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radiation emission

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Image
Published: 01 August 2018
Fig. 3 Angular dependence of acoustic emission radiated by formation of a tensile microcrack in the plane parallel to the y -axis. Continuous line: P-wave; dotted line: S-wave More
Image
Published: 30 September 2014
Fig. 8 Spectral blackbody emissive power for (a) wavelengths in the thermal radiation spectrum (10 −1 to 100 μm) and (b) wavelengths in the near-infrared radiation spectrum (0.75 to 3.0 μm). Dominant wavelengths are shown for temperatures typically encountered in the heat treating of metals. More
Image
Published: 09 June 2014
Fig. 13 Radiation loss density as a function of temperature and emissivity. Source: Ref 14 More
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001733
EISBN: 978-1-62708-178-8
... Abstract This article provides an introduction to x-ray spectrometry, and discusses the role of electromagnetic radiation, x-ray emission, and x-ray absorption. It focuses on the instrumentation of wavelength-dispersive x-ray spectrometers, and energy dispersive x-ray spectrometers (EDS...
Book Chapter

By S. Lampman
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006645
EISBN: 978-1-62708-213-6
...-dispersive spectrometer (WDS) and energy-dispersive spectrometer (EDS). This is followed by a discussion on the mechanism and effects of X-ray radiation, X-ray emission, and X-ray absorption. The article then discusses components used, operation, and applications of WDS and EDS. Some of the factors...
Image
Published: 09 June 2014
Fig. 4 Dependence of the monochromatic radiative (emissive) flux (power) surface density on the wavelength of radiation for black and gray bodies (a), and dependence of radiation intensity on wavelength of radiation for a black body at different temperatures (b); Wien's displacement law More
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006954
EISBN: 978-1-62708-439-0
... as a thermal camera if its function enables some quantification of radiating thermal emission from an object that is then related to the object surface temperature. Because temperatures near the processing zone of metal AM are exceedingly high (more than 1000 °C, or 1830 °F), much of the thermal radiant...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0005692
EISBN: 978-1-62708-178-8
..., interpre- quantity. analytical gap. The region between two tation, and application of spectra originat- electrodes in which the sample is excited ing in the absorption of electromagnetic amorphous solid. A rigid material whose in the sources used for emission spectros- radiation by atoms, ions, radicals...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006748
EISBN: 978-1-62708-213-6
.... Infrared radiation in emission (of electromagnetic radiation). The the wavelength range of 30 to 300 mm creation of radiant energy in matter, result- escape peak. An artifact observed in x-ray (3 Â 105 to 3 Â 106 A ). ing in a corresponding decrease in the analysis; manifested as a peak at energy energy...
Image
Published: 01 November 2010
Fig. 21 Variation of the thermal radiation-loss density vs. temperature and emissivity (ε). Source: Ref 1 More
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005925
EISBN: 978-1-62708-166-5
..., such as cost, temperature range, useful life, accuracy, size, and response speed. The selection of noncontact sensors involves similar considerations plus those related to radiation factors such as target size, surface emissivity, focal length, and sighting path interference. Thermocouples and resistance...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005993
EISBN: 978-1-62708-166-5
... surface, do not radiate as much energy as the black body. To describe the gray nature of such a surface, the term emissivity is introduced. Emissivity is the ratio of radiation of the gray surface to an ideal black surface. The importance of radiation becomes intensified at high temperature levels...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001398
EISBN: 978-1-62708-173-3
..., in fact) is in part absorbed by the target, in part reflected by the target, and the balance causes an instantaneous emission of highly energized atomic and subatomic particles from the target's uppermost surface layer. The ratio of these three parts is a function of laser wavelength and of surface...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005449
EISBN: 978-1-62708-196-2
..., such as a glossy painted surface, do not radiate as much energy as the black body. To describe the gray nature of such a surface, the term emissivity is introduced. Emissivity is the ratio of radiation of the gray surface to an ideal black surface. The importance of radiation becomes intensified at high...
Image
Published: 15 December 2019
Fig. 4 Schematic representation of the plasma flame structure showing the various analytical areas. The atomization process mainly occurs in the preheating zone. The initial radiation zone covers predominantly the excitation and ionization, and the normal analytical zone comprises the emission More
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005638
EISBN: 978-1-62708-174-0
... as a diagnostic technique for weld quality monitoring ( Ref 15 , 16 ). An area that has received greater investigation is the spectral range of the electromagnetic radiation emission from the metal vapor/plasma plume. Monitoring this spectral range provides means to infer the quality of the laser weld process...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001732
EISBN: 978-1-62708-178-8
... the sample. Therefore, I 0 is no longer essentially constant throughout the sample, and emission may appear to decrease as concentration increases at these levels. Self-absorption, in which the emitting species subsequently reabsorbs emitted radiation, may also occur at high concentrations...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001749
EISBN: 978-1-62708-178-8
... preparation, equipment and process safety, and the handling of radioactive gasses and materials. The article concludes with application examples involving the analysis of rare-earth elements and nuclear fuels. positron emission quantitative determination radiation properties radioactivation analysis...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005878
EISBN: 978-1-62708-167-2
... ) where σ 0 = 5.67·10 –8 W/(m 2 ·K 4 ), denotes the Stefan-Boltzmann constant ε - the total emissivity α r - the radiation heat transfer coefficient T Ar - the ambient temperature of radiation environment Where the radiation heat transfer coefficient (α r ) is given...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005731
EISBN: 978-1-62708-171-9
... methods: H.H. Willard's Instrumental Methods of Analysis ( Ref 3 ). In addition to wet chemical methods, adsorption and emission spectroscopy are used to determine the chemistry of thermal spray feedstock materials. Spectroscopy is the measurement and interpretation of electromagnetic radiation absorbed...