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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...
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
... beneficial to inspect some types of composite materials without contacting the surface with water or other coupling liquid used in the standard ultrasonic inspection system approach. One method to accomplish this is with air-coupled ultrasonic testing (UT). The technique can be used very effectively on...
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
.... For example, thermally induced strain in holography or the technique of thermal excitation with ultrasonic or acoustic methods does not constitute thermal inspection. Cholesteric liquid crystals are greaselike substances that can be blended to produce compounds having color transition ranges at...
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
... example, ultrasonic waves are almost completely reflected at metal-gas interfaces. Partial reflection occurs at a metal-liquid interface or at an interface between a metal and another solid, with the specific percentage of reflected energy depending mainly on the ratios of certain acoustic properties...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003228
EISBN: 978-1-62708-199-3
...; moderate cost Limited to electrically conducting materials; limited penetration depth Heat exchanger tubes for wall thinning and cracks Liquid penetrant Surface openings due to cracks, porosity, seams, or folds Inexpensive, easy to use, readily portable, sensitive to small surface flaws Flaw must...
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
... perform the test, liquid couplant must be applied to both sides of the assembly. For this method, the assembly must be immersed in a tank of water, or water squirters must be used to act as a couplant for the ultrasonic beam. There are three fundamental techniques: pulse echo ( Fig. 20c ), through...
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
... 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 potential determining is changed (pH), the layer thickness changes. When...
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
...-delay interferometry), which should be on the order of half the ultrasonic period for optimal sensitivity. For the frequency range of 1 to 20 MHz, this results in a very bulky system, particularly if immersion in a liquid bath is added to increase etendue. A much more practical implementation of time...
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
... to be in a liquid or gelatinous state, because the time constants for solids are too short. In addition, the object cannot contain ferromagnetic materials, which would disrupt the uniform magnetic field, nor can it contain highly conductive materials that would interfere with the transmission of the...