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couplants

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Image
Published: 01 August 2018
Fig. 7 Adaptive immersion imaging. (a) Image of couplant, I w ( r ), from which the surface profile, S c , is extracted. (b) Image of component interior, assuming planar surface. (c) Image of component interior, I c ( r ), taking account of refraction at measured S c . The dotted More
Image
Published: 01 August 2018
Fig. 17 Time-of-flight diffraction image influenced by variation of couplant layer thickness (which may be straightened by software) More
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003236
EISBN: 978-1-62708-199-3
... 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...
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...
Image
Published: 01 August 2018
couplant. Courtesy of L.D. Cox, General Dynamics Corp. More
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
... discontinuities, or to reveal indications even at the back side of the surface where access may be limited. There is an abundance of various UT approaches available to the failure analyst that can obtain volumetric information data. UT typically uses a water-, oil- or gel-based couplant to transfer the sound...
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
... or an array that emits a beam of ultrasonic waves when bursts of voltage are applied to it A couplant to transfer the input energy in the beam of ultrasonic waves from the transmitting transducer to the testpiece A couplant to transfer the output ultrasonic waves (acoustic energy) from the testpiece...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006469
EISBN: 978-1-62708-190-0
... a couplant to transmit energy from the transducer to the part and then from the part to the transducer in reception. The energy transfer is typically performed either in contact, where a thin layer of grease or gel is used between transducer and part, or in immersion, where the transducers and part...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006473
EISBN: 978-1-62708-190-0
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
..., liquid couplant must be applied to both sides of the assembly. Immersion Method 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: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006461
EISBN: 978-1-62708-190-0
... Ref Piezoelectric transducer applied directly Cylindrical symmetry Simple, straightforward technique Poor generation and reception efficiency for Rayleigh waves. Couplant required 2 , 10 Piezoelectric transducer plus wedge … Easy construction; efficient generation and detection...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004213
EISBN: 978-1-62708-184-9
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003657
EISBN: 978-1-62708-182-5
... to interpret, and it does not have liftoff effects. It has a wide range of material applicability: metals, composites, ceramics, and coatings. It is very easy to use as it does not require a couplant. Analytical and numerical models ( Ref 3 , 4 , 5 ) together with computing speed and storage...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006458
EISBN: 978-1-62708-190-0
... in many very fundamental and important ways. For example, as already mentioned, EMATs do not use a mechanical couplant between the active transducer face and the material under study, and EMATs can be used only with conducting or magnetostrictive materials. As described throughout this article...
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
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
..., the transducer is mounted in a water-filled cylinder that has a sliding seal in contact with the surface. The surface need not be perfectly smooth. The relatively minor loss of liquid couplant in scanning over a rough surface is replenished constantly by means of a water pump and reservoir. A technique...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006467
EISBN: 978-1-62708-190-0
... by a liquid couplant. The technique most commonly used in the nondestructive inspection of bars or barlike workpieces is the pulse-echo technique. Short pulses of ultrasonic energy are passed through the bar. The sweep voltage of the time base is coordinated with the pulse-repetition frequency so...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006452
EISBN: 978-1-62708-190-0
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006472
EISBN: 978-1-62708-190-0
... image that is missing scan lines caused by a too-high scanning speed Fig. 16 Time-of-flight diffraction scan showing time-based triggering problems Fig. 17 Time-of-flight diffraction image influenced by variation of couplant layer thickness (which may be straightened by software...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006336
EISBN: 978-1-62708-179-5
...) is typically controlled by the orientation of the transducer to the part surface. The transducer can be placed in direct contact with the part or, if the surface geometry is curved or rough, in noncontact using a liquid couplant. Transducers can be configured as either pulse-echo or pitch-catch. In pulse...