TECHNICAL PAPERS: Heat Transfer in Manufacturing

Incandescence Measurement During CO2 Laser Texturing of Silicate Glass

[+] Author and Article Information
Lei Li, Ted D. Bennett

Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106

J. Heat Transfer 123(2), 376-381 (Nov 21, 2000) (6 pages) doi:10.1115/1.1351166 History: Received March 08, 2000; Revised November 21, 2000
Copyright © 2001 by ASME
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Comparison between old and new numerical models: (a) pulse shape of CO2 laser pulse; and (b) temperature dependence of thermal conductivity (left axis) and imaginary refractive index at the wavelength of the laser (right axis)
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Optical microscope image of laser texture bumps on silicate glass
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Experimental setup for visible emission measurements
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Time resolved emission measurements at 550 nm for different pulse energies
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Peak intensity as a function of pulse energy for different wavelengths. Scattered symbols represent experimental data; solid lines show least square fit to data.
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Reciprocal of extensive heat capacity versus emission wavelength. Experimentally determined values are compared with numerically calculated values based on Eq. (6).
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Peak emission temperature as a function of pulse energy for five wavelengths. Panels (a) and (b) show experimental and numerical results, respectively. Error bars show the temperature uncertainty, as derived from the uncertainty in the measured extensive heat capacities reported in Fig. 6.
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Transient temperatures for the corresponding emission curves presented in Fig. 4. Experimental uncertainty is approximately 15 percent of the temperature value.
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Comparison of numerically calculated (solid lines) and experimentally measured (solid circles) emission temperatures. For temporal comparison, hollow squares show experimental results scaled with numerical results. Shaded regions show the temperature uncertainty, as derived from the uncertainty in the measured extensive heat capacities reported in Fig. 6.




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