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liquid-surface acoustical holography

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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
... 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...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003240
EISBN: 978-1-62708-199-3
... 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. acoustical holography liquid-surface acoustical holography nondestructive...
Image
Published: 01 August 2018
Fig. 8 Schematic of the basic acoustical and optical systems used in nondestructive inspection by liquid-surface acoustical holography More
Image
Published: 01 August 2018
Fig. 9 Schematic of the acoustical portion of a liquid-surface acoustical holography system that is arranged to inspect strip products. The optical portion of this system is identical to that in Fig. 8 More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006457
EISBN: 978-1-62708-190-0
...-producing mechanisms Table 1 Generic flaw types and flaw-producing mechanisms Flaw-producing mechanism Generic flaw type Metal-to-metal Metal-to-core Core Surface Adhesive Disbonds, internal X … … … … Disbonds, part edge X X … … … Disbonds, high core X...
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
..., 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...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003239
EISBN: 978-1-62708-199-3
...). Another disadvantage of coatings is that they may change the thermal characteristics of the surface. Cholesteric Liquid Crystals Cholesteric liquid crystals are greaselike substances that can be blended to produce compounds having color transition ranges at temperatures from −20 to 250 °C (−5...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003228
EISBN: 978-1-62708-199-3
... Advantages Limitations Example of use Ultrasonics Changes in acoustic impedance caused by cracks, nonbonds, inclusions, or interfaces Can penetrate thick materials; excellent for crack detection; can be automated Normally requires coupling to material either by contact to surface or immersion...
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
..., radiography, X-ray computed tomography, thermography, low-frequency vibration methods, acoustic emission, eddy current testing, optical holography, and shearography. The article presents some examples are for fiber-reinforced polymer-matrix composites. Many of the techniques have general applicability...
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
... of the defect and surrounding good areas for easy comparison. Fig. 8 A-, B-, and C-scan ultrasonic images Air-Coupled Ultrasonics In many instances, it is beneficial to inspect some types of composite materials without contacting the surface with water or other coupling liquid used...
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
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006671
EISBN: 978-1-62708-213-6
... can be determined by measuring its rheology. Metal oxide and other ceramics or glasses form an electrical double (Stem) layer in water and other polar liquids. As the extent of the double layer increases, so does the repulsive force between similarly charged particles. As the concentration of surface...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
... , Kluwer , The Netherlands , 2000 10.1007/978-94-015-1303-6 3. Lieberman S. , Ed., Specialized NDT Methods II (Microwave, Optical Holography and Acoustic Holography), Lesson 14 , Fundamentals of Nondestructive Testing Self-Study Course , ASM International , 2011 4. Kharkovsky...
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
... surface. Each heated point inside the material is a center of expansion with which three orthogonal force dipoles can be associated ( Ref 4 , 5 ). When the surface is free and when light penetration is very small compared to the acoustic wavelength (which often is the case in metals), the dipole normal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
...: magnetic-particle inspection of ferrous metals, liquid-penetrant inspection, ultrasonic inspection, and sometimes eddy-current inspection. All these tests are used to detect surface cracks and discontinuities. Radiography is used mainly for internal examination. A photographic record of the results...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.9781627082136
EISBN: 978-1-62708-213-6
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006456
EISBN: 978-1-62708-190-0
... resonance imaging, and x-ray backscatter imaging. Acoustic emission, holography, and other techniques provide indirect or bulk information on the internal structure without specifically defining the structure. Comparison of ultrasound, radiography, and x-ray computed tomography Table 1 Comparison...