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surface-excited thermography

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Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006464
EISBN: 978-1-62708-190-0
...Abstract Abstract For most nondestructive evaluation (NDE) applications, the term thermography actually refers to surface-excited thermography (SET) that involves thermal mapping of surface temperature as heat flows from, to, or through a test object in response to excitation applied...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006453
EISBN: 978-1-62708-190-0
... configuration and selective excitation configuration of the signal-generation mechanisms in thermal nondestructive evaluation methods. The three widely used approaches to TNDE are surface-excited thermography, vibrothermography, and thermoelastic stress analysis. The article provides information on the common...
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 perform active thermography. The components include an excitation source, a thermographic camera, and a computer with software that controls the instrumentation, acquires data, and displays the results. The article discusses the process and experimental setup of sonic thermography used for crack detection...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006444
EISBN: 978-1-62708-190-0
... heating ( Ref 1 ). In the vibrothermography process, a specimen is vibrated at high amplitude with a transducer or exciter, making contacting surfaces, such as crack and delamination faces, clap and rub. Clapping and rubbing generates heat, which conducts to the specimen surface and is imaged using...
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
... inspection and many types of temperature-measuring devices and substances, this article focuses only on thermography, which is the mapping of isotherms, or contours of equal temperature, over a test surface, and on thermometry, which is the measurement of temperature. Thermography techniques can...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003653
EISBN: 978-1-62708-182-5
... or infrared light, and some unique methods utilizing reflected and amplified light to look at surface topography, triboluminescent sensing, thermography, and the superconducting quantum interference device (SQUID). Reports describing these methods are included in NACE Symposia on corrosion monitoring...
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
... thermography using a tuned speaker can also be used to mechanically excite the surface of a part when heating is not practical. Similarly, vibro-thermography can be used to mechanically excite a component with high-frequency vibrations in order to detect small tight surface cracks relative to the detection...
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
... to the bare epoxy signal for both laser wavelengths (i.e., the CO 2 and 3.3 μm data cannot be directly compared). This shows there is considerable variance in signal strength for different surface conditions. BMI, bismaleimide The short-pulse transversely excited atmosphere (TEA) carbon dioxide laser...
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: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003436
EISBN: 978-1-62708-195-5
...-ultrasonics, 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...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006438
EISBN: 978-1-62708-190-0
..., flash thermography, and laser flying spot/line technology Surface temperatures are imaged by point sensors, IR cameras, or coatings that change appearance with temperature. Analysis is based on absolute and change of temperature following a stimulus. Locating near-surface defects that alter heat...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006451
EISBN: 978-1-62708-190-0
... stress on the surface of a part subjected to time-varying loads. Thermoelastic stress analysis differs from other thermal techniques in that it does not measure heat transfer through a part due to an externally applied excitation, as in pulse thermography or vibrothermography, but instead it measures...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006557
EISBN: 978-1-62708-290-7
...-deposition-processed Ti-6Al-4V component Fig. 10 Schematic of pore structure in a metal compact and pore-removal steps. (1) Pore formation during debinding. (2) Binder diffusion into inner pore/binder interface followed by (3) binder evaporation and (4) gaseous escape to the surface. (5) Nitrogen...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004215
EISBN: 978-1-62708-184-9
..., size, position, and orientation. The person setting the inspection strategy should review the likely effectiveness of the inspection proposed for each site, particularly where there is complex weld geometry, poor surface finish, or restricted access. Advances in NDE techniques have made it possible...
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
... to glean the necessary information for the tube or pipe being inspected. Frequency selection is easily achieved at the current source attached to the exciter coil. Because a high frequency concentrates the current at the surface of the inspected tube or pipe, there is greater sensitivity...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001482
EISBN: 978-1-62708-173-3
..., and residual strain history observed in the heat-affected zone of fusion welded materials. fluid-flow calculation free surface deformation fusion welded materials fusion welding heat affect zone liquid-vapor state solid-liquid state solid-solid state validation vapor-plasma state FUSION...
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
... for clean (tumbled) surfaces Thermography Thermal conductivity/infrared camera Image analysis/image comparison Surfaces Varies Possibly surface Surface flaws only X-ray Absorption of x-rays/camera Image analysis/image comparison Volume Mostly not possible If inclusion changes total...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005553
EISBN: 978-1-62708-174-0
... are a function of the external force, the properties of the molten region, the surface tension, and the shape of the container. Determining the depth of penetration using the natural resonant frequency of the pool vibrations involves exciting the pool into motion, sensing the weld pool oscillations, and modeling...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... for dimensional anomalies, color variation, cracks, pits, etc. Only sensitive to surface flaws Low cost, intuitive. May be enhanced with PT, MT, IR, UV, laser reference lines, video, and magnifying lenses All Thermal/infrared (IR)—includes passive thermal inspections, flash thermography, and laser flying...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006402
EISBN: 978-1-62708-192-4
... the results of tribological tests, where the system-dependent characteristics of friction and wear data can be expressed in different forms, such as tribographs, transition diagrams, and tribomaps. A summary of various methods of surface analysis is presented in a table. The article discusses the relationship...