustic emission, guided wave, laser testing, microwave, radiographic, thermal and infrared testing, x-ray diffraction, and visual inspection. Selection of the NDT method depends on product manufacturing...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... (allowing field inspection) but also because it is versatile and applicable to a wide range of situations. Although single-element transducers have been used for several decades, such inspections are increasingly commonly performed with equipment that uses a phased array. The ultrasonic NDT landscape also...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... of cracks that may be more perpendicular to the part surface than parallel to the surface. The angle can be changed by coupling the transducer to various angle wedges in order to obtain the optimal UT signal path. The beam angle can also be changed with modern Phased Array Ultrasound Testers (PAUT) that can...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003045
EISBN: 978-1-62708-200-6
... the transducer over the surface of the material Receiving the ultrasound after it has interacted with the material Analyzing the ultrasonic waveform Displaying the analyzed data Figure 1 shows the components that perform these functions. In the example system shown, ultrasonic signals originate...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003057
EISBN: 978-1-62708-200-6
... relationships with other phases. Because all periodic structures can diffract, arrays of dislocations, phase boundaries, and precipitates on a small scale can be detected by electron diffraction analysis ( Ref 21 , 23 , 24 , 25 ). Spectroscopic Methods Atoms in molecules or crystals vibrate...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.9781627082907
EISBN: 978-1-62708-290-7
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005553
EISBN: 978-1-62708-174-0
... and receiving the ultrasound with noncontact sensors. A noncontact system was developed that combined a laser array generation source and an electromagnetic acoustic transducer receiver ( Ref 104 , Ref 105 ). Similar to other external sensing methods, movement of the sensor must be synchronized with the torch...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.9781627082006
EISBN: 978-1-62708-200-6