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high-frequency sound waves

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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
... controls all functions, including the hoist, and allows for storage of different process parameters for different types of parts. Courtesy of Blue Wave Ultrasonics Abstract Abstract Ultrasonic cleaning involves the use of high-frequency sound waves that is above the upper range of human heating...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0009152
EISBN: 978-1-62708-186-3
... Ultrasonic sensors operate by emitting and receiving high-frequency sound waves. The frequency is usually on the order of 200 kHz, which is beyond the audible range of the human ear. When an object to be detected comes into the path of the ultrasonic signal, the pulses are either reflected or echoed back...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006477
EISBN: 978-1-62708-190-0
... is the requirement for accessibility to both surfaces of the material to be tested. The ultrasonic method uses high-frequency sound waves to locate and measure flaws in welds. It can be used to inspect various materials such as metals, plastics, composites, ceramics, and others. This is an extremely sensitive...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005616
EISBN: 978-1-62708-174-0
... methods is the requirement for accessibility to both surfaces of the material to be tested. The ultrasonic method uses high-frequency sound waves to locate and measure flaws in welds. It can be used to inspect various materials such as metals, plastics, composites, ceramics, and others...
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
... be detected. It is worth noting coarse-grained metals can absorb high-frequency sound waves, making UT inspection problematic. The reason advanced RT methods such as computed tomography (CT) are so helpful for failure analysis is because of their ability to account for not just crack orientation issues...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003045
EISBN: 978-1-62708-200-6
... is typically coupled to the material by water or oil because of the efficiency in transmitting high-frequency sound waves and because air is unable to support sound waves in the ultrasonic-frequency regime. The ultrasonic wave travels through the material under inspection and interacts with its microstructure...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005935
EISBN: 978-1-62708-166-5
... signals Setup for monitoring temperatures at the surface and in the core during quenching, and monitoring of the medium temperature The measuring setup for detecting and processing sound signals includes: Hydrophone with high sensibility in the frequency ranges from 0.1 Hz to 180 kHz...
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
... transmission method ultrasonic flaw detectors ultrasonic inspection ultrasonic waves 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...
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
... on the properties of the test specimen, particularly its sound attenuation. Ultrasonics of high frequency produce good resolution, which is the ability to separate echoes from closely spaced defects. Ultrasonics of low frequency penetrate deeper into materials because attenuation is generally lower. However...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005340
EISBN: 978-1-62708-187-0
... The ultrasonic technique, developed for online assessment of the cleanliness of molten aluminum alloys, relies on guide steel rods to introduce high-frequency sound waves into the melt and to receive the reflected signals ( Ref 9 ). The study ( Ref 9 ) reveals that the ultrasonic sensor allows online evaluation...
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
... attention to this region of the pipe. For high-frequency induction- and electric-resistance-welded pipe, flaws may be located in the weld plane with two-dimensional features (i.e., length and width but negligible thickness). By comparison, porosity is of greater concern for traditional fusion welds...
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
... focuses the image of the test object at the liquid surface. This image contains a wave front nearly identical to that emanating from the test object. (A small disk of a material having very high acoustic impedance can be placed at the focal point of the acoustic lens to prevent any unmodified portion...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003315
EISBN: 978-1-62708-176-4
... amplifying horns, and the test specimen. A typical wave train is shown in Fig. 6 . The acoustic energy is supplied by a high-frequency power supply. An amplitude-measuring device and a means of dissipating the heat generated by the deformation process are also necessary. This basic equipment is appropriate...
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: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006469
EISBN: 978-1-62708-190-0
... reverses direction and is reflected back to the transducer. For the high-speed testing of a plate, strip, or wire in which the thickness is on the order of a few wavelengths, it may be beneficial to use Lamb waves ( Ref 11 ). Lamb waves (or plate waves) are elastic waves that propagate in plates...
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
... Thermography Delaminations, fiber concentrations, bonding defects, inclusions Good provided suitable heat source and images obtained over suitable time range Moderate for delaminations and inclusions; not applicable to other defects Good Fair High Low-frequency methods Incorrect fiber volume fraction...
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
... separation Detail sensitivity  Resolution Large structures: typically 0.5 mm (0.02 in.) features are resolved, smaller high-contrast features can be detectedSmall structures: (<250 mm, or 10 in.) typically resolves 1 to 2 parts in 500  Density measurement Multiple materials must differ in x-ray...
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
... for the complete automation of pass/fail decisions to be made in a high-production environment with improved reproducibility and objectivity. Ultrasonic inspection is a nondestructive method in which pulses of high-frequency acoustic waves are introduced into materials. The velocity, reflection...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006445
EISBN: 978-1-62708-190-0
..., shearing of the compact in planes parallel to the punch axis can only be avoided by proper sequencing of punch motions. Nevertheless, significant density variations can occur at the transition from one part level to another as illustrated in Fig. 1 . Sound waves of high frequency and short wavelength...
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
.... The scanning acoustic microscope uses this Rayleigh wave mode and is designed for very high-resolution images of the surface and near-surface regions of a sample. Penetration depth is intrinsically limited, however, to only one wavelength of sound because of the geometry of the lens. For example, at 1 GHz...