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terahertz imaging

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Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
... for microwaves. It discusses the advantages and limitations of inspection with microwaves. The article discusses the physical principles, including reflection and refraction, absorption and dispersion, scattering, and standing waves. It provides a discussion on terahertz (THz) imaging for nondestructive...
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
... geometry such as a welded assembly, or is additively manufactured, or if the part has both metallic and nonmetallic or composite sections. There are terahertz (THz) imaging, infrared (IR) imaging and laser shearography (ST) techniques available that use discontinuity location and damage mode where other...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006936
EISBN: 978-1-62708-395-9
... the linear and phased array systems that are sometimes used for large-scale inspection tasks to reduce scan times, the various gating and image processing techniques, and how ultrasonic data are interpreted and presented. A brief section on future trends in ultrasonic inspection is presented at the end...
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
... of the test component. Typical inspection techniques examine some metric or signal against a threshold level. The signal may be a simple voltage or indicator level or it may be a complex multidimensional image; however, the basic concept of flaw detection is that the signal exceeds a detection threshold...
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006953
EISBN: 978-1-62708-439-0
... provides the advantage of displaying the images of the vibrational modes of the parts at their resonant frequencies. This opportunity is useful for confirming mode shape changes, particularly for modes that are closely spaced in frequency. Examples of Resonant Ultrasound Spectroscopy Impulse Excitation...
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
... 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 discontinuities that alter heat transfer through object Requires precise control of environment, heat...
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