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AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 - Tomsk, Russia (1–5 October 2019)] PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 - Complex experimental approach to carbon-carbon composite defect detection by laser vibrometry and optical thermography
摘要： Nondestructive testing of carbon-carbon composite plate by thermal method and laser vibrometry with 12 impact damages of the same energy were carried out. Thermograms and distributions of vibrations from the plate surface at its heating and acoustic excitation are obtained. Complex diagnostics made it possible to detect all available defects by synthesizing data, as well as to increase the accuracy and informative value of quality control. It is shown that the control efficiency depends on the side of the plate selected for shooting, the type of method used to process the obtained data in the thermal control, as well as on the choice of the direction of acoustic wave movement when using laser vibrometry.
关键词： laser vibrometry,carbon-carbon composite,optical thermography,nondestructive testing,defect detection
更新于2025-09-16 10:30:52
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Thermal characterization of gallium oxide Schottky barrier diodes
摘要： The higher critical electric field of β-gallium oxide (Ga2O3) gives promise to the development of next generation power electronic devices with improved size, weight, power, and efficiency over current state-of-the-art wide bandgap devices based on 4H-silicon carbide (SiC) and gallium nitride (GaN). However, it is expected that Ga2O3 devices will encounter serious thermal issues due to the poor thermal conductivity of the material. In this work, self-heating in Ga2O3 Schottky barrier diodes under different regimes of the diode operation was investigated using diverse optical thermography techniques including thermoreflectance thermal imaging, micro-Raman thermography, and infrared thermal microscopy. 3D coupled electro-thermal modeling was used to validate experimental results and to understand the mechanism of heat generation for the diode structures. Measured topside and cross-sectional temperature fields suggest that device and circuit engineers should account for the concentrated heat generation that occurs near the anode/Ga2O3 interface and/or the lightly doped drift layer under both forward and high voltage reverse bias conditions. Results of this study suggest that electro-thermal co-design techniques and top-side thermal management solutions are necessary to exploit the full potential of the Ga2O3 material system.
关键词： Schottky barrier diodes,thermal characterization,electro-thermal modeling,gallium oxide,optical thermography
更新于2025-09-10 09:29:36