Observation of refractive index gradients in a laser-generated plume using laser schlieren imaging

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Description

Understanding the interaction between a pulsed Nd:YAG laser beam and the plume generated above the surface of a workpiece during laser welding is important for process modeling and control. We present a laser schlieren method which can be used to observe this interaction by imaging the refractive index gradient within the plume. The laser schlieren technique uses an expanded, collimated probe laser beam to image a phase object onto a filter with a radial gradient in optical density. The probe beam is focused through the filter and onto the image plane of an intensified high-speed camera, so that the temporal ... continued below

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12 p.

Creation Information

Essien, M.; Keicher, D.M. & Jellison, J.L. December 31, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Understanding the interaction between a pulsed Nd:YAG laser beam and the plume generated above the surface of a workpiece during laser welding is important for process modeling and control. We present a laser schlieren method which can be used to observe this interaction by imaging the refractive index gradient within the plume. The laser schlieren technique uses an expanded, collimated probe laser beam to image a phase object onto a filter with a radial gradient in optical density. The probe beam is focused through the filter and onto the image plane of an intensified high-speed camera, so that the temporal variation of the laser/plume interaction may be observed over the duration of the laser pulse. Qualitative measurements of the spatial distribution of refractive index are presented. The velocity of the vaporized metal forming the plume is also measured for a stainless steel weldment.

Physical Description

12 p.

Notes

OSTI as DE96003694

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  • 14. international congress on applications of lasers and electro-optics, San Diego, CA (United States), 13-16 Nov 1995

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  • Other: DE96003694
  • Report No.: SAND--95-0994C
  • Report No.: CONF-9511146--3
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 171364
  • Archival Resource Key: ark:/67531/metadc673187

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 13, 2016, 4:07 p.m.

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Essien, M.; Keicher, D.M. & Jellison, J.L. Observation of refractive index gradients in a laser-generated plume using laser schlieren imaging, article, December 31, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc673187/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.