Author: Chad L. Butler
Publisher:
ISBN:
Category : Lasers
Languages : en
Pages : 100
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Book Description
Laser ultrasonics can be used to nondestructively evaluate structures to determine the existence and location of surface and interior flaws. The goal of this research was to determine if laser ultrasonic techniques can be applied to the inspection of aluminum plate. titanium tubes, and large welded plate structures. The research was carried out with a Q-switched pulsed ruby laser emitting light of 694 nm wavelength. Ultrasonic waves were experimentally generated and recorded in the aluminum plate and the titanium tube. A comprehensive literature study was completed to determine if the technique can be applied to welded structures. For the two experimental cases, the ultrasonic waves were received by a piezoelectric pinducer which was located on the opposite side of the plate. and on the outside of the tube. A digital oscilloscope captured the signals from the pinducer. The signals were then analyzed to determine echo spacing and frequency content. The physical characteristics of the laser pulse such as the energy and full-width-half-height and amplitudes were measured via a photodiode system and a calorimeter. The aluminum plate confirmed that the system was functioning properly, as the ultrasonic echoes that were generated matched the expected results from previous experimentation. The titanium tube data turned out to be difficult to interpret due to the complex geometry and mode conversion. The welding research showed that ultrasound can be used to identify many types of flaws in a welded joint. Currently, few researchers have applied the laser based ultrasound to flaw detection in finished welds, although several have looked at using the laser ultrasound as an input to a control system for a weld in progress. The literature research uncovered the need for further studies on the application of laser based ultrasound to flaw detection in completed welds.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 792
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 972
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Author:
Publisher:
ISBN:
Category : Industrialists
Languages : en
Pages : 2050
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Book Description
Vols. for 1970-71 includes manufacturers catalogs.
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : NASA tech briefs
Languages : en
Pages : 788
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 794
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Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1042
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Book Description
Author: J. David N. Cheeke
Publisher: CRC Press
ISBN: 1351833197
Category : Science
Languages : en
Pages : 507
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Book Description
Written at an intermediate level in a way that is easy to understand, Fundamentals and Applications of Ultrasonic Waves, Second Edition provides an up-to-date exposition of ultrasonics and some of its main applications. Designed specifically for newcomers to the field, this fully updated second edition emphasizes underlying physical concepts over mathematics. The first half covers the fundamentals of ultrasonic waves for isotropic media. Starting with bulk liquid and solid media, discussion extends to surface and plate effects, at which point the author introduces new modes such as Rayleigh and Lamb waves. This focus on only isotropic media simplifies the usually complex mathematics involved, enabling a clearer understanding of the underlying physics to avoid the complicated tensorial description characteristic of crystalline media. The second part of the book addresses a broad spectrum of industrial and research applications, including quartz crystal resonators, surface acoustic wave devices, MEMS and microacoustics, and acoustic sensors. It also provides a broad discussion on the use of ultrasonics for non-destructive evaluation. The author concentrates on the developing area of microacoustics, including exciting new work on the use of probe microscopy techniques in nanotechnology. Focusing on the physics of acoustic waves, as well as their propagation, technology, and applications, this book addresses viscoelasticity, as well as new concepts in acoustic microscopy. It updates coverage of ultrasonics in nature and developments in sonoluminescence, and it also compares new technologies, including use of atomic force acoustic microscopy and lasers. Highlighting both direct and indirect applications for readers working in neighboring disciplines, the author presents particularly important sections on the use of microacoustics and acoustic nanoprobes in next-generation devices and instruments.
Author:
Publisher:
ISBN:
Category : Nondestructive testing
Languages : en
Pages : 1016
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Author: United States. National Aeronautics and Space Administration. Technology Utilization Division
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 794
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