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pulse thermographic process

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Published: 01 January 2003
Fig. 2 The three phases characteristic of the pulse thermographic process and their respective characteristic time constant (a) deposition τ dep ; (b) contrast formation, τ nor ; (c) contrast dissipating, τ lat . The key parameters characterizing the specimen and defect are: thickness, t More
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
... Abstract This article begins with an overview of the various aspects of infrared pulse thermography used to detect disbondments, delaminations, and generalized corrosion. It describes the distinctive phases of the pulse thermographic process and the key components that are required to perform...
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
... surface. This article discusses the strategies for implementing thermography for NDE, including the steady-state/whole-body approach and transient heat conduction. It describes the most common signal-processing methods, such as thermographic signal reconstruction, lock-in thermography, and pulsed-phase...
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
... with the matched filter. Other techniques can help distinguish cracks by the characteristic increase in time lag with distance from the heat source. Pulse phase analysis ( Ref 13 , 14 ) and theory-based thermographic signal reconstruction ( Ref 15 ) analyze the time evolution of the heating process. Pulse phase...
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
... generation process, the absorbed laser energy is converted into heat in the top 10 to 100 μm (0.0004 to 0.004 in.) of the surface. The resulting temperature rise creates a local expansion of the material. If the heating laser pulse duration is short (10 to 100 ns), then the expansion will be in the frequency...
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
... challenges for defect detection and materials property characterization. Throughout their life cycle, composites are susceptible to the formation of many possible defects, primarily due to their multiple-step production process, nonhomogeneous nature, and brittle matrix. These defects include delaminations...
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: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0007023
EISBN: 978-1-62708-439-0
..., eddy current testing; PCRT, process-compensated resonance testing; RAM, resonance acoustic method; IET, impulse excitation technique; NLA, nonlinear acoustic; VT, visual testing; RT, radiographic testing; XCT, x-ray computed tomography; TT, thermographic testing; NI, neutron imaging; Sx, x-ray...
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
... and with similar manufacturing process parameters are deemed to be acceptable; or (3) sample NDE where random or worst-case/highest susceptibility components are targeted for inspection and serve as harbingers of the condition of similar untested components. Selection of NDE techniques are based not only...
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
... process. Resistance and hydrogen probes monitor on-line corrosion in reactor cooling waters, oil pipelines, and refineries ( Ref 1 , 2 ). The location and monitoring of these probes are critical for obtaining meaningful data. NACE Standard, RP0189-95 discusses such methods for on- line monitoring...
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.9781627084390
EISBN: 978-1-62708-439-0
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: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006409
EISBN: 978-1-62708-192-4
... heating can be defined as the transformation of frictional energy produced during a friction process. The temperature rise depends on intrinsic and extrinsic parameters such as material properties, tribological conditions, and ambient conditions. In dry sliding contact, so-called friction materials...