A moving line-source laser beam was used to scan the entire surface of a rectangular plate, pursuant to locating defects. The laser generates a point beam of laser energy, which is transformed into a line-heating source using sheet-forming optical components. The heat source is then scanned across the sample by placing the sample in a vertical position on a moving servo table, which moves horizontally at a prescribed speed. A relatively small overall temperature rise of 10° is desired to allow the heat transfer to be modeled mathematically assuming constant thermal properties. A thermal camera was employed for recording the temperature distribution on the nonheated side of the sample. Once a mathematical model or other smoothing technique is fitted to the experimental data, the calculated temperature is subtracted from the measured temperature, and a residual temperature field is created. Additional features of this research include the use of simple spline fits, Bayesian techniques, and the mollification method. The results are provided, which allow for a comparison of the effectiveness of each technique.
Detecting Material Defects Using a Scanning Laser Beam
Journal of Thermophysics and Heat Transfer ; 33 , 1 ; 210-215
2018-10-12
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
APPARATUS FOR NOTIFYING WALK SIGNAL USING LASER BEAM SCANNING
Europäisches Patentamt | 2019
|Method, system and material for detecting objects of high interest with laser scanning systems
Europäisches Patentamt | 2022
|METHOD, SYSTEM AND MATERIAL FOR DETECTING OBJECTS OF HIGH INTEREST WITH LASER SCANNING SYSTEMS
Europäisches Patentamt | 2019
|The Localization of the Defects in Semiconductor Devices Using a New Laser Scanning
British Library Conference Proceedings | 1993
|Emerald Group Publishing | 2001