Mates, S.
(2008),
Schlieren Imaging in Materials Processing, The Masonry Society Journal
(Accessed July 17, 2024)
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Schlieren Imaging in Materials Processing
Published
Author(s)
Abstract
Even before Ernst Mach used it to visualize sock waves cast by a supersonic bullet in 1888, the schlieren optical technique has been a valuable diagnostic tool in fluid mechanics, particularly int he fields of aerodynamics and heat convection, where strong density gradients in the flow are able to produce high-contrast schlieren images. Recent advances in high-speed, high resolution CCD imaging technology have faciliated high quality imaging of dynamic phenomena in materials processing operations that involve compressible fluid flow, such as inert gas atomization of molten metals and thermal spraying of protective coatings. This paper describes the use of three types of schlieren optical arrangements to visualize compressible flow patterns produced in these processes using commercially aailable CCD cameras. Factors affecting schlieren sensitivity and image contrast and quality associated with the choice of optical elements, cutoff filter, light source are discussed, as are issues arising from the operational characteristics of most commercial CCD cameras.Citation
The Masonry Society Journal
Pub Type
Journals
Keywords
Flow Visualization, Materials Processing, Schlieren, Thermal Spray
Citation
Issues
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Created October 16, 2008