Measurement of scattering laser energy density distribution in optical extinctive chambers based on CCD imaging method

This study designs and develops a set of far-field laser spot energy testing system based on energy density detecting array. Through installing energy density detectors on the characteristic location of energy density target, the practical value of laser’s energy could be adopted. Meanwhile, by the use of visible light image equipment, the energy density distribution image of laser spot with a wavelength of 532nm on target surface could be obtained. After that, the energy density of each spot on the target surface as well as the energy density distribution have been figured out by fusing the grey level of laser spot image with the practical energy value detected by laser energy probes. The result shows that this system, which is simple, reliable, and available for the far-field laser energy density measurement under all circumstances, is capable of precisely measuring the far-field laser energy distribution with more than 1km with few measurement errors.

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Optics and photonics - Lasers and laser-related equipment - Test methods for laser beam power (energy) density distribution

10.3403/30354210 ◽

2018 ◽

Keyword(s):

Energy Density ◽

Laser Beam ◽

Density Distribution ◽

Test Methods ◽

Beam Power ◽

Energy Density Distribution ◽

Laser Beam Power

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Effect of laser energy density on the evolution of Ni4Ti3 precipitate and property of NiTi shape memory alloys prepared by selective laser melting

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.159338 ◽

2021 ◽

Vol 869 ◽

pp. 159338

Author(s):

Jie Gan ◽

Longchen Duan ◽

Fei Li ◽

Yusi Che ◽

Yan Zhou ◽

...

Keyword(s):

Energy Density ◽

Shape Memory Alloys ◽

Shape Memory ◽

Selective Laser Melting ◽

Laser Energy ◽

Laser Energy Density ◽

Laser Melting ◽

Niti Shape Memory Alloys

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Effect of Laser Energy Density on Surface Morphology, Microstructure, and Magnetic Properties of Selective Laser Melted Fe-3wt.% Si Alloys

Journal of Materials Engineering and Performance ◽

10.1007/s11665-021-05591-w ◽

2021 ◽

Author(s):

Shuohong Gao ◽

Xingchen Yan ◽

Cheng Chang ◽

Eric Aubry ◽

Min Liu ◽

...

Keyword(s):

Magnetic Properties ◽

Energy Density ◽

Surface Morphology ◽

Laser Energy ◽

Laser Energy Density ◽

Microstructure And Magnetic Properties

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Measurement facility for the relative radiation energy density distribution for pulse-periodic lasers

Measurement Techniques ◽

10.1007/bf00864876 ◽

1988 ◽

Vol 31 (10) ◽

pp. 966-967

Author(s):

V. I. Andreev ◽

A. P. Palivoda ◽

S. P. Fetisov ◽

N. V. Shalomeeva ◽

V. A. Yakovlev

Keyword(s):

Energy Density ◽

Density Distribution ◽

Radiation Energy ◽

Measurement Facility ◽

Radiation Energy Density ◽

Energy Density Distribution

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Nanocomposite Thick-Film Magnets with ${{\hbox{Nd}}\hbox{-}{\hbox{Fe}}\hbox{-}{\hbox{B}}+\alpha\hbox{-}{\hbox{Fe}}}$ Phases Prepared under High Laser Energy Density

IEEE Transactions on Magnetics ◽

10.1109/tmag.2013.2276419 ◽

2014 ◽

Vol 50 (1) ◽

pp. 1-4 ◽

Cited By ~ 5

Author(s):

M. Nakano ◽

K. Motomura ◽

T. Yanai ◽

H. Fukunaga

Keyword(s):

Energy Density ◽

Thick Film ◽

Laser Energy ◽

Laser Energy Density ◽

High Laser ◽

High Laser Energy

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Effect of High Laser Energy Density on Selective Laser Melted 316L Stainless Steel: Analysis on Metallurgical and Mechanical Properties and Comparison with Wrought 316L Stainless Steel

3D Printing and Additive Manufacturing ◽

10.1089/3dp.2021.0061 ◽

2021 ◽

Author(s):

Pradeep Kumar Shanmuganathan ◽

Dinesh Babu Purushothaman ◽

Marimuthu Ponnusamy

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Energy Density ◽

316L Stainless Steel ◽

Laser Energy ◽

Laser Energy Density ◽

High Laser ◽

Steel Analysis ◽

High Laser Energy

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Fundamentals of radiation heat transfer in AlSi10Mg powder bed during selective laser melting

Rapid Prototyping Journal ◽

10.1108/rpj-11-2016-0189 ◽

2019 ◽

Vol 25 (9) ◽

pp. 1506-1515 ◽

Cited By ~ 1

Author(s):

Pei Wei ◽

Zhengying Wei ◽

Zhne Chen ◽

Jun Du ◽

Yuyang He ◽

...

Keyword(s):

Heat Transfer ◽

Energy Density ◽

Negative Impact ◽

Laser Energy ◽

Melting Process ◽

Laser Energy Density ◽

Granular System ◽

Laser Melting ◽

Content Type ◽

Powder Bed

Purpose This paper aims to study numerically the influence of the applied laser energy density and the porosity of the powder bed on the thermal behavior of the melt and the resultant instability of the liquid track. Design/methodology/approach A three-dimensional model was proposed to predict local powder melting process. The model accounts for heat transfer, melting, solidification and evaporation in granular system at particle scale. The proposed model has been proved to be a good approach for the simulation of the laser melting process. Findings The results shows that the applied laser energy density has a significantly influence on the shape of the molten pool and the local thermal properties. The relative low or high input laser energy density has the main negative impact on the stability of the scan track. Decreasing the porosity of the powder bed lowers the heat dissipation in the downward direction, resulting in a shallower melt pool, whereas pushing results in improvement in liquid track quality. Originality/value The randomly packed powder bed is calculated using discrete element method. The powder particle information including particle size distribution and packing density is taken into account in placement of individual particles. The effect of volumetric shrinkage and evaporation is considered in numerical model.

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